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1 zarlink semiconductor inc. zarlink, zl and the zarlink semiconductor logo are trademarks of zarlink semiconductor inc. copyright 2003-2005, zarlink semiconductor inc. all rights reserved. features ?2,048 2,048 channel non-blocking switching at 8.192 mb/s ? per-channel variable or constant throughput delay ? automatic identification of st-bus/gci interfaces ? accept st-bus streams of 2.048, 4.096 or 8.192 mb/s ? automatic frame offset delay measurement ? per-stream frame delay offset programming ? per-channel high impedance output control ? per-channel message mode ? control interface compatible to motorola non- multiplexed cpus ? connection memory block programming ? 3.3 v local i/o with 5 v tolerant inputs and ttl- compatible outputs ? ieee-1149.1 (jtag) test port applications ? medium and large switching platforms ? cti application ? voice/data multiplexer ? digital cross connects ? st-bus/gci interface functions ? support ieee 802.9a standard july 2005 ordering information mt90823ap 84 pin plcc tubes mt90823al 100 pin mqfp trays mt90823ab 100 pin lqfp trays mt90823ag 120 pin bga trays mt90823ab1 100 pin lqfp* trays mt90823ap1 84 pin plcc* tubes MT90823AL1 100 pin mqfp* trays *pb free matte tin -40 c to +85 c mt90823 3 v large digital switch data sheet figure 1 - functional block diagram test port sto0 sto1 sto2 sto3 sto4 sto5 sto6 sto7 sto8 sto9 sto10 sto11 sto12 sto13 sto14 sto15 sti0 sti1 sti2 sti3 sti4 sti5 sti6 sti7 sti8 sti9 sti10 sti11 sti12 sti13 sti14 sti15 parallel to serial converter output mux microprocessor interface timing unit internal registers f0i fe/ as/ im ds/ rd cs r/w /wr a7-a0 ale hclk dta d15-d8/ ad7-ad0 csto ode v ss connection memory clk v dd wfps tdi tdo ic reset tck trst serial to parallel converter tms multiple buffer data memory loopback
mt90823 data sheet 2 zarlink semiconductor inc. description the mt90823 large digital switch has a non-blocking switch ca pacity of: 2,048 x 2,048 channels at a serial bit rate of 8.192 mb/s; 1,024 x 1,024 channels at 4.096 mb/s; and 512 x 512 channels at 2.048 mb/s. the device has many features that are programmable on a pe r stream or per channel basis, includ ing message mode, input offset delay and high impedance output control. per stream input delay control is particularly useful for ma naging large multi-chip switches that transport both voice channel and concatenated data channels. in addition, the input stream can be individually cali brated for input frame offs et using a dedicated pin.
mt90823 data sheet 3 zarlink semiconductor inc. figure 2 - plcc and mqfp pin connections nc nc nc nc nc 73 57 59 61 63 65 69 71 67 13 29 27 25 23 19 17 15 21 31 55 10 8 6 4 2 84 82 80 78 76 34 36 38 40 42 44 46 48 50 52 d14 d12 d11 d10 d9 d8 ad2 ad1 ad0 vss vss vdd ad7 ad6 ad5 ad4 ad3 dta d13 d15 csto as/ale tck tdo a7 a6 a5 a4 a3 a2 a1 a0 cs ds/rd im tdi trst ic reset wfps tms r/w /rw sti0 sti1 sti2 sti3 sti4 sti5 sti6 sti7 sti8 sti9 sti11 sti15 fe/hclk sti10 sti12 sti13 sti14 f0i vdd clk vss ode sto0 sto1 sto2 sto3 sto4 sto5 sto6 sto7 vss vdd vss sto8 sto9 sto10 sto11 sto12 sto13 sto14 sto15 vss 84 pin plcc 100 pin mqfp 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 22 24 26 28 30 32 34 36 38 40 44 46 48 42 82 98 96 94 92 88 86 84 90 20 18 16 14 12 10 8 6 4 2 ode sto0 sto1 sto2 sto3 sto4 sto5 sto6 sto7 vss vdd vss sto8 sto9 sto10 sto11 sto12 sto13 sto14 sto15 vss csto nc nc nc nc d14 d12 d11 d10 d9 d8 ad2 ad1 ad0 vss vss vdd ad7 ad6 ad5 ad4 ad3 dta d13 d15 cs tck tdo a7 a6 a5 a4 a3 a2 a1 wfps r/w /rw ds/rd tdi trst ic tms as/ale vdd reset a0 im nc nc nc nc nc sti0 sti1 sti2 sti3 sti4 sti5 sti6 sti7 sti8 sti9 sti11 sti15 fe/hclk sti10 sti12 sti13 sti14 f0i clk vss nc nc 99 (14mm x 20mm x 2.75mm)
