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? 2016 microchip technology inc. ds00002199a-page 1 features ? single-chip 10base-t/1 00base-tx ieee 802.3 compliant ethernet transceiver ? rmii v1.2 interface support with a 50 mhz refer- ence clock output to mac, and an option to input a 50 mhz reference clock ? rmii back-to-back mode support for a 100 mbps copper repeater ? mdc/mdio management interface for phy reg- ister configuration ? programmable interrupt output ? led outputs for link and activity status indica- tion ? on-chip termination resistors for the differential pairs ? baseline wander correction ? hp auto mdi/mdi-x to reliably detect and cor- rect straight-through and crossover cable con- nections with disable and enable option ? auto-negotiation to automatically select the highest link-up speed (10/100 mbps) and duplex (half/full) ? power-down and power-saving modes ? linkmd ? tdr-based cable diagnostics to iden- tify faulty copper cabling ? parametric nand tree support for fault detec- tion between chip i/os and the board ? hbm esd rating (6 kv) ? loopback modes for diagnostics ? single 3.3v power supply with v dd i/o options for 1.8v, 2.5v, or 3.3v ? built-in 1.2v regulator for core ? available in 24-pin 4 mm x 4 mm qfn package target applications ? game consoles ? ip phones ? ip set-top boxes ?ip tvs ?lom ? printers ksz8081rna/rnd 10base-t/100base-tx phy with rmii support
ksz8081rna/rnd ds00002199a-page 2 ? 2016 microchip technology inc. to our valued customers it is our intention to provide our valued customers with the bes t documentation possible to ensure successful use of your micro chip products. to this end, we will continue to improve our publications to better suit your needs. our publications will be refined and enhanced as new volumes and updates are introduced. if you have any questions or comments regarding this publication, please contact the marketing co mmunications department via e-mail at docerrors@microchip.com . we welcome your feedback. most current data sheet to obtain the most up-to-date version of this data s heet, please register at our worldwide web site at: http://www.microchip.com you can determine the version of a data s heet by examining its literature number found on the bottom outside corner of any page . the last character of the literature number is the versi on number, (e.g., ds30000000a is version a of document ds30000000). errata an errata sheet, describing minor operati onal differences from the data sheet and recommended workarounds, may exist for cur- rent devices. as device/doc umentation issues become known to us, we will publish an errata s heet. the errata will specify the revision of silicon and revision of document to which it applies. to determine if an errata sheet exis ts for a particular device, please check with one of the following: ? microchip?s worldwide web site; http://www.microchip.com ? your local microchip sales office (see last page) when contacting a sales office, please spec ify which device, revision of silicon and data sheet (include -literature number) yo u are using. customer notification system register on our web site at www.microchip.com to receive the most current information on all of our products.
? 2016 microchip technology inc. ds00002199a-page 3 ksz8081rna/rnd table of contents 1.0 introduction .............................................................................................................. ....................................................................... 4 2.0 pin description and configuration ......................................................................................... ......................................................... 5 3.0 functional description .................................................................................................... .............................................................. 10 4.0 register descriptions ..................................................................................................... ............................................................... 26 5.0 operational charac teristics ............................................................................................... ............................................................ 35 6.0 electrical characteristics ................................................................................................ ............................................................... 36 7.0 timing diagrams ............................................................................................................ ................................................................ 38 8.0 reset circuit .............................................................................................................. .................................................................... 42 9.0 reference circuits - led strap-in pins ..................................................................................... .................................................... 43 10.0 reference clock - connection and selection ................................................................................ .............................................. 44 11.0 magnetic - connection and selection ....................................................................................... ................................................... 45 12.0 package outlines .......................................................................................................... ............................................................... 47 appendix a: data sheet revision history ....................................................................................... .................................................... 48 the microchip web site ........................................................................................................ .............................................................. 49 customer change notification service .......................................................................................... ..................................................... 49 customer support .............................................................................................................. ................................................................. 49 product identification system ................................................................................................. ............................................................ 50
ksz8081rna/rnd ds00002199a-page 4 ? 2016 microchip technology inc. 1.0 introduction 1.1 general description the ksz8081rna/rnd is a single-supply 10base-t/100base-tx ethernet physical-layer transceiver for transmis- sion and reception of data over standard cat-5 unshielded twisted pair (utp) cable. the ksz8081rna/rnd is a highly-in tegrated phy solution. it reduces board co st and simplifies board layout by using on-chip termination resistors for the differential pairs and by integrating a low-noise regulator to supply the 1.2v core, and by offering 1.8/2.5/3.3v digital i/o interface support. the ksz8081rna/rnd offers the reduced media independent inte rface (rmii) for direct connection to rmii-compliant macs in ethernet processors and switches. as the power-up default, the ksz8081rna/rnd uses a 25 mh z crystal to generate all required clocks, including the 50 mhz rmii reference clock output for the mac. the ksz808 1rnd is the version that takes in the 50 mhz rmii ref- erence clock as the power-up default. to facilitate system bring-up and debugging in production te sting and in product deployment, parametric nand tree sup- port enables fault detection between ksz8081rna/rnd i/os and the board. linkmd ? tdr-based cable diagnostics identify faulty copper cabling. the ksz8081rna and KSZ8081RND are available in 24-pin, lead-free qfn packages. figure 1-1: system block diagram ksz8081rna magnetics rj-45 connector media types: 10base-t 100base-tx on-chip termination resistors rmii mdc/mdio management xo xi 25mhz xtal 22pf 22pf 10/100mbps rmii mac 50mhz ref_clk
? 2016 microchip technology inc. ds00002199a-page 5 ksz8081rna/rnd 2.0 pin description and configuration figure 2-1: 24-qfn pin assignment (top view) 1 2 3 4 5 6 18 17 16 15 14 13 24 23 22 21 20 19 7 8 9 10 11 12 paddle ground (on bottom of chip) vdd_1.2 vdda_3.3 rxm rxp txm txp intrp rxer ref_clk crs_dv/ phyad[1:0] vddio rxd0 rst# led0 / anen_speed gnd txd1 txd0 txen xo xi rext mdio mdc rxd1
ksz8081rna/rnd ds00002199a-page 6 ? 2016 microchip technology inc. table 2-1: signals - ksz8081rna/rnd pin number pin name type note 2-1 description 1 vdd_1.2 p 1.2v core v dd (power supplied by ksz8081rna/KSZ8081RND). decouple with 2.2 f and 0.1 f capacitors to ground. 2 vdda_3.3 p 3.3v analog v dd . 3rxmi/o physical receive or transmit signal (? differential). 4rxpi/o physical receive or transmit signal (+ differential). 5txmi/o physical transmit or receive signal (? differential). 6txpi/o physical transmit or receive signal (+ differential). 7xoo crystal feedback for 25 mhz crystal. this pin is a no connect if an oscillator or external clock source is used. 8xii rmii ? 25 mhz mode: 25 mhz 50 ppm crystal/oscillator/external clock input rmii ? 50 mhz mode: 50 mhz 50 ppm oscillator/external clock input for unmanaged mode (power-up default setting): ? ksz8081rna takes in the 25 mhz crystal/clock on this pin. ? KSZ8081RND takes in the 50 mhz clock on this pin. after power-up, both the ksz8081rna and KSZ8081RND can be pro- grammed to either the 25 mhz mode or 50 mhz mode using phy register 1fh bit [7]. see also ref_clk (pin 16). 9 rext i set phy transmit output current. connect a 6.49 k ? resistor to ground on this pin. 10 mdio ipu/ opu management interface (mii) data i/o. this pin has a weak pull-up, is open- drain, and requires an external 1.0 k ? pull-up resistor. 11 mdc ipu management interface (mii) clock input. this clock pin is synchronous to the mdio data pin. 12 rxd1 ipd/o rmii receive data output[1] ( note 2-2 ). 13 rxd0 ipu/o rmii receive data output[0] ( note 2-2 ). 14 vddio p 3.3v, 2.5v, or 1.8v digital v dd . 15 crs_dv/ phyad[1:0] ipd/o rmii mode: carrier sense/receive data valid output. config. mode: the pull-up/pull-down val ue is latched as phyad[1:0] at the de-assertion of reset. see the strapping options section for details.
? 2016 microchip technology inc. ds00002199a-page 7 ksz8081rna/rnd 16 ref_clk ipd/o rmii ? 25 mhz mode: this pin provides the 50 mhz rmii reference clock out- put to the mac. rmii ? 50 mhz mode: this pin is a no connect. for unmanaged mode (power-up default setting), ? ksz8081rna is in rmii ? 25 mhz mode and outputs the 50 mhz rmii ref- erence clock on this pin. ? KSZ8081RND is in rmii ? 50 mhz mode and does not use this pin. after power-up, both ksz8081rna and KSZ8081RND can be programmed to either 25 mhz mode or 50 mhz mode using phy register 1fh bit [7]. see also xi (pin 8). 17 rxer ipd/o rmii receive error output. at the de-assertion of reset, this pin needs to latch in a pull-down value for normal operation. if mac side pulls this pin high, see register 16h, bit [15] for solution. it is better having an external pull-down resistor to avoid mac side pulls this pin high. 18 intrp ipu/ opu interrupt output: programm able interrupt output. this pin has a weak pull-up, is open drain, and requires an external 1.0 k ? pull-up resistor. 19 txen i rmii transmit enable input. 20 txd0 i rmii transmit data input [0] ( note 2-3 ). 21 txd1 i/o rmii transmit data input [1] ( note 2-3 ). nand tree mode: nand tree output pin. 22 gnd gnd ground. 23 led0/ anen_speed ipu/o led output: programmable led0 output. config. mode: latched as auto-negotiat ion enable (register 0h, bit [12]) and speed (register 0h, bit [13]) at the de-assertion of reset. see the strapping options section for details. the led0 pin is programmable using register 1fh bits [5:4], and is defined as follows: led mode = [00] link/activity pin state led definition no link high off link low on activity toggle blinking led mode = [01] link pin state led definition no link high off link low on led mode = [10], [11] : reserved 24 rst# ipu chip reset (active-low). table 2-1: signals - ksz8081rna/rnd (continued) pin number pin name type note 2-1 description
ksz8081rna/rnd ds00002199a-page 8 ? 2016 microchip technology inc. note 2-1 p = power supply gnd = ground i = input o = output i/o = bi-directional ipu = input with internal pull-up (see section 6.0, "electrical characteristics" for value). ipu/o = input with in ternal pull-up (see section 6.0, "electrical characteristics" for value) during power-up/reset; out put pin otherwise. ipd/o = input with internal pull-down (see electric al characteristics for value) during power-up/reset; output pin otherwise. ipu/opu = input with internal pull-up (see electrical characteristics for value) and output with internal pull-up (see electrical characteristics for value). note 2-2 rmii rx mode: the rxd[1:0] bits are synchronous with the 50 mhz rmii reference clock. for each clock period in which crs_dv is asserted, two bits of recovered data are sent by the phy to the mac. note 2-3 rmii tx mode: the txd[ 1:0] bits are synchronous with the 50 mhz rmii reference clock. for each clock period in which txen is asserted, two bits of data are received by the phy from the mac. paddle gnd gnd ground. table 2-1: signals - ksz8081rna/rnd (continued) pin number pin name type note 2-1 description
? 2016 microchip technology inc. ds00002199a-page 9 ksz8081rna/rnd the phyad[1:0] strap-in pin is latched at th e de-assertion of reset. in some syst ems, the rmii mac receive input pins may drive high/low during power-up or reset, and consequently cause the phyad[1:0] strap-in pin, a shared pin with the rmii crs_dv signal, to be latched to the unintended hi gh/low state. in this case an external pull-up (4.7 k ? ) or pull- down (1.0 k ? ) should be added on the phyad[1:0] strap-in pin to ensure that the intended val ue is strapped-in correctly. note 2-4 ipu/o = input with internal pull-up (see electrical characteristics for value) during power-up/reset; output pin otherwise. ipd/o = input with internal pull-down (see electric al characteristics for value) during power-up/reset; output pin otherwise. table 2-2: strap-in options - ksz8081rna/rnd pin number pin name type note 2-4 description 15 phyad[1:0] ipd/o the phy address is latched at the de-assertion of reset and is con- figurable to either one of the following two values: pull-up = phy address is set to 00011b (0x3h) pull-down (default) = phy address is set to 00000b (0x0h) phy address bits [4:2] are set to 000 by default. 23 anen_speed ipu/o auto-negotiation enable and speed mode pull-up (default) = enable auto-negotiation and set 100 mbps speed pull-down = disable auto-negotiation and set 10 mbps speed at the de-assertion of reset, this pi n value is latched into register 0h bit [12] for auto-negotiation enable/ disable, register 0h bit [13] for the speed select, and register 4h (auto-negotiation advertisement) for the speed capability support.