mt90823 data sheet 4 zarlink semiconductor inc. figure 3 - pbga and lqfp pin connections d14 d12 d11 d10 d9 d8 ad2 ad1 ad0 vss vss vdd ad7 ad6 ad5 ad4 ad3 dta d13 d15 csto as/ale tck tdo a7 a6 a5 a3 a4 a2 a1 a0 cs ds/rd im tdi trst ic reset wfps tms r/w /rw sti0 sti1 sti2 sti3 sti4 sti5 sti6 sti7 sti8 sti9 sti11 sti15 fe/hclk sti10 sti12 sti13 sti14 f0i vdd clk vss ode sto0 sto1 sto2 sto3 sto4 sto5 sto6 sto7 vss vdd vss sto8 sto9 sto10 sto11 sto12 sto13 sto14 sto15 vss vss vdd vss vdd vss vdd vss vdd vss vss vss vdd vss vss vss vss vss vdd vss vss vss vss vss vss vdd vdd vdd vss vss vss vdd vdd vdd vdd vss vss a b c d e f g h j k l m n 12345678910111213 top view 1 1 - a1 corner is identified by metallized markings. pbga nc nc csto nc 100 pin lqfp 52 76 2 ode sto0 sto1 sto2 sto3 sto4 sto5 sto6 sto7 vss vdd vss sto8 sto9 sto10 sto11 sto12 sto13 sto14 sto15 vss nc nc nc d14 d12 d11 d10 d9 d8 ad2 ad1 ad0 vss vss vdd ad7 ad6 ad5 ad4 ad3 dta d13 d15 cs tck tdo a7 a6 a5 a4 a3 a2 a1 wfps r/w /rw ds/rd tdi trst ic tms as/ale reset a0 im nc nc sti0 sti1 sti2 sti3 sti4 sti5 sti6 sti7 sti8 sti9 sti11 sti15 fe/hclk sti10 sti12 sti13 sti14 f0i clk vss nc 100 nc nc nc nc nc vdd 26 50 nc nc (ball pitch = 1.5mm) (23mm x 23mm x 2.13mm) (14mm x 14mm x 1.4mm) (pin pitch = 0.50mm) 4 6 8 101214 161820 22 24 28 30 32 34 36 38 40 42 44 46 48 54 56 58 60 62 64 66 68 70 72 74 78 80 82 84 86 88 90 92 94 96 98
mt90823 data sheet 5 zarlink semiconductor inc. pin description pin # name description 84 plcc 100 mqfp 100 lqfp 120 bga 1, 11, 30, 54 64, 75 31, 41, 56, 66, 76, 99 28, 38, 53, 63, 73, 96 a1,a2,a12,a13, b1,b2,b7,b12, b13,c3,c5,c7, c9,c11,e3,e11 g3,g11,j3,j11, l3,l5,l7,l9,l11, m1,m2,m12,m13 v ss ground. 2, 32, 63 5, 40, 67 37, 64,98 c4,c6,c8,c10, d3,d11,f3,f11, h3,h11,k3,k11, l4,l6,l8,l10 v dd +3.3 volt power supply. 3 - 10 68-75 65 - 72 b6,a6,a5,b5,a4, b4,a3,b3 sto8 - 15 st-bus output 8 to 15 (5 v tolerant three-state outputs): serial data output stream. these streams may have data rates of 2.048, 4.096 or 8.192 mb/s, depending upon the value programmed at bits dr0 - 1 in the ims register. 12 - 27 81-96 78 - 93 c1,c2,d1,d2,e1, e2,f1,f2,g1,g2, h1,h2,j1,j2,k1, k2 sti0 - 15 st-bus input 0 to 15 (5 v tolerant inputs): serial data input stream. these streams may have data rates of 2.048, 4.096 or 8.192 mb/s, depending upon the value programmed at bits dr0 - 1 in the ims register. 28 97 94 l1 f0i frame pulse (5 v tolerant input): when the wfps pin is low, this input accepts and automatically identifies frame synchroni zation signals formatted according to st-bus and gci specifications. when the wfps pin is high, this pin accepts a negative frame pulse which conforms to wfps formats. 29 98 95 l2 fe/hclk frame evaluation / hclk clock (5 v tolerant input): when the wfps pin is low, this pin is the frame measurement input. when the wfps pin is high, the hclk (4.096mhz clock) is required for frame alignment in the wide frame pulse (wfp) mode. 31 100 97 n1 clk clock (5 v tolerant input): serial clock for shifting data in/out on the serial streams (sti/o 0 - 15). depending upon the value programmed at bits dr0 - 1 in the ims register, this i nput accepts a 4.096, 8.192 or 16.384 mhz clock. 33 6 3 n2 tms test mode select (3.3 v input with internal pull-up): jtag signal that controls the tap controller state transitions. 34 7 4 m3 tdi test serial data in (3.3 v to lerant input with internal pull-up): jtag serial test instructions and data are shifted in on this pin.