ksz8081rna/rnd ds00002199a-page 10 ? 2016 microchip technology inc. 3.0 functional description the ksz8081rna is an integrated, single 3. 3v supply, fast ethernet transceiver. it is fully compliant with the ieee 802.3 specification, and reduces board cost and simplifies board layout by usin g on-chip termination resistors for the two dif- ferential pairs and by integrating the regulator to supply the 1.2v core. on the copper media side, the ksz8081rna supports 10base-t and 100base-tx for transmission and reception of data over a standard cat-5 unshielded twisted pair (utp) cabl e, and hp auto mdi/mdi-x for reliable detection of and correction for straight-through and crossover cables. on the mac processor side, the ksz8081rna offers the re duced media independent interf ace (rmii) for direct con- nection with rmii-compliant ethernet mac processors and switches the mii management bus option gives the mac processo r complete access to the ksz8081rna control and status registers. additionally, an interrupt pin eliminates t he need for the processor to poll for phy status change. as the power-up default, the ksz8081rna uses a 25 mhz crystal to generate all required clocks, including the 50 mhz rmii reference clock output for the mac. the KSZ8081RND version uses t he 50 mhz rmii reference clock as the power-up default. the ksz8081rna/rnd is used to refer to both ksz 8081rna and KSZ8081RND versions in this data sheet. 3.1 10base-t/100base-tx transceiver 3.1.1 100base-tx transmit the 100base-tx transmit function performs parallel-to-s erial conversion, 4b/5b encoding, scrambling, nrz-to-nrzi conversion, and mlt3 encoding and transmission. the circuitry starts with a parallel-to-serial conversion, wh ich converts the mii data from the mac into a 125 mhz serial bit stream. the data and control stream is then converted into 4b/5b coding and followed by a scrambler. the serialized data is further converted from nrz-to- nrzi format, and then transmitted in mlt3 current output. the output current is set by an external 6.49 k ? 1% resistor for the 1:1 transformer ratio. the output signal has a typical rise/fall time of 4 ns and complies with the ansi tp-pmd standard regarding amplitude balance, overshoot, an d timing jitter. the wave-shaped 10base-t output is also inco rporated into the 100base-tx transmitter. 3.1.2 100base-tx receive the 100base-tx receiver function perfor ms adaptive equalizat ion, dc restoration, mlt3-t o-nrzi conversion, data and clock recovery, nrzi-to-nrz conversion, de-scrambling, 4b/5b decoding, and serial-to-parallel conversion. the receiving side starts with the equalization filter to com pensate for inter-symbol interfer ence (isi) over the twisted pair cable. because the amplitude loss a nd phase distortion is a function of the cable length, the equa lizer must adjust its characteristics to optimize performanc e. in this design, the variable equalizer makes an initial estimation based on comparisons of incoming signal strength against some know n cable characteristics, then tunes itself for optimization. this is an ongoing process and self-adjusts against environmental changes such as temperature variations. next, the equalized signal goes through a dc-restoration and data-conversion block. the dc-restoration circuit com- pensates for the effect of baseline wander and improves the dynamic range. the differential data-conversion circuit con- verts mlt3 format back to nrzi. the slicing threshold is also adaptive. the clock-recovery circuit extracts the 125 mhz clock from the edges of the nrzi signal. this recovered clock is then used to convert the nrzi signal to nrz format. this signal is sent through the de-scrambl er, then the 4b/5b decoder. finally, the nrz serial data is converted to mii format and provided as the input data to the mac. 3.1.3 scrambler/de-scrambler (100base-tx only) the scrambler spreads the power spectrum of the transmitted signal to reduce electromagnetic interference (emi) and baseline wander. the de-scrambler recovers the scrambled signal. 3.1.4 10base-t transmit the 10base-t drivers are incorporated with the 100base-tx dr ivers to allow for transmission using the same mag- netic. the drivers perform internal wa ve-shaping and pre-emphasis, and output 10base-t signa ls with typical ampli- tude of 2.5v peak. the 10base-t signa ls have harmonic contents that are at least 27 db below the fundamental frequency when driven by an all-ones manchester-encoded signal.
? 2016 microchip technology inc. ds00002199a-page 11 ksz8081rna/rnd 3.1.5 10base-t receive on the receive side, input buffer and level detecting squelch ci rcuits are used. a differential input receiver circuit and a phase-locked loop (pll) performs the decoding function. t he manchester-encoded data stream is separated into clock signal and nrz data. a squelch circuit rejects signals with levels less than 400 mv, or with short pulse widths, to prevent noise at the rxp and rxm inputs from falsely triggering t he decoder. when the input exce eds the squelch limit, the pll locks onto the incoming signal and the ksz8081rna/rnd decode s a data frame. the receive clock is kept active during idle periods between data receptions. 3.1.6 pll clock synthesizer the ksz8081rna/r nd in rmii ? 25 mhz clock mode ge nerates all internal clocks and all exter nal clocks for system timing from an external 25 mhz crysta l, oscillator, or reference clock. for the ksz8081rna/rnd in rmii ? 50 mhz clock mode, these clocks are generated from an external 50 mhz oscillator or system clock. 3.1.7 auto-negotiation the ksz8081rna/rnd conforms to the au to-negotiation protocol, defined in cla use 28 of the ieee 802.3 specifica- tion. auto-negotiation allows unshielded twisted pair (utp) link partners to select the highest common mode of operation. during auto-negotiation, link partners advertise capabilities across the utp link to each other and then compare their own capabilities with those they received from their link partners. the highest speed and duplex setting that is common to the two link partners is selected as the mode of operation. the following list shows the speed and duplex opera tion mode from highest to lowest priority. ? priority 1: 100base-tx, full-duplex ? priority 2: 100base-tx, half-duplex ? priority 3: 10base-t, full-duplex ? priority 4: 10base-t, half-duplex if auto-negotiation is not sup ported or the ksz8081rna/rnd link partner is fo rced to bypass auto-negotiation, then the ksz8081rna/rnd sets its operating mode by observing the si gnal at its receiver. this is known as parallel detection, which allows the ksz8081rna/rnd to establish a link by list ening for a fixed signal protocol in the absence of the auto- negotiation advertisement protocol. auto-negotiation is enabled by either hardware pin strapping (anen_speed, pin 23) or softwa re (register 0h , bit [12]). by default, auto-negotiation is enabled after power-up or har dware reset. after that, auto-negotiation can be enabled or disabled by register 0h, bit [12]. if auto-negotiation is disa bled, the speed is set by register 0h, bit [13], and the duplex is set by register 0h, bit [8]. the auto-negotiation link-up process is shown in figure 3-1 .
ksz8081rna/rnd ds00002199a-page 12 ? 2016 microchip technology inc. figure 3-1: auto-ne gotiation flow chart 3.2 rmii interface the reduced media independent interface (rmii) specifies a low pin count me dia independent interface (mii). it pro- vides a common interface between physical layer and mac layer devices, and has the following key characteristics: ? pin count is 8 pins (3 pins for data transmission, 4 pi ns for data reception, and 1 pin for the 50 mhz reference clock). ? 10 mbps and 100 mbps data rates are supported at both half- and full-duplex. ? data transmission and reception are independent and belong to separate signal groups. ? transmit data and receive data are each 2 bits wide, a dibit. 3.2.1 rmii signal definition table 3-1 describes the rmii signals. refer to rmii specification v1.2 for detailed information. start auto-negotiation force link setting listen for 10base-t link pulses listen for 100base-tx idles attempt auto- negotiation link mode set bypass auto- negotiation and set link mode link mode set? parallel operation no yes yes no join flow
? 2016 microchip technology inc. ds00002199a-page 13 ksz8081rna/rnd 3.2.1.1 reference clock (ref_clk) ref_clk is a continuous 50 mhz clock that provides the timing reference for txen, txd[1:0], crs_dv, rxd[1:0], and rx_er. for rmii ? 25 mhz clock mode, the ksz8081rna/rnd generates and outputs the 50 mhz rmii ref_clk to the mac at ref_clk (pin 16). for rmii ? 50 mhz clock mode, the ksz8081rna/rnd takes in the 50 mhz rmii ref_clk from the mac or system board at xi (pin 8) and leaves the ref_clk (pin 16) as no connect. 3.2.1.2 transmit enable (txen) txen indicates that the mac is presenting dibits on txd[1:0] for transmission. it is asserted synchronou sly with the first dibit of the preamble and remains asserted while all dibits to be transmitted are presen ted on the rmii. it is negated before the first ref_clk followin g the final dibit of a frame. txen transitions synchronousl y with respect to ref_clk. 3.2.1.3 transmit data[1:0] (txd[1:0]) txd[1:0] transitions synchronously with respect to ref_clk. when txen is asserted, the phy accepts txd[1:0] for transmission. txd[1:0] is 00 to indicate idle when txen is de-asserted. the phy ignores va lues other than 00 on txd[1:0] while txen is de-asserted. 3.2.1.4 carrier sense/receive data valid (crs_dv) the phy asserts crs_dv when the receive medium is non-idle. it is asserted asynchronously when a carrier is detected. this happens when squelch is passed in 10 mbps mode, and w hen two non-contiguous 0s in 10 bits are detected in 100 mbps mode. loss of carrier results in the de-assertion of crs_dv. while carrier detection criteria are met, crs_dv remains asse rted continuously from the first recovered dibit of the frame through the final recovered dibit. it is negated before the first ref_clk th at follows the final dibit. the data on rxd[1:0] is considered valid after crs_dv is asserted. ho wever, because the assertion of crs_dv is asynchronous relative to ref_clk, the data on rxd[1:0] is 00 until receive signals are properly decoded. 3.2.1.5 receive data[1:0] (rxd[1:0]) rxd[1:0] transitions synchronously with respect to ref_ clk. for each clock period in which crs_dv is asserted, rxd[1:0] transfers two bits of recovered data from the phy. rxd[1:0] is 00 to indicate idle when crs_dv is de-assert ed. the mac ignores values other than 00 on rxd[1:0] while crs_dv is de-asserted. table 3-1: rmii si gnal definition rmii signal name direction with respect to phy, ksz8081 signal direction with respect to mac description ref_clk output (25 mhz clock mode)/ no connect (50 mhz clock mode) input/ input or no connect synchronous 50 mhz reference clock for receive, trans- mit, and control interface txen input output transmit enable txd[1:0] input output transmit data[1:0] crs_dv output input carrier sense/receive data valid rxd[1:0] output input receive data[1:0] rxer output input or not required receive error
ksz8081rna/rnd ds00002199a-page 14 ? 2016 microchip technology inc. 3.2.1.6 receive error (rxer) rxer is asserted for one or more ref_clk periods to indica te that a symbol error (for ex ample, a coding error that a phy can detect that may ot herwise be undetectable by th e mac sub-layer) was detected somewhere in the frame being transferred from the phy. rxer transitions synchronously with resp ect to ref_clk. while crs_dv is de-a sserted, rxer has no effect on the mac. 3.2.1.7 collision detection (col) the mac regenerates the col signal of the mii from txen and crs_dv. 3.2.2 rmii signal diagram ? 25/50 mhz clock mode the ksz8081rna/rnd rmii pin c onnections to the mac for 25 mhz clock mode are shown in figure 3-2 . the con- nections for 50 mhz clock mode are shown in figure 3-3 . 3.2.2.1 rmii ? 25 mhz clock mode the ksz8081rna is configured to rmii ? 25 mhz clock mode afte r it is powered up or hardware reset with the following: ? a 25 mhz crystal connected to xi, xo (pins 8, 7), or an external 25 mhz clock source (oscillator) connected to xi the KSZ8081RND can optionally be configured to rmii ? 25 mhz cl ock mode after it is powered up or hardware reset and software programmed with the following: ? a 25 mhz crystal connected to xi, xo (pins 8, 7), or an external 25 mhz clock source (oscillator) connected to xi ? register 1fh, bit [7] programmed to ?1? to select rmii ? 25 mhz clock mode figure 3-2: ksz8081rna/ rnd rmii interface (rmii - 25 mhz clock mode) ' ksz8081rna/rnd crs_dv rxd[1:0] rxer txd[1:0] rmii mac crs_dv rxd[1:0] txd[1:0] rx_er ref_clk txen tx_en xi ref_clk xo 25mhz xtal 22pf 22pf
? 2016 microchip technology inc. ds00002199a-page 15 ksz8081rna/rnd 3.2.2.2 rmii ? 50 mhz clock mode the KSZ8081RND is configured to rmii ? 50 mhz clock mode af ter it is powered up or hardware reset with the follow- ing: ? an external 50 mhz clock source (oscillator) connected to xi (pin 8) the ksz8081rna can optionally be configured to rmii ? 50 mhz clock mode after it is powered up or hardware reset and software programmed with the following: ? an external 50 mhz clock source (oscillator) connected to xi (pin 8) ? register 1fh, bit [7] programmed to ?1? to select rmii ? 50 mhz clock mode figure 3-3: ksz8081rna/rnd rmii inte rface (rmii - 50 mhz clock mode) ksz8081rna/rnd crs_dv rxd[1:0] rxer txd[1:0] rmii mac crs_dv rxd[1:0] txd[1:0] rx_er ref_clk txen tx_en xi 50mhz osc
ksz8081rna/rnd ds00002199a-page 16 ? 2016 microchip technology inc. 3.3 back-to-back mode ? 100 mbps copper repeater two ksz8081rna/rnd devices can be connected back-to-ba ck to form a managed 100base-tx copper repeater. 3.3.1 rmii back-to-back mode in rmii back-to-back mode, a ksz8081 rna/rnd interfaces with another ksz8081rna/rnd to provide a 100 mbps copper repeater solution. the ksz8081rna/rnd devices are configured to rmii back-to -back mode after power-up or reset, and software pro- gramming, with the following: ? a common 50 mhz reference cl ock connected to xi (pin 8) ? register 1fh, bit [7] programmed to ?1? to select rmii ? 50 mhz clock mode for ksz8081rna KSZ8081RND is set to rmii ? 50 mhz clock mode as the default after power up or hardware reset. ? register 16h, bits [6] and [1] programmed to ?1? an d ?1?, respectively, to enable rmii back-to-back mode. ? rmii signals connected as shown in table 3-2 . figure 3-4: ksz8081rna/rnd and ksz8 081rna/rnd rmii back-to-back copper repeater table 3-2: rmii signal connection fo r rmii back-to-back mode (100base-tx copper repeater) ksz8081rna/rnd (100base-tx copper) [device 1] ksz8081rna/rnd (100 base-tx copper) [device 2] pin name pin number pin type pin name pin number pin type crs_dv 15 output txen 19 input rxd1 12 output txd1 21 input rxd0 13 output txd0 20 input txen 19 input crs_dv 15 output txd1 21 input rxd1 12 output txd0 20 input rxd0 13 output ksz8081rna/rnd (copper mode) rxp/rxm txp/txm rxd txd rxd txd osc xi xi 50mhz txp/txm rxp/rxm (copper mode) ksz8081rna/rnd
? 2016 microchip technology inc. ds00002199a-page 17 ksz8081rna/rnd 3.4 mii management (miim) interface the ksz8081rna/rnd supports the ieee 802.3 mii manageme nt interface, also known as the management data input/output (mdio) interface. this interface allows an uppe r-layer device, such as a ma c processor, to monitor and control the state of the ksz8081rna/rnd. an external device with miim capability is used to read the phy status and/ or configure the phy settings. more de tails about the miim interface can be found in clause 22.2.4 of the ieee 802.3 specification. the miim interface consists of the following: ? a physical connection that incorporates th e clock line (mdc) and the data line (mdio). ? a specific protocol that o perates across the physical connection mentioned earlier, which allows the external con- troller to communicate with one or more phy devices. ? a set of 16-bit mdio registers. registers [0:8] are st andard registers, and their func tions are defined in the ieee 802.3 specification. the additional regi sters are provided for expanded functionality. see the register map section for details. the ksz8081rna/rnd supports only two unique phy addresses. the phyad[1:0] strappi ng pin is used to select either 0h or 3h as the unique phy address for the ksz8081rna/rnd device. phy address 0h is defined as the broadcast phy address a ccording to the ieee 802.3 specification, and can be used to read/write to a single phy device, or write to multiple phy devices simultaneously. for the ksz8081rna/rnd, phy address 0h defaults to the broadcast phy address after powe r-up, but phy address 0h can be disabled as the broad- cast phy address using software to assign it as a unique phy address. for applications that require two ksz 8081rna/rnd phys to share the same mdio interface with one phy set to address 0h and the other phy set to address 3h, use phy addre ss 0h (defaults to broadcast after power-up) to set both phys? register 16h, bit [9] to ?1? to assign phy address 0h as a unique (non-broadcast) phy address. table 3-3 shows the mii management fr ame format for the ksz8081rna/rnd. 3.5 interrupt (intrp) intrp (pin 18) is an optional interrupt sign al that is used to inform the external controller that there has been a status update to the ksz8081rna/rnd phy register. bits [15:8] of r egister 1bh are the interrupt control bits to enable and disable the conditions for asserting the intrp signal. bits [7:0 ] of register 1bh are the interrupt status bits to indicate which interrupt conditions have occurred. the interrupt status bits are cleared after reading register 1bh. bit [9] of register 1fh sets the interrupt level to active high or active low. the default is active low. the mii management bus option gives the mac processor complete access to the ksz8081rna/rnd control and sta- tus registers. additionally, an interrupt pin eliminates th e need for the processor to poll the phy for status change. 3.6 hp auto mdi/mdi-x hp auto mdi/mdi-x configuration elimi nates the need to decide whether to use a straight cable or a crossover cable between the ksz8081rna/rnd and its link partner. this fe ature allows the ksz8081rna/ rnd to use either type of cable to connect with a link partner that is in either mdi or mdi-x mode. the auto-sense function detects transmit and receive pairs from the link partner and assigns transm it and receive pairs to the ksz8081rna/rnd accordingly. hp auto mdi/mdi-x is enabled by default. it is disabled by writing a ?1? to register 1fh, bit [13]. mdi and mdi-x mode is selected by register 1fh, bit [14] if hp auto mdi/mdi-x is disabled. an isolation transformer with symmetrical transmit and rece ive data paths is recommended to support auto mdi/mdi-x. table 3-4 shows how the ieee 802.3 standard defines mdi and mdi-x. table 3-3: mii management frame format for th e ksz8081rna/rnd preamble start of frame read/ write op code phy address bits[4:0] reg address bits[4:0] ta data bits[15:0] idle read 32 1?s 01 10 000aa rrrrr z0 dddddddd_dddddddd z write 32 1?s 01 01 000aa rrrrr 10 dddddddd_dddddddd z