mt90823 data sheet 6 zarlink semiconductor inc. 35 8 5 n3 tdo test serial data out (3.3 v output): jtag serial data is output on this pin on the falling edge of tck. this pin is held in high impedance state when jtag scan is not enabled. 36 9 6 m4 tck test clock (5 v tolerant input): provides the clock to the jtag test logic. 37 10 7 n4 trst test reset (3.3 v input with internal pull-up): asynchronously initializes the jtag tap controller by putting it in the test-logic-r eset state. this pin should be pulsed low on power-up, or held low, to ensure that the mt90823 is in the normal functional mode. 38 11 8 m5 ic internal connection (3.3 v input with internal pull- down): connect to v ss for normal operation. this pin must be low for the mt90823 to function normally and to comply with ieee 1149 (jtag) boundary scan requirements. 39 12 9 n5 reset device reset (5 v tolerant input): this input (active low) puts the mt90823 in its reset state to clear the device internal counters, r egisters and bring sto0 - 15 and microport data outputs to a high impedance state. the time constant for a power up reset circuit must be a minimum of five times the rise time of the power supply. in normal operation, the reset pin must be held low for a minimum of 100 nsec to reset the device. 40 13 10 m6 wfps wide frame pulse select (5 v tolerant input): when 1, enables the wide fr ame pulse (wfp) frame alignment interface. when 0, the device operates in st-bus/gci mode. 41 - 48 14-21 11 - 18 n6,m7,n7,n8, m8,n9,m9,n10 a0 - a7 address 0 - 7 (5 v tolerant input): when non- multiplexed cpu bus operation is selected, these lines provide the a0 - a7 address lines to the internal memories. 49 22 19 n11 ds/rd data strobe / read (5 v tolerant input): for motorola multiplexed bus operation, this input is ds. this active high ds input works in conjunction with cs to enable the read and write operations. for motorola non-multiplexed cpu bus operation, this input is ds. this active lo w input works in conjunction with cs to enable the read and write operations. for multiplexed bus operation, this input is rd . this active low input sets the data bus lines (ad0-ad7, d8- d15) as outputs. pin description (continued) pin # name description 84 plcc 100 mqfp 100 lqfp 120 bga
mt90823 data sheet 7 zarlink semiconductor inc. 50 23 20 m10 r/w / wr read/write / write (5 v tolerant input): in the cases of motorola non-multiplexed and multiplexed bus operations, this input is r/w. this input controls the direction of the data bus lines (ad0 - ad7, d8-d15) during a microprocessor access. for multiplexed bus operation, this input is wr. this active low input is used with rd to control the data bus (ad0 - 7) lines as inputs. 51 24 21 n12 cs chip select (5 v tolerant input): active low input used by a microprocessor to activate the microprocessor port of mt90823. 52 25 22 m11 as/ale address strobe or latch enable (5 v tolerant input): this input is used if multiplexed bus operation is selected via the im input pin. for motorola non- multiplexed bus operation, connect this pin to ground. 53 26 23 n13 im cpu interface mode (5 v tolerant input): when im is high, the microprocessor port is in the multiplexed mode. when im is low, the microprocessor port is in non-multiplexed mode. 55 - 62 32-39 29 - 36 l12,l13,k12, k13,j12,j13, h12,h13 ad0 - 7 address/data bus 0 to 7 (5 v tolerant i/o): these pins are the eight least si gnificant data bits of the microprocessor port. in mult iplexed mode, these pins are also the input address bits of the microprocessor port. 65 - 72 42-49 39 - 46 g12,g13,f12, f13,e12,e13, d12,d13 d8 - 15 data bus 8-15 (5 v tolerant i/o): these pins are the eight most significant data bits of the microprocessor port. 73 50 47 c12 dta data transfer acknowledgement (5 v tolerant three-state output): indicates that a data bus transfer is complete. when the bus cycle ends, this pin drives high and then tri-states, allowing for faster bus cycles with a weaker pull-up resistor. a pull-up resistor is required to hold a high level when the pin is tri-stated. 74 55 48 c13 csto control output (5 v tolerant output). this is a 4.096, 8.192 or 16.384 mb/s output containing 512, 1024 or 2048 bits per frame respectively. the level of each bit is determined by the csto bit in the connection memory. see external drive control section. pin description (continued) pin # name description 84 plcc 100 mqfp 100 lqfp 120 bga
mt90823 data sheet 8 zarlink semiconductor inc. device overview the mt90823 large digital switch is capable of switching up to 2,048 2,048 channels. the mt90823 is designed to switch 64 kb/s pcm or n x 64 kb/s data. the device ma intains frame integrity in dat a applications and minimum throughput delay for voice applic ations on a per channel basis. the serial input streams of the mt90823 can have a bit rate of 2.048, 4.096 or 8. 192 mbit/s and are arranged in 125 s wide frames, which contain 32, 64 or 128 channel s, respectively. the data rates on input and output streams are identical. by using zarllink?s message mode capa bility, the microprocessor can acce ss input and output time-slots on a per channel basis. this feature is useful for transferring control and status information for exte rnal circuits or other st- bus devices. the mt90823 automatically identifies the pola rity of the frame synchronization input signal and configures its serial streams to be comp atible to either st-bus or gci formats. two different microprocessor bus interfaces can be sele cted through the input mode pi n (im): non-multiplexed or multiplexed. these interfaces provid e compatibility with multiplexed and mo torola multiplexed/non-multiplexed buses. the frame offset calibration function allows users to me asure the frame offset delay using a frame evaluation pin (fe). the input offset delay can be prog rammed for individual streams using in ternal frame input offset registers, see table 11. the internal loopback allows the st-bus output data to be looped around to the st-bus inputs for diagnostic purposes. 76 57 54 b11 ode output drive enable (5 v tolerant input): this is the output enable control for th e sto0-15 serial outputs. when ode input is low and the osb bit of the ims register is low, sto0-15 ar e in a high impedance state. if this input is high, t he sto0-15 output drivers are enabled. however, each channel may still be put into a high impedance state by using the per channel control bit in the connection memory. 77 - 84 58-65 55 - 62 a11,b10,a10,b9, a9,a8,b8,a7 sto0 - 7 data stream output 0 to 7 (5 v tolerant three-state outputs): serial data output stream. these streams have selectable data rates of 2.048, 4.096 or 8.192 mb/s. -1 - 4, 27 - 30, 51 - 54 77 - 80 1 - 2, 24 - 27, 49 - 52, 74 - 77, 99 - 100 nc no connection. pin description (continued) pin # name description 84 plcc 100 mqfp 100 lqfp 120 bga