ksz8081rna/rnd ds00002199a-page 18 ? 2016 microchip technology inc. 3.6.1 straight cable a straight cable connects an mdi device to an mdi-x device, or an mdi-x device to an mdi device. figure 3-5 shows a typical straight cable connection between a nic card (mdi device) and a switch or hub (mdi-x device). 3.6.2 crossover cable a crossover cable connects an mdi device to another mdi device, or an mdi-x device to another mdi-x device. figure 3-6 shows a typical crossover cable connection between two switches or hubs (two mdi-x devices). table 3-4: mdi/mdi-x pin description mdi mdi-x rj-45 pin signal rj-45 pin signal 1 tx+ 1 rx+ 2tx?2rx? 3 rx+ 3 tx+ 6 rx? 6 tx? figure 3-5: typical straight cable connection receive pair transmit pair receive pair 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 transmit pair modular connector (rj-45) nic straight cable 10/100 ethernet media dependent interface 10/100 ethernet media dependent interface modular connector (rj-45) hub (repeater or switch)
? 2016 microchip technology inc. ds00002199a-page 19 ksz8081rna/rnd 3.7 loopback mode the ksz8081rna/rnd supports the following loopback oper ations to verify analog and/or digital data paths. ? local (digital) loopback ? remote (analog) loopback 3.7.1 local (dig ital) loopback this loopback mode checks the rmii transmit and rece ive data paths between the ksz8081rna/rnd and the external mac, and is supported for both speeds (10/100 mbps) at full-duplex. the loopback data path is shown in figure 3-7 . 1. the rmii mac transmits frames to the ksz8081rna/rnd. 2. frames are wrapped around inside the ksz8081rna/rnd. 3. the ksz8081rna/rnd transmits frames back to the rmii mac. 4. except the frames back to the rmii mac, the tr ansmit frames also go out from the copper port. figure 3-6: typical crossover cable connection figure 3-7: local (digital) loopback receive pair receive pair transmit pair 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 transmit pair 10/100 ethernet media dependent interface 10/100 ethernet media dependent interface modular connector (rj-45) hub (repeater or switch) crossover cable modular connector (rj-45) hub (repeater or switch) rmii mac rmii pcs (digital) afe (analog) ksz8081rna/rnd
ksz8081rna/rnd ds00002199a-page 20 ? 2016 microchip technology inc. the following programming action and register settings are used for local loopback mode: for 10/100 mbps loopback: set register 0h, bit [14] = 1 // enable local loopback mode bit [13] = 0/1 // select 10 mbps/100 mbps speed bit [12] = 0 // disable auto-negotiation bit [8] = 1 // select full-duplex mode follow the steps below if you don?t want the frames go out from the copper port in the local loopback. 1. set register 1fh bit [3] to ?1? to disable the transmitter. 2. run local loopback test as above. 3. set register 1fh bit [3] to ?0? to enable the transmitter. 3.7.2 remote (analog) loopback this loopback mode checks the line (differential pairs, tran sformer, rj-45 connector, et hernet cable) transmit and receive data paths between the ksz8081 rna/rnd and its link partne r, and is supported fo r 100base-tx full-duplex mode only. the loopback data path is shown in figure 3-8 . 1. the fast ethernet (1 00base-tx) phy link partner transmit s frames to the ksz8081rna/rnd. 2. frames are wrapped around inside the ksz8081rna/rnd. 3. the ksz8081rna/rnd transmits frames back to the fast ethernet (100ba se-tx) phy link partner. the following programming steps and register settings are used for remote loopback mode: 1. set register 0h, bits [13] = 1 // select 100mbps speed bit [12] = 0 // disable auto-negotiation bit [8] = 1 // select full-duplex mode or just auto-negotiate and li nk up at 100base-tx full-duplex mode with the link partner. 2. set register 1fh, bit [2] = 1 // enable remote loopback mode figure 3-8: remote (analog) loopback rj-45 rj-45 cat-5 (utp) ksz8081rna/rnd 100base-tx link partner afe (analog) pcs (digital) rmii
? 2016 microchip technology inc. ds00002199a-page 21 ksz8081rna/rnd 3.8 linkmd ? cable diagnostic the linkmd function uses time-domain reflectometry (tdr) to analyze the cabling plant for common cabling problems. these include open circuits, short circuits, and impedance mismatches. linkmd works by sending a pulse of known amplitude and duration down the mdi or mdi-x pair, then analyzing the shape of the reflected signal to determine the type of fault. the time duration for the reflected signal to return provides the approximate distance to the cabling fault. the linkmd function processes this tdr information and presents it as a numerical value that can be translated to a cable distance. linkmd is initiated by accessing register 1dh, the linkmd c ontrol/status register, in conjun ction with register 1fh, the phy control 2 register. the latter register is used to disable auto mdi/mdi-x and to select either mdi or mdi-x as the cable differential pair for testing. 3.8.1 usage the following is a sample procedure for using linkmd with registers 1dh and 1fh: 1. disable auto mdi/mdi-x by writing a ?1? to register 1fh, bit [13]. 2. start cable diagnostic test by writing a ?1? to regist er 1dh, bit [15]. this enable bit is self-clearing. 3. wait (poll) for register 1dh, bit [15] to return a ?0?, and indicating cable diagnostic test is completed. 4. read cable diagnostic test results in register 1dh, bits [14:13]. the results are as follows: 00 = normal condition (valid test) 01 = open condition detected in cable (valid test) 10 = short condition detected in cable (valid test) 11 = cable diagnostic test failed (invalid test) the ?11? case, invalid test, occurs when the device is unable to shut down the link partner. in this instance, the test is not run, since it would be impossible for the device to determi ne if the detected signal is a reflection of the signal gen- erated or a signal from another source. 5. get distance to fault by concatenati ng register 1dh, bits [8:0] and multiplying the result by a constant of 0.38. the distance to the cable fault can be determined by the following formula: equation 3-1: concatenated value of registers 1dh bits [8:0] shoul d be converted to decimal before multiplying by 0.38. the constant (0.38) may be calibrated for different cabling conditions, including cables with a velocity of propagation that varies significantly from the norm. 3.9 nand tree support the ksz8081rna/rnd provides parametric nand tree support for fault detection between chip i/os and board. the nand tree is a chain of nested nand gates in which each ksz8081rna/rnd digital i/o (nand tree input) pin is an input to one nand gate along the chain. at the end of the chain, the txd1 pi n provides the output for the nested nand gates. the nand tree test process includes: ? enabling nand tree mode ? pulling all nand tree input pins high ? driving each nand tree input pin low, sequentially, according to the nand tree pin order ? checking the nand tree output to make sure there is a toggle high-to-low or low-to-high for each nand tree input driven low table 3-5 lists the nand tree pin order. ddis ce tan to cable fault in meters ?? 0.38 register 1dh, bits[8:0] ?? ? =
ksz8081rna/rnd ds00002199a-page 22 ? 2016 microchip technology inc. 3.9.1 nand tree i/o testing use the following procedure to check for faults on the ks z8081rna/rnd digital i/o pin connections to the board: 1. enable nand tree mode by setting register 16h, bit [5] to ?1?. 2. use board logic to drive all ksz808 1rna/rnd nand tree input pins high. 3. use board logic to drive each nand tree input pi n, in ksz8081rna/rnd tree pin order, as follows: a) toggle the first pin (mdio) from high to low, and verify that the tdx1 pin switches from high to low to indicate that the first pin is connected properly. b) leave the first pin (mdio) low. c) toggle the second pin (mdc) from high to low, and ve rify that the txd1 pin switches from low to high to indicate that the second pin is connected properly. d) leave the first pin (mdio) and the second pin (mdc) low. e) toggle the third pin from high to low, and verify that the txd1 pin switches from high-to-low to indicate that the third pin is connected properly. f) continue with this sequence until all ksz80 81rna/rnd nand tree input pins have been toggled. each ksz8081rna/rnd nand tree input pin must cause the tx d1 output pin to toggle high-to-low or low-to-high to indicate a good connection. if the txd1 pin fails to toggle when the ksz8081rna/rnd input pin toggles from high to low, the input pin has a fault. 3.10 power management the ksz8081rna/rnd incorporates a numb er of power-management modes and features that provide methods to consume less energy. these are di scussed in the following sections. 3.10.1 power-saving mode power-saving mode is used to reduce the transceiver power consumption when the cable is unplugged. it is enabled by writing a ?1? to register 1fh, bit [10], and is in effect when auto-negotiation mode is enabled and the cable is discon- nected (no link). in this mode, the ksz8081rna/rnd shuts down all transceiver blocks except the transmitter, energy detect, and pll circuits. by default, power-saving mode is disabled after power-up. 3.10.2 energy-detect power-down mode energy-detect power-down (edpd) mode is used to furthe r reduce transceiver power consumption when the cable is unplugged. it is enabled by writing a ?0? to register 18h, bit [11], and is in ef fect when auto-negotiation mode is enabled and the cable is disconnected (no link). edpd mode works with the pll off (set by writing a ?1? to r egister 10h, bit [4] to automatic ally turn the pll off in edpd mode) to turn off all ksz8081rna/rnd transceiver blocks except the transmitter and energy-detect circuits. table 3-5: nand tree test pin order for ksz8081rna/rnd pin number pin name nand tree description 10 mdio input 11 mdc input 12 rxd1 input 13 rxd0 input 15 crs_dv input 16 ref_clk input 18 intrp input 19 txen input 23 led0 input 20 txd0 input 21 txd1 output
? 2016 microchip technology inc. ds00002199a-page 23 ksz8081rna/rnd power can be reduced further by extending the time interval between transmissions of link pulses to check for the pres- ence of a link partner. the periodic transmission of link pulses is needed to ensure two link partners in the same low power state and with auto mdi/mdi-x disabled can wa ke up when the cable is connected between them. by default, energy-detect power-down mode is disabled after power-up. 3.10.3 power-down mode power-down mode is used to power down the ksz8081rna/rnd device when it is not in use after power-up. it is enabled by writing a ?1? to register 0h, bit [11]. in this mode, the ksz8081rna/rnd disables all internal functions except the mii management interface. the ksz8081rna/rnd exits (disables) power-down mode after register 0h, bit [11] is set back to ?0?. 3.10.4 slow-oscillator mode slow-oscillator mode is used to disconnect the input refer ence crystal/clock on xi (pin 8) and select the on-chip slow oscillator when the ksz8081rna/rnd device is not in use after power-up. it is enabl ed by writing a ?1? to register 11h, bit[5]. slow-oscillator mode works in conjunction with power-d own mode to put the ksz8081rna /rnd device in the lowest power state, with all internal functions disabled except the mii management interf ace. to properly exit this mode and return to normal phy operation, use the following programming sequence: 1. disable slow-oscillator mode by writing a ?0? to register 11h, bit [5]. 2. disable power-down mode by writing a ?0? to register 0h, bit [11]. 3. initiate software reset by writin g a ?1? to register 0h, bit [15]. 3.11 reference circuit for power and ground connections the ksz8081rna/rnd is a single 3.3v s upply device with a built-in regulator to supply the 1.2v core. the power and ground connections are shown in figure 3-9 and ta b l e 3 - 6 for 3.3v vddio. figure 3-9: ksz8081rna/rnd power and ground connections vddio ksz8081rna/rnd gnd 3.3v vdda_3.3 0.1f 1 vdd_1.2 2 ferrite bead 14 22 paddle 2.2f 0.1f 22f 0.1f 22f