mt90823 data sheet 9 zarlink semiconductor inc. functional description a functional block diagram of the mt90823 is shown in figure 1. data and connection memory for all data rates, the received serial data is converted to parallel format by internal serial-to-parallel converters and stored sequentially in the data memory. depending upon th e selected operation programmed in the interface mode select (ims) register, the useable data memory may be as large as 2,048 bytes. the sequential addressing of the data memory is performed by an internal counter, which is reset by the input 8 khz frame pulse (f0i) to mark the frame boundaries of the incoming serial data streams. data to be output on the serial streams may come from ei ther the data memory or connection memory. locations in the connection memory are associated with particular st -bus output channels. when a channel is due to be transmitted on an st-bus output, the data for this c hannel can be switched either from an st-bus input in connection mode, or from the lower half of the connection memory in message mode. data destined for a particular channel on a serial output stream is read from the data memory or connection memory during the previous channel time-slot. this allows enough time for memory access and parallel-to-serial conversion. connection and message modes in the connection mode, the addresses of the input source data for all output channels are stored in the connection memory. the connection memory is mapped in such a way that each location corresponds to an output channel on the output streams. for details on the use of the sour ce address data (cab and sab bits), see table 13 and table 14. once the source address bits are programmed by the microprocessor, the contents of the data memory at the selected address are transferred to the parallel-to-serial c onverters and then onto an st-bus output stream. by having several output channels connected to the same input source channel, data can be broadcasted from one input channel to several output channels. in message mode, the microprocessor wr ites data to the connection memory locations corresponding to the output stream and channel number. the lower half (8 least si gnificant bits) of the c onnection memory content is transferred directly to the parallel-to-serial converter. this data will be output on the st-bus streams in every frame until the data is changed by the microprocessor. the five most significant bits of the connection memory controls the fo llowing for an output channel: message or connection mode; constant or variable delay; enables/tri state the st-bus output drivers; and, enables/disable the loopback function. in addition, one of these bits allows the user to control the csto output. if an output channel is set to a high-impedance st ate through the connection memory, the st-bus output will be in a high impedance state for th e duration of that channel. in addition to the per-channel c ontrol, all channels on the st-bus outputs can be placed in a high impedanc e state by either pulling the ode input pin low or programming the output standby (osb) bit in the interface mo de selection register to low. this action overrides the individual per-channel programming by the connection memory bits. the connection memory data can be accessed via the micr oprocessor interface through the d0 to d15 pins. the addressing of the device internal r egisters, data and connection memories is performed through the address input pins and the memory select (ms) bit of the control register. for details on de vice addressing, see software control and control register bits des cription (tables 4, 6 and 7). serial data interface timing the master clock frequency must always be twice the data rate. the master clock (clk) must be either at 4.096, 8.192 or 16.384 mhz for serial data ra te of 2.048, 4.096 or 8.192 mb/s resp ectively. the input and output stream data rates will always be identical.
mt90823 data sheet 10 zarlink semiconductor inc. the mt90823 provides two different interface timing modes co ntrolled by the wfps pin. if the wfps pin is low, the mt90823 is in st-bus/gci mode. if the wfps pin is hi gh, the mt90823 is in the wi de frame pulse (wfp) frame alignment mode. in st-bus/gci mode, the input 8 khz frame pulse ca n be in either st-bus or gci format. the mt90823 automatically detects the presence of an input frame pulse and identifies it as either st-bus or gci. in st-bus format, every second falling edge of the master clock mar ks a bit boundary and the data is clocked in on the rising edge of clk, three quarters of the way into the bit cell, see figure 11. in gci format, every second rising edge of the master clock marks the bit boundary and data is clocked in on the falling edge of clk at three quarters of the way into the bit cell, see figure 12. wide frame pulse (wfp) frame alignment timing when the device is in wfp frame al ignment mode, the clk input must be at 16.384 mhz, the fe/hclk input is 4.096 mhz and the 8 khz frame pulse is in st-bus fo rmat. the timing relationshi p between clk, hclk and the frame pulse is defined in figure 13. when the wfps pin is high, the frame a lignment evaluation feature is disabled, but the fram e input offset registers may still be programmed to compens ate for the varying frame delay s on the serial input streams. switching configurations the mt90823 maximum non-blocking switchin g configurations is determined by the data rates selected for the serial inputs and outputs. the switching configuration is selected by two dr bi ts in the ims register. see table 8 nd table 9. 2.048 mb/s serial links (dr0=0, dr1=0) when the 2.048 mb/s data rate is selected, the device is configured with 16-inpu t/16-output data streams each having 32 64 kb/s channels. this mode requires a clk of 4.094 mhz and allows a maximum non-blocking capacity of 512 x 512 channels. 4.096 mb/s serial links (dr0=1, dr1=0) when the 4.096 mb/s data rate is selected, the device is configured with 16-inpu t/16-output data streams each having 64 64 kb/s channels. this mode requires a clk of 8.192 mhz and allows a maximum non-blocking capacity of 1,024 x 1,024 channels. 8.192 mb/s serial links (dr0=0, dr1=1) when the 8.192 mb/s data rate is selected, the device is configured with 16-inpu t/16-output data streams each having 128 64 kb/s channels. this mode requires a cl k of 16.384 mhz and allows a maximum non-blocking capacity of 2,048 x 2,048 channels. table 1 summarizes t he switching configurations and the relationship between different serial data rates and the master clock frequencies.
mt90823 data sheet 11 zarlink semiconductor inc. table 1 - switching configuration input frame offset selection input frame offset selection a llows the channel alignment of individual input streams to be offset with respect to the output stream channel alignment (i.e., f0i). this feature is useful in compensating for variable path delays caused by serial backplanes of variable lengths, which may be implemented in large centralized and distributed switching systems. each input stream can have its own delay offset value by programming the frame inpu t offset (for) registers. possible adjustment can range up to +4 master clock (clk) periods forward with resoluti on of 1/2 clock period. the output frame offset cannot be offset or adjusted. see fi gure 4, table 11 and table 12 for delay offset programming. serial input frame alignment evaluation the mt90823 provides the frame evaluati on (fe) input to determine different dat a input delays with respect to the frame pulse f0i. a measurement cycle is started by setti ng the start frame evaluation (sfe) bit low for at least one frame. then the evaluation starts when the sfe bit in the ims register is changed from low to high. two frames later, the complete frame evaluation (cfe) bit of the frame alignment register (far) changes from low to high. this signals that a valid offset measurement is ready to be read from bits 0 to 11 of the far register. the sfe bit must be set to zero before starting a new measurement cycle. in st-bus mode, the falling edge of the frame measurement signal (fe) is evaluated agai nst the falling edge of the st-bus frame pulse. in gci mode, the rising edge of fe is evaluated against the ri sing edge of the gci frame pulse. see table 10 and figure 3 for the des cription of the frame alignment register. this feature is not available when the wfp frame alignment mode is enabled (i.e., when the wfps pin is connected to vdd). memory block programming the mt90823 provides users with the capability of initia lizing the entire connection memory block in two frames. bits 11 to 15 of every connection memory location will be programmed with the pattern st ored in bits 5 to 9 of the ims register. the block programming mode is enabled by setting the memo ry block program (mbp) bit of the control register high. when the block programming enable (bpe) bit of the ims regi ster is set to high, the block programming data will be loaded into the bits 11 to 15 of every connection memory lo cation. the other connection memory bits (bit 0 to bit 10) are loaded with zeros. when the memory block programming is complete, the device resets the bpe bit to zero. loopback control the loopback control (lpbk) bit of each connection memory location allows the st-bus output data to be looped backed internally to the st-bus input for diagnostic purposes. serial interface data rate master clock required (mhz) matrix channel capacity 2 mb/s 4.096 512 x 512 4 mb/s 8.192 1,024 x 1,024 8 mb/s 16.384 2,048 x 2,048
mt90823 data sheet 12 zarlink semiconductor inc. if the lpbk bit is high, the associated st-bus output c hannel data is internally looped back to the st-bus input channel (i.e., data from sto n channel m will appear in sti n channel m). note: when lpbk is activated in channel m sto n+1 (for n even) or sto n-1 (for n odd), the data from channel m of sti n will be switched to channel m sto n . the associated frame delay offset register must be set to zero for proper operation of the per-channel loopback function. if the lpbk bit is low, the per-channel loopback feature is disabled and the dev ice will function normally. delay through the mt90823 the switching of information from the i nput serial streams to the output seri al streams results in a throughput delay. the device can be programmed to perform time-slot in terchange functions with different throughput delay capabilities on a per-channel basis. for voice application, select variable throughput delay to ensure minimum delay between input and output data. in wideband data appli cations, select constant throughput delay to maintain the frame integrity of the in formation through the switch. the delay through the device varies according to the type of throughput delay selected in the v /c bit of the connection memory. variable delay mode (v /c bit = 0) the delay in this mode is dependent only on the combinati on of source and destinatio n channels. it is independent of input and output streams. the mi nimum delay achievable in the mt90823 is three time-slots. when the input channel data is switched to the same output channel (channel n, frame p), it will be output in the following frame (channel n, frame p+1). the same frame delay occurs if the input channel n is sw itched to output channel n+1 or n+2. when input channel n is switched to output channel n+3, n+ 4,..., the new output data will appear in the same frame. table 2 shows the possible delays fo r the mt90823 in the variable delay mode. constant delay mode (v /c bit = 1) in this mode, frame integrity is maintained in all switchi ng configurations by using a multiple data memory buffer. input channel data written into the data memory buffers during frame n will be read out during frame n+2. in the mt90823, the minimum throughput delay achievable in the constant delay mode is one frame. for example, in 2 mb/s mode, when input time-slot 31 is switched to output time-slot 0. the maximum delay of 94 time-slots occurs when time-slot 0 in a frame is switc hed to time-slot 31 in the frame. see table 3. microprocessor interface the mt90823 provides a parallel microprocessor interface for non-multiplexed or multiplexed bus structures. this interface is compatible with motorola non-multiplexed and multiplexed buses. if the im pin is low, the mt90823 microprocessor interf ace assumes motorola non-multiplexed bus mode. if the im pin is high, the device micro- processor interface acce pts two different timing modes (mode1 and mode2) which allows direct connection to multiplexed microprocessors. the microprocessor interface automatically identifies t he type of microprocessor bu s connected to the mt90823. this circuit uses the level of the ds/rd input pin at the rising edge of as/ale to identify the appropriate bus timing connected to the mt90823. if ds/rd is high at the falling edge of as/al e, then the mode 1 multiplexed timing is selected. if ds/rd is low at the falling edge of as/ale, then the mode 2 multiplexed bus timing is selected.