ksz8081rna/rnd ds00002199a-page 24 ? 2016 microchip technology inc. 3.12 typical current/power consumption table 3-7 , table 3-8 , and ta b l e 3 - 9 show typical values for current consumption by the transceiver (vdda_3.3) and dig- ital i/o (vddio) power pins and typical values for powe r consumption by the ksz8081rna/rnd device for the indi- cated nominal operating voltage combinations. these current and power consumption values include the transmit driver current and on-chip regulator current for the 1.2v core. table 3-6: ksz8081rna/rnd power pin description power pin pin number description vdd_1.2 1 decouple with 2.2 f and 0.1 f capacitors to ground. vdda_3.3 2 connect to board?s 3.3v supply through a ferrite bead. decouple with 22 f and 0.1 f capacitors to ground. vddio 14 connect to board?s 3.3v supply for 3.3v vddio. decouple with 22 f and 0.1 f capacitors to ground. table 3-7: typical current/power consum ption (vdda_3.3 = 3.3v, vddio = 3.3v) condition 3.3v transceiver (vdda_3.3) 3.3v digital i/os (vddio) total chip power 100base-tx link-up (no traffic) 34 ma 12 ma 152 mw 100base-tx full-duplex @ 100% utilization 34 ma 13 ma 155 mw 10base-t link-up (no traffic) 14 ma 11 ma 82.5 mw 10base-t full-duplex @ 100% utilization 30 ma 11 ma 135 mw power-saving mode (reg. 1fh, bit [10] = 1) 14 ma 10 ma 79.2 mw edpd mode (reg. 18h, bit [11] = 0) 10 ma 10 ma 66 mw edpd mode (reg. 18h, bit [11] = 0) and pll off (reg. 10h, bit [4] = 1) 3.77 ma 1.54 ma 1.75 mw software power-down mode (reg. 0h, bit [11] =1) 2.59 ma 1.51 ma 13.5 mw software power-down mode (reg. 0h, bit [11] =1) and slow-oscillator mode (reg. 11h, bit [5] =1) 1.36 ma 0.45 ma 5.97 mw table 3-8: typical current/power consum ption (vdda_3.3 = 3.3v, vddio = 2.5v) condition 3.3v transceiver (vdda_3.3) 2.5v digital i/os (vddio) total chip power 100base-tx link-up (no traffic) 34 ma 12 ma 142 mw 100base-tx full-duplex @ 100% utilization 34 ma 13 ma 145 mw 10base-t link-up (no traffic) 15 ma 11 ma 77 mw 10base-t full-duplex @ 100% utilization 27 ma 11 ma 117 mw power-saving mode (reg. 1fh, bit [10] = 1) 15 ma 10 ma 74.5 mw edpd mode (reg. 18h, bit [11] = 0) 11 ma 10 ma 61.3 mw edpd mode (reg. 18h, bit [11] = 0) and pll off (reg. 10h, bit [4] = 1) 3.55 ma 1.35 ma 15.1 mw software power-down mode (reg. 0h, bit [11] =1) 2.29 ma 1.34 ma 10.9 mw software power-down mode (reg. 0h, bit [11] =1) and slow-oscillator mode (reg. 11h, bit [5] =1) 1.15 ma 0.29 ma 4.52 mw
? 2016 microchip technology inc. ds00002199a-page 25 ksz8081rna/rnd table 3-9: typical current/power consum ption (vdda_3.3 = 3.3v, vddio = 1.8v) condition 3.3v transceiver (vdda_3.3) 1.8v digital i/os (vddio) total chip power 100base-tx link-up (no traffic) 34 ma 11 ma 132 mw 100base-tx full-duplex @ 100% utilization 34 ma 12 ma 134 mw 10base-t link-up (no traffic) 15 ma 10 ma 67.5 mw 10base-t full-duplex @ 100% utilization 27 ma 10 ma 107 mw power-saving mode (reg. 1fh, bit [10] = 1) 15 ma 9 ma 65.7 mw edpd mode (reg. 18h, bit [11] = 0) 11 ma 9 ma 52.5 mw edpd mode (reg. 18h, bit [11] = 0) and pll off (reg. 10h, bit [4] = 1) 4.05 ma 1.21 ma 15.5 mw software power-down mode (reg. 0h, bit [11] =1) 2.79 ma 1.21 ma 11.4 mw software power-down mode (reg. 0h, bit [11] =1) and slow-oscillator mode (reg. 11h, bit [5] =1) 1.65 ma 0.19 ma 5.79 mw
ksz8081rna/rnd ds00002199a-page 26 ? 2016 microchip technology inc. 4.0 register descriptions this chapter describes the various co ntrol and status registers (csrs). 4.1 register map 4.2 register descriptions table 4-1: registers suppo rted by ksz8081rna/rnd register number (hex) description 0h basic control 1h basic status 2h phy identifier 1 3h phy identifier 2 4h auto-negotiation advertisement 5h auto-negotiation link partner ability 6h auto-negotiation expansion 7h auto-negotiation next page 8h link partner next page ability 9h reserved 10h digital reserved control 11h afe control 1 12h - 14h reserved 15h rxer counter 16h operation mode strap override 17h operation mode strap status 18h expanded control 19h - 1ah reserved 1bh interrupt control/status 1ch reserved 1dh linkmd control/status 1eh phy control 1 1fh phy control 2 table 4-2: register descriptions address name description mode note 4-1 default register 0h ? basic control 0.15 reset 1 = software reset 0 = normal operation this bit is self-cleared after a ?1? is written to it. rw/sc 0 0.14 loopback 1 = loopback mode 0 = normal operation rw 0 0.13 speed select 1 = 100mbps 0 = 10mbps this bit is ignored if auto-negotiation is enabled (register 0.12 = 1). rw set by the anen_- speed strapping pin. see the strap-in options - ksz8081rna/rnd section for details.
? 2016 microchip technology inc. ds00002199a-page 27 ksz8081rna/rnd 0.12 auto-negoti- ation enable 1 = enable auto-negotiation process 0 = disable auto-negotiation process if enabled, the auto-negotiation result overrides the settings in registers 0.13 and 0.8. rw set by the anen_- speed strapping pin. see the strap-in options - ksz8081rna/rnd section for details. 0.11 power-down 1 = power-down mode 0 = normal operation if software reset (register 0.15) is used to exit power-down mode (register 0.11 = 1), two soft- ware reset writes (register 0.15 = 1) are required. the first write clears power-down mode; the sec- ond write resets the chip and re-latches the pin strapping pin values. rw 0 0.10 isolate 1 = electrical isolation of phy from mii 0 = normal operation rw 0 0.9 restart auto- negotiation 1 = restart auto-negotiation process 0 = normal operation. this bit is self-cleared after a ?1? is written to it. rw/sc 0 0.8 duplex mode 1 = full-duplex 0 = half-duplex rw 1 0.7 collision test 1 = enable col test 0 = disable col test rw 0 0.6:0 reserved reserved ro 000_0000 register 1h - basic status 1.15 100base-t4 1 = t4 capable 0 = not t4 capable ro 0 1.14 100base-tx full-duplex 1 = capable of 100mbps full-duplex 0 = not capable of 100mbps full-duplex ro 1 1.13 100base-tx half-duplex 1 = capable of 100mbps half-duplex 0 = not capable of 100mbps half-duplex ro 1 1.12 10base-t full-duplex 1 = capable of 10mbps full-duplex 0 = not capable of 10mbps full-duplex ro 1 1.11 10base-t half-duplex 1 = capable of 10mbps half-duplex 0 = not capable of 10mbps half-duplex ro 1 1.10:7 reserved reserved ro 000_0 1.6 no preamble 1 = preamble suppression 0 = normal preamble ro 1 1.5 auto-negoti- ation com- plete 1 = auto-negotiation process completed 0 = auto-negotiation process not completed ro 0 1.4 remote fault 1 = remote fault 0 = no remote fault ro/lh 0 1.3 auto-negoti- ation ability 1 = can perform auto-negotiation 0 = cannot perform auto-negotiation ro 1 1.2 link status 1 = link is up 0 = link is down ro/ll 0 1.1 jabber detect 1 = jabber detected 0 = jabber not detected (default is low) ro/lh 0 table 4-2: register descriptions (continued) address name description mode note 4-1 default
ksz8081rna/rnd ds00002199a-page 28 ? 2016 microchip technology inc. 1.0 extended capability 1 = supports extended capability registers ro 1 register 2h - phy identifier 1 2.15:0 phy id number assigned to the 3rd through 18th bits of the organi- zationally unique identif ier (oui). kendin com- munication?s oui is 0010a1 (hex). ro 0022h register 3h - phy identifier 2 3.15:10 phy id num- ber assigned to the 19th through 24th bits of the orga- nizationally unique iden tifier (oui). kendin com- munication?s oui is 0010a1 (hex). ro 0001_01 3.9:4 model num- ber six-bit manufacturer?s model number ro 01_0110 3.3:0 revision number four-bit manufacturer?s revision number ro indicates silicon revi- sion to rev. a; a2 = 0x0, a3 = 0x1. register 4h - auto-negotiation advertisement 4.15 next page 1 = next page capable 0 = no next page capability note: recommend to set this bit to ?0?. rw 1 4.14 reserved reserved ro 0 4.13 remote fault 1 = remote fault supported 0 = no remote fault rw 0 4.12 reserved reserved ro 0 4.11:10 pause [00] = no pause [10] = asymmetric pause [01] = symmetric pause [11] = asymmetric and symmetric pause rw 00 4.9 100base-t4 1 = t4 capable 0 = no t4 capability ro 0 4.8 100base-tx full-duplex 1 = 100mbps full-duplex capable 0 = no 100mbps full-duplex capability rw set by the anen_- speed strapping pin. see the strap-in options - ksz8081rna/rnd section for details. 4.7 100base-tx half-duplex 1 = 100mbps half-duplex capable 0 = no 100mbps half-duplex capability rw set by the anen_- speed strapping pin. see the strap-in options - ksz8081rna/rnd section for details. 4.6 10base-t full-duplex 1 = 10mbps full-duplex capable 0 = no 10mbps full-duplex capability rw 1 4.5 10base-t half-duplex 1 = 10mbps half-duplex capable 0 = no 10mbps half-duplex capability rw 1 4.4:0 selector field [00001] = ieee 802.3 rw 0_0001 register 5h - auto-negotia tion link partner ability 5.15 next page 1 = next page capable 0 = no next page capability ro 0 table 4-2: register desc riptions (continued) address name description mode note 4-1 default
? 2016 microchip technology inc. ds00002199a-page 29 ksz8081rna/rnd 5.14 acknowledge 1 = link code word received from partner 0 = link code word not yet received ro 0 5.13 remote fault 1 = remote fault detected 0 = no remote fault ro 0 5.12 reserved reserved ro 0 5.11:10 pause [00] = no pause [10] = asymmetric pause [01] = symmetric pause [11] = asymmetric and symmetric pause ro 00 5.9 100base-t4 1 = t4 capable 0 = no t4 capability ro 0 5.8 100base-tx full-duplex 1 = 100mbps full-duplex capable 0 = no 100mbps full-duplex capability ro 0 5.7 100base-tx half-duplex 1 = 100mbps half-duplex capable 0 = no 100mbps half-duplex capability ro 0 5.6 10base-t full-duplex 1 = 10mbps full-duplex capable 0 = no 10mbps full-duplex capability ro 0 5.5 10base-t half-duplex 1 = 10mbps half-duplex capable 0 = no 10mbps half-duplex capability ro 0 5.4:0 selector field [00001] = ieee 802.3 ro 0_0001 register 6h - auto-n egotiation expansion 6.15:5 reserved reserved ro 0000_0000_000 6.4 parallel detection fault 1 = fault detected by parallel detection 0 = no fault detected by parallel detection ro/lh 0 6.3 link partner next page able 1 = link partner has next page capability 0 = link partner does not have next page capability ro 0 6.2 next page able 1 = local device has next page capability 0 = local device does not have next page capabil- ity ro 1 6.1 page received 1 = new page received 0 = new page not received yet ro/lh 0 6.0 link partner auto-negoti- ation able 1 = link partner has auto-negotiation capability 0 = link partner does not have auto-negotiation capability ro 0 register 7h - auto-n egotiation next page 7.15 next page 1 = additional next pages will follow 0 = last page rw 0 7.14 reserved reserved ro 0 7.13 message page 1 = message page 0 = unformatted page rw 1 7.12 acknowl- edge2 1 = will comply with message 0 = cannot comply with message rw 0 7.11 toggle 1 = previous value of the transmitted link code word equaled logic 1 0 = logic 0 ro 0 table 4-2: register descriptions (continued) address name description mode note 4-1 default
ksz8081rna/rnd ds00002199a-page 30 ? 2016 microchip technology inc. 7.10:0 message field 11-bit wide field to encode 2048 messages rw 000_0000_0001 register 8h - link partner next page ability 8.15 next page 1 = additional next pages will follow 0 = last page ro 0 8.14 acknowledge 1 = successf ul receipt of link word 0 = no successful re ceipt of link word ro 0 8.13 message page 1 = message page 0 = unformatted page ro 0 8.12 acknowl- edge2 1 = can act on the information 0 = cannot act on the information ro 0 8.11 toggle 1 = previous value of transmitted link code word equal to logic 0 0 = previous value of transmitted link code word equal to logic 1 ro 0 8.10:0 message field 11-bit wide field to encode 2048 messages ro 000_0000_0000 register 10h ? digital reserved control 10.15:5 reserved reserved rw 0000_0000_000 10.4 pll off 1 = turn pll off automatically in edpd mode 0 = keep pll on in edpd mode. see also register 18h, bit [11] for edpd mode rw 0 10.3:0 reserved reserved rw 0000 register 11h ? afe control 1 11.15:6 reserved reserved rw 0000_0000_00 11.5 slow-oscilla- tor mode enable slow-oscillator mode is used to disconnect the input reference crystal/clock on the xi pin and select the on-chip slow oscillator when the ksz8081rna/rnd device is not in use after power-up. 1 = enable 0 = disable this bit automatically sets software power-down to the analog side when enabled. rw 0 11.4:0 reserved reserved rw 0_0000 register 15h ? rxer counter 15.15:0 rxer counter receive error counter for sym bol error frames ro/sc 0000h register 16h ? operation mode strap override 16.15 reserved factory mode 0 = normal operation 1 = factory test mode if rxer (pin 17) latches in a pull-up value at the de-assertion of reset, write a ?0? to this bit to clear reserved factory mode. rw 0 set by the pull-up / pull-down value of rxer (pin 17). 16.14:11 reserved reserved rw 000_0 16.10 reserved reserved ro 0 16.9 b- cast_off override 1 = override strap-in for b-cast_off if bit is ?1?, phy address 0 is non-broadcast. rw 0 table 4-2: register desc riptions (continued) address name description mode note 4-1 default
? 2016 microchip technology inc. ds00002199a-page 31 ksz8081rna/rnd 16.8:7 reserved reserved rw 0_0 16.6 rmii b-to-b override 1 = override strap-in for rmii back-to-back mode (also set bit 1 of this register to ?1?) rw 0 16.5 nand tree override 1 = override strap-in for nand tree mode rw 0 16.4:2 reserved reserved rw 0_00 16.1 rmii over- ride 1 = override strap-in for rmii mode rw 1 16.0 reserved reserved rw 0 register 17h - operation mode strap status 17.15:13 phyad[2:0] strap-in sta- tus [000] = strap to phy address 0 [011] = strap to phy address 3 the ksz8081rna/rnd supports only phy addresses 0h and 3h. ro 17.12:2 reserved reserved ro 17.1 rmii strap-in status 1 = strap to rmii mode ro 17.0 reserved reserved ro register 18h - expanded control 18.15:12 reserved reserved rw 0000 18.11 edpd dis- abled energy-detect power-down mode 1 = disable 0 = enable see also register 10h, bit [4] for pll off. rw 1 18.10:0 reserved reserved rw 000_0000_0000 register 1bh ? interrupt control/status 1b.15 jabber inter- rupt enable 1 = enable jabber interrupt 0 = disable jabber interrupt rw 0 1b.14 receive error inter- rupt enable 1 = enable receive error interrupt 0 = disable receive error interrupt rw 0 1b.13 page received interrupt enable 1 = enable page received interrupt 0 = disable page received interrupt rw 0 1b.12 parallel detect fault interrupt enable 1 = enable parallel detect fault interrupt 0 = disable parallel detect fault interrupt rw 0 1b.11 link partner acknowl- edge inter- rupt enable 1 = enable link partner acknowledge interrupt 0 = disable link partner acknowledge interrupt rw 0 1b.10 link-down interrupt enable 1= enable link-down interrupt 0 = disable link-down interrupt rw 0 1b.9 remote fault interrupt enable 1 = enable remote fault interrupt 0 = disable remote fault interrupt rw 0 table 4-2: register descriptions (continued) address name description mode note 4-1 default
ksz8081rna/rnd ds00002199a-page 32 ? 2016 microchip technology inc. 1b.8 link-up interrupt enable 1 = enable link-up interrupt 0 = disable link-up interrupt rw 0 1b.7 jabber inter- rupt 1 = jabber occurred 0 = jabber did not occur ro/sc 0 1b.6 receive error inter- rupt 1 = receive error occurred 0 = receive error did not occur ro/sc 0 1b.5 page receive interrupt 1 = page receive occurred 0 = page receive did not occur ro/sc 0 1b.4 parallel detect fault interrupt 1 = parallel detect fault occurred 0 = parallel detect fault did not occur ro/sc 0 1b.3 link partner acknowl- edge inter- rupt 1 = link partner acknowledge occurred 0 = link partner acknowledge did not occur ro/sc 0 1b.2 link-down interrupt 1 = link-down occurred 0 = link-down did not occur ro/sc 0 1b.1 remote fault interrupt 1 = remote fault occurred 0 = remote fault did not occur ro/sc 0 1b.0 link-up interrupt 1 = link-up occurred 0 = link-up did not occur ro/sc 0 register 1dh ? linkmd control/status 1d.15 cable diag- nostic test enable 1 = enable cable diagnostic test. after test has completed, this bit is self-cleared. 0 = indicates cable diagnostic test (if enabled) has completed and the status information is valid for read. rw/sc 0 1d.14:13 cable diag- nostic test result [00] = normal condition [01] = open condition has been detected in cable [10] = short condition has been detected in cable [11] = cable diagnostic test has failed ro 00 1d.12 short cable indicator 1 = short cable (<10 meter) has been detected by linkmd ro 0 1d.11:9 reserved reserved rw 000 1d.8:0 cable fault counter distance to fault ro 0_0000_0000 register 1eh ? phy control 1 1e.15:10 reserved reserved ro 0000_00 1e.9 enable pause (flow control) 1 = flow control capable 0 = no flow control capability ro 0 1e.8 link status 1 = link is up 0 = link is down ro 0 1e.7 polarity sta- tus 1 = polarity is reversed 0 = polarity is not reversed ro 1e.6 reserved reserved ro 0 table 4-2: register desc riptions (continued) address name description mode note 4-1 default
? 2016 microchip technology inc. ds00002199a-page 33 ksz8081rna/rnd 1e.5 mdi/mdi-x state 1 = mdi-x 0 = mdi ro 1e.4 energy detect 1 = signal present on receive differential pair 0 = no signal detected on receive differential pair ro 0 1e.3 phy isolate 1 = phy in isolate mode 0 = phy in normal operation rw 0 1e.2:0 operation mode indica- tion [000] = still in auto-negotiation [001] = 10base-t half-duplex [010] = 100base-tx half-duplex [011] = reserved [100] = reserved [101] = 10base-t full-duplex [110] = 100base-tx full-duplex [111] = reserved ro 000 register 1fh ? phy control 2 1f.15 hp_mdix 1 = hp auto mdi/mdi-x mode 0 = microchip auto mdi/mdi-x mode rw 1 1f.14 mdi/mdi-x select when auto mdi/mdi-x is disabled, 1 = mdi-x mode transmit on rxp,rxm (pins 4, 3) and receive on txp,txm (pins 6, 5) 0 = mdi mode transmit on txp,txm (pins 6, 5) and receive on rxp,rxm (pins 4, 3) rw 0 1f.13 pair swap disable 1 = disable auto mdi/mdi-x 0 = enable auto mdi/mdi-x rw 0 1f.12 reserved reserved rw 0 1f.11 force link 1 = force link pass 0 = normal link operation this bit bypasses the control logic and allows the transmitter to send a pattern even if there is no link. rw 0 1f.10 power sav- ing 1 = enable power saving 0 = disable power saving rw 0 1f.9 interrupt level 1 = interrupt pin active high 0 = interrupt pin active low rw 0 1f.8 enable jab- ber 1 = enable jabber counter 0 = disable jabber counter rw 1 1f.7 rmii refer- ence clock select 1 = for ksz8081rna, clock input to xi (pin 8) is 50mhz for rmii ? 50mhz clock mode. for KSZ8081RND, clock input to xi (pin 8) is 25mhz for rmii ? 25mhz clock code. 0 = for ksz8081rna, clock input to xi (pin 8) is 25mhz for rmii ? 25mhz clock code. for KSZ8081RND, clock input to xi (pin 8) is 50mhz for rmii ? 50mhz clock mode. rw 0 1f.6 reserved reserved rw 0 1f.5:4 led mode [00] = led0: link/activity [01] = led0: link [10], [11] = reserved rw 00 1f.3 disable transmitter 1 = disable transmitter 0 = enable transmitter rw 0 table 4-2: register descriptions (continued) address name description mode note 4-1 default
ksz8081rna/rnd ds00002199a-page 34 ? 2016 microchip technology inc. note 4-1 rw = read/write; ro = read only; sc = self-cleared; lh = latch high; ll = latch low. 1f.2 remote loopback 1 = remote (analog) loopback is enabled 0 = normal mode rw 0 1f.1 reserved reserved rw 0 1f.0 disable data scrambling 1 = disable scrambler 0 = enable scrambler rw 0 table 4-2: register desc riptions (continued) address name description mode note 4-1 default
? 2016 microchip technology inc. ds00002199a-page 35 ksz8081rna/rnd 5.0 operational characteristics 5.1 absolute maximum ratings* supply voltage (v in ) (v dd_1.2 ).............................................................................................................................. ...................... ?0.5v to +1.8v (v ddio , v dda_3.3 ) .............................................................................................................................. ........ ?0.5v to +5.0v input voltage (all inputs)..................................................................................................... ....................... ?0.5v to +5.0v output voltage (all outputs)................................................................................................... .................... ?0.5v to +5.0v lead temperature (soldering, 10s) .............................................................................................. ......................... +260c storage temperature (t s ) .............. .............. .............. .............. .............. .............. .............. .............. ...... ?55c to +150c *exceeding the absolute maximum rating may damage the dev ice. stresses greater than the absolute maximum rating may cause permanent damage to the device. operation of the de vice at these or any other conditions above those spec- ified in the operating sections of this specification is not implied. maximum conditions for extended periods may affect reliability. 5.2 operating ratings** supply voltage (v ddio_3.3 , v dda_3.3 ) ........................................................................................................................ +3.135 v to +3.465v (v ddio_2.5 ) .............................................................................................................................. .......... +2.375v to +2.625v (v ddio_1.8 ) .............................................................................................................................. .......... +1.710v to +1.890v ambient temperature (t a commercial)................................................................................................................... ........................ 0c to +70c (t a industrial) ........... .............. .............. .............. .............. .............. .............. ........... ......... ........................ ?40c to +85c maximum junction temperature (t j max.) ........................................................................................................... +125c thermal resistance ( ja ).............................................................................................................................. +47.84c/w thermal resistance ( jc ) .............................................................................................................................+ 14.71c/w **the device is not guaranteed to function outside its operating ratings. note: do not drive input signals without power supplied to the device.