mt90823 data sheet 13 zarlink semiconductor inc. table 2 - variable throughput delay value table 3 - constant throughput delay value for multiplexed operation, the 8-bit data and address (ad0-ad7), 8-bit data (d8- d15), address strobe/address latch enable (as/ale), data strobe/read (ds/rd ), read/write /write (r/w /wr ), chip select (cs ) and data transfer acknowledge (dta ) signals are required. see figure 13 and figure 14 for mult iplexed parallel microport timing. for the motorola non-multiplexed bus, the 16-bit data bus (ad0-ad7, d8-d15), 8-bit address bus (a0-a7) and 4 control lines (cs , ds, r/w and dta ) signals are required. see figure 15 fo r motorola non- multiplexed microport timing. the mt90823 microport provides access to the internal re gisters, connection and data memories. all locations provide read/write access except for the data memory and the frame alignment re gister which are read only. memory mapping the address bus on the microprocessor interface select s the mt90823 internal regi sters and memory. if the a7 address input is low, then the control (cr), interface mode selection (ims), frame alignment (far) and frame input offset (for) registers are addressed by a6 to a0 as shown in table 4. if the a7 address input is high, t hen the remaining address input lines are used to select up to 128 memory subsection locations. the number selected corresponds to the maximum number of channels per input or output stream. the address input lines and the stream address bits (sta) of the control register allow access to the entire data and connection memories. the control and ims registers together control all the major functions of the device. the im s register should be programmed immediately after system power-up to establish the desired sw itching configuration (see ?serial data interface timing? and ?switching configurations? ). the control register controls switching operations in th e mt90823. it selects the internal memory locations that specify the input and output channels selected for switching. input rate delay for variable throughput delay mode (m - output channel number) (n - input channel number)) m < n m = n, n+1, n+2 m > n+2 2.048 mb/s 32 - (n-m) time-slots m-n + 32 time-slots m-n time-slots 4.096 mb/s 64 - (n-m) time-slots m-n + 64 time-slots m-n time-slots 8.192 mb/s 128 - (n-m) time-slots m-n + 128 time-slots m-n time-slots input rate delay for constant throughput delay mode (m - output channel number) (n - input channel number)) 2.048 mb/s 32 + (32 - n) + (m - 1) time-slots 4.096 mb/s 64 + (64 - n) + (m- 1) time-slots 8.192 mb/s 128 + (128 - n) + (m- 1) time-slots
mt90823 data sheet 14 zarlink semiconductor inc. the data in the control register consists of the memory block programming bit (mbp), the memory select bit (ms) and the stream address bits (sta). the memory bloc k programming bit allows us ers to program the entire connection memory block, (see ?memory bl ock programming? ). the memory select bit controls the selection of the connection memory or the data memory. the stream a ddress bits define an inte rnal memory subsections corresponding to input or output st-bus streams. the data in the ims register consists of block programming bits (bpd0- bpd4), block programming enable bit (bpe), output standby bit (osb), start frame evaluation bit (sfe) and data rate selection bits (dr0, dr1). the block programming and the block programming enable bits allows users to program the entire connection memory, (see memory block programming secti on). if the ode pin is low, the osb bit enable s (if high) or disables (if low) all st- bus output drivers. if the ode pin is high, the contents of the osb bit is ignored and all st-bus output drivers are enabled. connection memory control the contents of the csto bit of each connection memo ry location are output on the csto pin once every frame. the csto pin is a 4.096, 8.192 or 16.384 mb /s output carrying 512, 1,024 or 2,048 bits respectively. if the csto bit is set high, the corresponding bit on the csto output is tr ansmitted high. if the csto bit is low, the corresponding bit on the csto output is transmitted low. the contents of the csto bits of the connection memory are transmitted sequentially via the csto pin and are synchronous with the data rates on the other st-bus streams. the csto bit is output one channel before the corres ponding channel on the st-bus. for example, in 2 mb/s mode, the contents of the csto bit in position 0 (sto0, ch0) of the connection memory is output on the first clock cycle of channel 31 via csto pin. the contents of t he csto bit in position 32 (sto1, ch0) of the connection memory is output on the second clock cycle of channel 31 via csto pin. when either the ode pin or the osb bit is high, the oe bit of each connection memory location enables (if high) or disables (if low) the output drivers for an individual st-b us output stream and channel. ta ble 5 details this function. the connection memory message channel (mc) bit (if hi gh) enables message mode in the associated st-bus output channel. when message mode is enabled, only the lo wer half (8 least significant bits) of the connection memory is transferred to the st-bus outputs. if the mc bit is low, the content s of the connection memo ry stream address bit ( sab) and channel address bit (cab) defines the source information (stream and channel ) of the time-slot that will be switched to the output. bit v /c (variable/constant delay) of each connection memory location allows the per-channel selection between variable and constant throughput delay modes. the loopback bit should be used for diagnostic purpose only; this bit should be set to ze ro for normal operation. if all lpbk bits are set high for all connection memory locations, the associated st-bus output channel data is internally looped back to the st-b us input channel (i.e., sto n channel m data loops back to sti n channel m ).