ksz8081rna/rnd ds00002199a-page 36 ? 2016 microchip technology inc. 6.0 electrical characteristics t a = 25c. specification is for packaged product only. table 6-1: electrical characteristics parameters symbol min. typ. max. units note supply current (v ddio , v dda_3.3 = 3.3v), note 6-1 10base-t i dd1_3.3v ? 41 ? ma full-duplex traffic @ 100% utilization 100base-tx i dd2_3.3v ? 47 ? ma full-duplex traffic @ 100% utilization edpd mode i dd3_3.3v ?20?ma ethernet cable disconnected (reg. 18h.11 = 0) power-down mode i dd4_3.3v ?4?ma software power-down (reg. 0h.11 = 1) cmos level inputs output high voltage v oh 2.4 ? ? v v ddio = 3.3v 2.0 ? ? v v ddio = 2.5v 1.5 ? ? v v ddio = 1.8v output low voltage v ol ??0.4v v ddio = 3.3v ??0.4v v ddio = 2.5v ??0.3v v ddio = 1.8v output tri-state leakage |i oz |??10a ? led output output drive current i led ? 8 ? ma led0 pin all pull-up/pull-down pins (including strapping pins) internal pull-up resistance pu 30 45 73 k ? v ddio = 3.3v 39 61 102 k ? v ddio = 2.5v 48 99 178 k ? v ddio = 1.8v internal pull-down resistance pd 26 43 79 k ? v ddio = 3.3v 34 59 113 k ? v ddio = 2.5v 53 99 200 k ? v ddio = 1.8v 100base-tx transmit (measured differentially after 1:1 transformer) peak differential output voltage v o 0.95 ? 1.05 v 100 ? termination across differential output output voltage imbalance v imb ?? 2 % 100 ? termination across differential output rise/fall time t r /t f 3?5ns ? rise/fall time imbalance ? 0 ? 0.5 ns ? duty cycle distortion ? ? ? 0.25 ns ? overshoot ? ? ? 5 % ? output jitter ? ? 0.7 ? ns peak-to-peak 10base-t transmit (measured differentially after 1:1 transformer) peak differential output voltage v p 2.2 ? 2.8 v 100 ? termination across differential output jitter added ? ? ? 3.5 ns peak-to-peak rise/fall time t r /t f ?25?ns ? 10base-t receive squelch threshold v sq ? 400 ? mv 5 mhz square wave transmitter - drive setting reference voltage of i set v set ?0.65? v r(i set ) = 6.49 k ?
? 2016 microchip technology inc. ds00002199a-page 37 ksz8081rna/rnd note 6-1 current consumption is for the single 3.3v supply ksz8081rna/rnd device only, and includes the transmit driver current and the 1.2v supply voltage (v dd_1.2 ) that are supplied by the ksz8081rna/ rnd. ref_clk output 50 mhz rmii clock output jitter ??300?ps peak-to-peak. applies only to rmii - 25 mhz clock mode. 100 mbps mode - industrial applications parameters link loss reaction (indication) time t llr ?4.4? s link loss detected at receive differential inputs to phy signal indication time for each of the following: 1. for led mode 01, link led output changes from low (link-up) to high (link-down). 2. intrp pin asserts for link-down status change. table 6-1: electrical characteristics (continued) parameters symbol min. typ. max. units note
ksz8081rna/rnd ds00002199a-page 38 ? 2016 microchip technology inc. 7.0 timing diagrams 7.1 rmii timing figure 7-1: rmii timing - data received from rmii figure 7-2: rmii timing - data input to rmii table 7-1: rmii timing parameters (25 mhz input to xi pin, 50 mhz output from ref_clk pin) parameter description min. typ. max. units t cyc clock cycle ? 20 ? ns t 1 setup time 4 ? ? ns t 2 hold time 2 ? ? ns t od output delay 7 10 13 ns table 7-2: rmii timing parameter s (50 mhz input to xi pin) parameter description min. typ. max. units t cyc clock cycle ? 20 ? ns t 1 setup time 4 ? ? ns t 2 hold time 2 ? ? ns t od output delay 8 11 13 ns t cyc ref_clk txen txd[1:0] t 1 t 2 transmit timing t cyc ref_clk crs_dv rxd[1:0] rxer t od receive timing
? 2016 microchip technology inc. ds00002199a-page 39 ksz8081rna/rnd 7.2 auto-negotiation timing figure 7-3: auto-negotiation fast link pulse (flp) timing table 7-3: auto-negotiation fast link pulse timing parameters parameter description min. typ. max. units t btb flp burst to flp burst 8 16 24 ms t flpw flp burst width ? 2 ? ms t pw clock/data pulse width ? 100 ? ns t ctd clock pulse to data pulse 55.5 64 69.5 s t ctc clock pulse to clock pulse 111 128 139 s ? number of clock/data pulses per flp burst 17 ? 33 ? auto -negotiation fast link pulse (flp) timing t pw tx+/tx- clock pulse data pulse clock pulse t pw t ctd t ctc t flpw t btb tx+/tx- data pulse flp burst flp burst
ksz8081rna/rnd ds00002199a-page 40 ? 2016 microchip technology inc. 7.3 mdc/mdio timing figure 7-4: mdc/mdio timing table 7-4: mdc/mdio timing parameters parameter description min. typ. max. units fc mdc clock frequency ? 2.5 10 mhz t p mdc period ? 400 ? ns t md1 mdio (phy input) setup to rising edge of mdc 10 ? ? ns t md2 mdio (phy input) hold from rising edge of mdc 4 ? ? ns t md3 mdio (phy output) delay from rising edge of mdc 5 222 ? ns t md1 valid data mdio (phy input) valid data mdc t md2 mdio (phy output) valid data t md3 t p
? 2016 microchip technology inc. ds00002199a-page 41 ksz8081rna/rnd 7.4 power-up/reset timing the ksz8081rna/rnd reset timing r equirement is summarized in figure 7-5 and table 7-5 . the supply voltage (v ddio and v dda_3.3 ) power-up waveform should be monotonic. the 300 s minimum rise time is from 10% to 90%. for warm reset, the reset (rst#) pin should be asserted low for a minimum of 500 s. the strap-in pin values are read and updated at the de-assertion of reset. after the de-assertion of reset, wait a minimum of 100 s before starting programming on the miim (mdc/mdio) inter- face. figure 7-5: power-up/reset timing table 7-5: power-up/reset timing parameters parameter description min. typ. max. units t vr supply voltage (v ddio , v dda_3.3 ) rise time 300 ? ? s t sr stable supply voltage (v ddio , v dda_3.3 ) to reset high 10 ? ? ms t cs configuration setup time 5 ? ? ns t ch configuration hold time 5 ? ? ns t rc reset to strap-in pin output 6 ? ? ns supply voltages rst# strap-in value strap-in / output pin t vr t sr t cs t ch t rc
ksz8081rna/rnd ds00002199a-page 42 ? 2016 microchip technology inc. 8.0 reset circuit figure 8-1 shows a reset circuit recommended for powering up the ksz8081rna/rnd if reset is triggered by the power supply. figure 8-1: recommended reset circuit figure 8-2 shows a reset circuit recommended for applications w here reset is driven by another device (for example, the cpu or an fpga). the reset out rst_out_n from cp u/fpga provides the warm reset after power up reset. d2 is used if using different v ddio between the switch and cpu/fp ga, otherwise, the different v ddio will fight each other. if different v ddio have to use in a special case, a low v f (<0.3v) diode is required (for example, vishay?s bat54, mss1p2l and so on), or a level shifter device can be us ed too. if ethernet device and cpu/fpga use same v ddio voltage, d2 can be removed to connect both devices dire ctly. usually, ethernet device and cpu/fpga should use same v ddio voltage. figure 8-2: recommended reset cir cuit for cpu/fpga reset output vddio d1: 1n4148 d1 r 10k ksz8081rna/rnd rst# c 10f vddio ksz8081rna/rnd d1 r 10k rst# c 10f d2 cpu/fpga rst_out_n d1, d2: 1n4148
? 2016 microchip technology inc. ds00002199a-page 43 ksz8081rna/rnd 9.0 reference circuits ? led strap-in pins the pull-up, float, and pull-down reference circuits for the led0/anen_speed strapping pin are shown in figure 9-1 for 3.3v and 2.5v v ddio . figure 9-1: reference circuits for led strapping pins for 1.8v v ddio , led indication support is not recommended due to the low voltage. without the led indicator, the anen_speed strapping pin is functional with a 4.7 k ? pull-up to 1.8v v ddio or float for a value of ?1?, and with a 1.0 k ? pull-down to ground for a value of ?0?. if using rj45 jacks with int egrated leds and 1.8v v ddio , a level shifting is required from led 3.3v to 1.8v. for example, use a bipolar transistor or a level shift device. led0 pin 220 ? 4.7k ? pull-up ksz8081rna/rnd vddio = 3.3v, 2.5v led0 pin 220 ? float ksz8081rna/rnd vddio = 3.3v, 2.5v led0 pin 220 ? pull-down ksz8081rna/rnd vddio = 3.3v, 2.5v 1k ?