mt90823 data sheet 15 zarlink semiconductor inc. table 4 - internal register and address memory mapping table 5 - output high impedance control if the lpbk bit is low, the loopback feature is disabled. for proper per-channel loopback op eration, the contents of the frame delay offset registers must be set to zero. a7 (note 1) a6 a5 a4 a3 a2 a1 a0 location 0 0 0 0 0 0 0 0 control register, cr 0 0 0 0 0 0 0 1 interface mode selection register, ims 0 0 0 0 0 0 1 0 frame alignment register, far 0 0 0 0 0 0 1 1 frame input offset register 0, for0 0 0 0 0 0 1 0 0 frame input offset register 1, for1 0 0 0 0 0 1 0 1 frame input offset register 2, for2 0 0 0 0 0 1 1 0 frame input offset register 3, for3 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 . 1 1 0 0 . 1 1 0 0 . 1 1 0 0 . 1 1 0 1 . 0 1 ch 0 ch 1 . ch 30 ch 31 (note 2) 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 0 0 . 1 1 0 0 . 1 1 0 0 . 1 1 0 0 . 1 1 0 1 . 0 1 ch 32 ch 33 . ch 62 ch 63 (note 3) 1 1 1 1 1 1 1 1 1 1 0 0 . 1 1 0 0 . 1 1 0 0 . 1 1 0 0 . 1 1 0 0 . 1 1 0 1 . 0 1 ch 64 ch 65 . ch 126 ch 127 (note 4) notes: 1. bit a7 must be high for access to data and connection memory positions. bit a7 must be low for access to registers. 2. channels 0 to 31 are used when serial interface is at 2mb/s mode. 3. channels 0 to 63 are used when serial interface is at 4mb/s mode. 4. channels 0 to 127 are used when serial interface is at 8mb/s mode. oe bit in connection memory ode pin osb bit in ims register st-bus output driver status 0 don?t care don?t care per channel high impedance 1 0 0 high impedance 1 0 1 enable 1 1 don?t care enable
mt90823 data sheet 16 zarlink semiconductor inc. initialization of the mt90823 during power up, the trst pin should be pulsed low, or held low conti nuously, to ensure that the mt90863 is in the normal functional mode. a 5k pull-down resistor can be connected to this pin so that the device will not enter the jtag test mode during power up. upon power up, the contents of the connection memory c an be in any state and the ode pin should be held low to keep all st-bus outputs in a high impedance state until t he microprocessor has initiali zed the switching matrix. to prevent two st-bus outputs from driving the same st ream simultaneously, the microprocessor should program the desired active paths through the switch and put al l other channels into a high impedance state during the initialization routine by using the block programming mode. in addition, the loopback bits in the connection memory should be cleared for normal operation. when this process is complete, the microprocessor contro lling the matrices can bring the ode pin or osb bit high to relinquish the high impedance state control to the oe bit in the connection memory. table 6 - control (cr) register bits table 7 - valid address lines for different bit rates bit name description 15 - 6 unused must be zero for normal operation. 5mbp memory block program. when 1, the connection me mory block programming feature is ready for t he programming of connection memory high bits, bit 11 to bit 15. when 0, this feature is disabled. 4ms memory select. when 0, connection memory is select ed for read or write operations. when 1, the data memory is selected for read operations and connection memory is selected for write operations. (no microprocessor write operation is allowed for the data memory.) 3 - 0 sta3-0 stream address bits . the binary value expressed by thes e bits refers to the input or output data stream, which corresponds to th e subsection of memory made accessible for subsequent operations. (sta3 = msb, sta0 = lsb) input/output data rate valid address lines 2.048 mb/s a4, a3, a2, a1, a0 4.096 mb/s a5, a4, a3, a2, a1, a0 8.192 mb/s a6, a5, a4 a3, a2, a1, a0 read/write address: 00 h , reset value: 0000 h . 76543210 8 9 10 11 12 13 sta0 sta1 sta2 sta3 14 15 ms mbp 0 0 0 0 0 0 0 0 0 0
mt90823 data sheet 17 zarlink semiconductor inc. table 8 - interface mode selection (ims) register bits table 9 - serial data rate selection (16 input x 16 output) bit name description 15-10 unused must be zero for normal operation. 9-5 bpd4-0 block programming data. these bits carry the value to be loaded into the connection memory block whenever the memory block programming feature is activated. after the mbp bit in the control register is set to 1 and the bpe bit is set to 1, the contents of the bits bpd4- 0 are load ed into bit 15 to bit 11 of the connection memory. bit 10 to bit 0 of the connection memory are set to 0. 4 bpe begin block programming enable. a zero to one transition of this bit enables the memory block programming function. the bp e and bpd4-0 bits in the ims register have to be defined in the same write opera tion. once the bpe bit is set high, the device requires two frames to comple te the block programming. after the programming function has fini shed, the bpe bit returns to zero to indicate the operation is completed. when the bpe = 1, the bpe or mbp can be set to 0 to abort the programming operation. when bpe = 1, the other bits in the ims register must not be changed for two frames to ensure proper operation. 3osb output standby. when ode = 0 and osb = 0, the output drivers of sto0 to sto15 are in high impedance mode. when ode = 0 and osb = 1, the output driver of sto0 to sto15 function normally. when ode = 1, sto0 to sto15 output drivers function normally. 2sfe start frame evaluation. a zero to one transition in this bit starts the frame evaluation procedure. when the cfe bit in the far register changes from zero to one, the evaluation procedure stops. to start another frame evaluation cycle, set this bit to zero for at least one frame. 1 - 0 dr1-0 data rate select. input/output data rate selection. see table 9 for detailed programming. dr1 dr0 data rate selected master clock required 0 0 2.048 mb/s 4.096 mhz 0 1 4.096 mb/s 8.192 mhz 1 0 8.192 mb/s 16.384 mhz 1 1 reserved reserved r ea d/w r it e add ress: 01 h , reset value: 0000 h . 76543210 8 9 10 11 12 13 dr0 dr1 bpd bpd bpd 0 14 15 bpd 0 bpd bpe osb sfe 32 10 0 0 0 0 4