ksz8081rna/rnd ds00002199a-page 44 ? 2016 microchip technology inc. 10.0 reference clock - connection and selection a crystal or external clock source, such as an oscillator, is used to provide the reference clock for the ksz8081rna/ rnd. for the ksz8081rna/rnd in rmii ? 25 mhz clock mode, the reference clock is 25 mhz. the reference clock connections to xi (pin 8) and xo (pin 7), and the reference clock selection criteria, are provided in figure 10-1 and table 10-1 . figure 10-1: 25 mhz crystal/oscillator reference clock connection note 10-1 60 ppm for overtemperature crystal. for the ksz8081rna/rnd in rmii ? 50 mhz clock mode, the re ference clock is 50 mhz. the reference clock connec- tion to xi (pin 8), and the reference cl ock selection criteria are provided in figure 10-2 and table 10-2 . figure 10-2: 50 mhz oscillator/reference clock connection table 10-1: 25 mhz crystal/refer ence clock selec tion criteria characteristics value frequency 25 mhz frequency tolerance (max.); note 10-1 50 ppm crystal series resistance (typ.) 40 ? crystal load capacitance (typ.) 16 pf table 10-2: 50 mhz oscillator/ref erence clock selection criteria characteristics value frequency 50 mhz frequency tolerance (max.) 50 ppm nc xi xo 25mhz osc 50ppm xi xo 25mhz xtal 50ppm 22pf 22pf nc xi xo 50mhz osc 50ppm
? 2016 microchip technology inc. ds00002199a-page 45 ksz8081rna/rnd 11.0 magnetic - connec tion and selection a 1:1 isolation transformer is required at the line interfac e. use one with integrated common-mode chokes for designs exceeding fcc requirements. the ksz8081rna/rnd design incorpor ates voltage-mode transmit drivers and on-chip terminations. with the voltage-mode implementation, the transmit drivers supply the common-mode voltages to the two differential pairs. therefore, the two transformer center tap pins on the ksz8081rna/rnd side should not be connected to any power supply source on the board; inst ead, the center tap pins should be sepa rated from one another and connected through separate 0.1 f common-mode capacitors to groun d. separation is required because the common-mode volt- age is different between transmitting and receiving differential pairs. figure 11-1 shows the typical magnetic interface circuit for the ksz8081rna/rnd. figure 11-1: typical magnetic interface circuit table 11-1 lists recommended magnetic characteristics. table 11-2 is a list of compatible single-port magnetics with separated transformer center tap pins on the phy chip side that can be used with the ksz8081rna/rnd. table 11-1: magnetics selection criteria parameter value test conditions turns ratio 1 ct : 1 ct ? open-circuit inductance (min.) 350 h 100 mv, 100 khz, 8 ma insertion loss (max.) ?1.1 db 100 khz to 100 mhz hipot (min.) 1500 v rms ? 1 2 3 7 8 4 5 6 4 x 75 ? 1000pf/2kv rj-45 connector chassis ground (2 x 0.1f) txp txm rxp rxm ksz8081rna/rnd signal ground
ksz8081rna/rnd ds00002199a-page 46 ? 2016 microchip technology inc. table 11-2: compatible sing le-port 10/100 magnetics manufacturer part number temperature range magnetic + rj-45 bel fuse s558-5999-u7 0c to 70c no bel fuse si-46001-f 0c to 70c yes bel fuse si-50170-f 0c to 70c yes delta lf8505 0c to 70c no halo hfj11-2450e 0c to 70c yes halo tg110-e055n5 ?40c to 85c no lankom lf-h41s-1 0c to 70c no pulse h1102 0c to 70c no pulse h1260 0c to 70c no pulse hx1188 ?40c to 85c no pulse j00-0014 0c to 70c yes pulse jx0011d21nl ?40c to 85c yes tdk tla-6t718a 0c to 70c yes transpower hb726 0c to 70c no wurth/midcom 000-7090-37r-lf1 ?40c to 85c no
? 2016 microchip technology inc. ds00002199a-page 47 ksz8081rna/rnd 12.0 package outline note: for the most current package drawings, please se e the microchip packaging specification located at http://www.microchip.com/packaging figure 12-1: 24-lead qfn 4 mm x 4 mm package
ksz8081rna/rnd ds00002199a-page 48 ? 2016 microchip technology inc. appendix a: data sheet revision history table a-1: revision history revision section/figure/entry correction ds00002199a (06-14-16) ? converted micrel data sheet ksz8081rna/rnd to microchip ds00002199a. minor text changes throughout.
? 2016 microchip technology inc. ds00002199a-page 49 ksz8081rna/rnd the microchip web site microchip provides online support via our www site at www.microchip.com . this web site is used as a means to make files and information easily available to customers. accessible by using your favorite internet browser, the web site con- tains the following information: ? product support ? data sheets and errata, application notes and sample programs, design resources, user?s guides and hardware support documents, latest software releases and archived software ? general technical support ? frequently asked questions (faq), te chnical support requests, online discussion groups, microchip consultant program member listing ? business of microchip ? product selector and ordering guides, latest microchip press releases, listing of semi- nars and events, listings of microchip sales offi ces, distributors and factory representatives customer change notification service microchip?s customer notification servic e helps keep customers current on microc hip products. subscribers will receive e-mail notification whenever there are changes, updates, revisi ons or errata related to a specified product family or development tool of interest. to register, access the microchip web site at www.microchip.com . under ?support?, click on ?customer change notifi- cation? and follow the registration instructions. customer support users of microchip products can receive assistance through several channels: ? distributor or representative ? local sales office ? field application engineer (fae) ? technical support customers should contact their distributor, representative or field application engineer (fae) for support. local sales offices are also available to help customers. a listing of sales offices and locations is included in the back of this docu- ment. technical support is available through the web site at: http://microchip.com/support
ksz8081rna/rnd ds00002199a-page 50 ? 2016 microchip technology inc. product identification system to order or obtain information, e.g., on pricing or de livery, refer to the factory or the listed sales office . device: ksz8081 interface: r = rmii package: n = 24-pin qfn special attribute: a = 25 mhz input/50 mhz output clocks d = 50 mhz input clock temperature: ca = 0 ? c to +70 ? c (commercial) ia = ?40 ? c to +85 ? c (industrial) examples: a) ksz8081rnaca rmii interface 24-pin qfn 25 mhz input/50 mhz output commercial temperature b) ksz8081rnaia rmii interface 24-pin qfn 25 mhz input/50 mhz output industrial temperature c) KSZ8081RNDca rmii interface 24-pin qfn 50 mhz input commercial temperature d) KSZ8081RNDia rmii interface 24-pin qfn 50 mhz input industrial temperature part no. x x package interface device x temperature x special attribute
? 2016 microchip technology inc. ds00002199a-page 51 information contained in this publication regarding device applications and the like is provided on ly for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with yo ur specifications. microchip make s no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fi tness for purpose . microchip disclaims all liability arising from this information and its use. use of micro- chip devices in life support and/or safety applications is entirely at the buyer?s risk, and the buyer agrees to defend, indemn ify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting from such use. no licenses are conveyed, impl icitly or otherwise, under any microchip intellectual property rights unless otherwise stated. trademarks the microchip name and logo, the microchip l ogo, anyrate, dspic, flashflex, flexpw r, heldo, jukeblox, keeloq, keeloq logo, kleer, lancheck, link md, medialb, most, most logo, mplab, optolyzer, pic, picstart, pic32 logo, righttouch, spynic, sst, sst logo, superflash and uni/o are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. clockworks, the embedded control solutions company, ethersyn ch, hyper speed control, hyperlight load, intellimos, mtouch, precision edge, and quiet-wire are registered tradem arks of microchip technology incorporated in the u.s.a. analog-for-the-digital age, any capacitor, anyin, anyout, body com, chipkit, chipkit logo, codeguard, dspicdem, dspicdem.net, dynamic average matching, dam, ecan, ethergreen, in-circuit se rial programming, icsp, inter-c hip connectivity, jitterblocker, kleernet, kleernet logo, miwi, motorbench, mpasm, mpf, mplab certified logo, mplib, mplink, multitrak, netdetach, omniscient code generation, picdem, picdem.net, pickit, pictail, puresilicon, righttouch logo, re al ice, ripple blocker, serial quad i/o, sqi, superswitcher, super switcher ii, total endurance, ts harc, usbcheck, varisense, viewspan, wiperlock, wireless dna, and zena are trademarks of mi crochip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of microchi p technology incorporated in the u.s.a. silicon storage technology is a regi stered trademark of microchip tech nology inc. in other countries. gestic is a registered trademarks of microc hip technology germany ii gmbh & co. kg, a s ubsidiary of microchip technology inc., in other countries. all other trademarks mentioned herein are property of their respective companies. ? 2016, microchip technology incorporated, printed in the u.s.a., all rights reserved. isbn: 978-1-5224-0855-0 note the following details of the code protection feature on microchip devices: ? microchip products meet the specification cont ained in their particular microchip data sheet. ? microchip believes that its family of products is one of the mo st secure families of its kind on the market today, when used i n the intended manner and under normal conditions. ? there are dishonest and possibly illegal meth ods used to breach the code protection fe ature. all of these methods, to our knowledge, require using the microchip pr oducts in a manner outside the operating specif ications contained in microchip?s data sheets. most likely, the person doing so is engaged in theft of intellectual property. ? microchip is willing to work with the customer who is concerned about the integrity of their code. ? neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as ?unbreakable.? code protection is constantly evolving. we at microchip are committed to continuously improving the code protection features of our products. attempts to break microchip?s c ode protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your softwa re or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the company?s quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microper ipherals, nonvolatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development syst ems is iso 9001:2000 certified. quality management s ystem by dnv == iso/ts 16949 ==
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