mt90823 data sheet 18 zarlink semiconductor inc. table 10 - frame alignment (far) register bits bit name description 15 - 13 unused must be zero for normal operation. 12 cfe complete frame evaluation. when cfe = 1, the frame evaluation is completed and bits fd10 to fd0 bits contains a valid frame alignment offset. this bit is reset to zero, when sfe bit in the ims register is changed from 1 to 0. 11 fd11 frame delay bit 11. the falling edge of fe (or rising edge for gci mode) is sampled during the clk-high phase (fd1 1 = 1) or during the clk-low phase (fd11 = 0). this bit allows the measurement resolution to 1/2 clk cycle. 10 - 0 fd10-0 frame delay bits. the binary value expressed in these bits refers to the measured input offset value. these bits are reset to zero when the sfe bit of the ims register changes from 1 to 0. (fd10 = msb, fd0 = lsb) r ea d add ress: 02 h , reset value: 0000 h . 76543210 8 9 10 11 12 13 fd0 fd1 fd2 fd3 fd4 fd5 fd6 fd7 fd8 fd9 fd10 fd11 cfe 0 0 0 14 15
mt90823 data sheet 19 zarlink semiconductor inc. figure 4 - example for frame alignment measurement st-bus frame fe input gci frame fe input (fd11 = 0, sample at clk low phase) (fd11 = 1, sample at clk high phase) (fd[10:0] = 09 h ) offset value (fd[10:0] = 06 h ) 1 0 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 offset value 1 0 2 3 4 5 6 7 8 9 10 11 12 13 14 15 clk clk
mt90823 data sheet 20 zarlink semiconductor inc. table 11 - frame input offset (for) register bits name (note 1) description ofn2, ofn1, ofn0 offset bits 2,1 & 0. these three bits define how long t he serial interface receiver takes to recognize and store bit 0 from the sti input pin: i.e., to start a new frame. the input frame offset can be selected to +4 clock periods from the point where the external frame pulse input signal is applied to the f0i input of the device. see figure 4. dlen data latch edge. st-bus mode:dlen =0, if clock rising edge is at the 3/4 point of the bit cell. dlen =1, if when clock falling edge is at the 3/4 of the bit cell. gci mode:dlen =0, if clock falling edge is at the 3/4 point of the bit cell. dlen =1, if when clock rising edge is at the 3/4 of the bit cell. note 1: n denotes an input stream number from 0 to 15. read/write address: 03 h for for0 register, 04 h for for1 register, 05 h for for2 register, 06 h for for3 register, reset value: 0000 h for all for registers. 76543210 8 9 10 11 12 13 dle0 of00 of01 of02 14 15 dle1 of10 of11 of12 dle2 of20 of21 of22 dle3 of30 of31 of32 for0 register for1 register 76543210 8 9 10 11 12 13 dle4 of40 of41 of42 14 15 dle5 of50 of51 of52 dle6 of60 of61 of62 dle7 of70 of71 of72 for2 register 76543210 8 9 10 11 12 13 dle8 of80 of81 of82 14 15 dle9 of90 of91 of92 dle10 of100 of101 of102 dle11 of110 of111 of112 for3 register 76543210 8 9 10 11 12 13 dle12 of120 of121 of122 14 15 dle13 of130 of131 of132 dle14 of140 of141 of142 dle15 of150 of151 of152
mt90823 data sheet 21 zarlink semiconductor inc. table 12 - offset bits (ofn2, ofn1, ofn0, dlen) and frame delay bits (fd11, fd2-0) figure 5 - examples for input offset delay timing input stream offset measurement result from frame delay bits corresponding offset bits fd11 fd2 fd1 fd0 ofn2 ofn1 ofn0 dlen no clock period shift (default) 1 0 0 0 0 0 0 0 + 0.5 clock period shift 0 0 0 0 0 0 0 1 +1.0 clock period shift 1 0 0 1 0 0 1 0 +1.5 clock period shift 0 0 0 1 0 0 1 1 +2.0 clock period shift 1 0 1 0 0 1 0 0 +2.5 clock period shift 0 0 1 0 0 1 0 1 +3.0 clock period shift 1 0 1 1 0 1 1 0 +3.5 clock period shift 0 0 1 1 0 1 1 1 +4.0 clock period shift 1 1 0 0 1 0 0 0 +4.5 clock period shift 0 1 0 0 1 0 0 1 st-bus f0i clk sti stream sti stream sti stream sti stream gci f0i clk input stream input stream input stream input stream offset=0, dle=0 offset=1, dle=0 offset=0, dle=1 offset=1, dle=1 offset=0, dle=0 offset=1, dle=0 offset=0, dle=1 offset=1, dle=1 denotes the 3/4 point of the bit cell bit 7 bit 7 bit 7 bit 7 bit 0 bit 0 bit 0 bit 0 denotes the 3/4 point of the bit cell
mt90823 data sheet 22 zarlink semiconductor inc. table 13 - connection memory bits table 14 - cab bits programming for different data rates bit name description 15 lpbk per channel loopback. this bit should be use for diagnostic purpose only. set this bit to zero for normal operation. when loopback bit is set for all memory location, the sti n channel m data comes from sto n channel m . for proper per channel loopback operations, set the delay offset register bits ofn[2:0] to zero for the streams which are in the loopback mode. 14 v /c variable /constant throughput delay. this bit is used to select between the variable (low) and the constant delay (high) modes on a per-channel basis. 13 mc message channel. when 1, the contents of the connection memory are output on the corresponding output channel and stream. only the lower byte (bit 7 - bit 0) will be output to the st-bus output pins. when 0, the contents of the connection memory are the data me mory address of the switched input channel and stream. 12 csto control st-bus output. this bit is output on the csto pin one channel early. the csto bit for stream 0 is output first. 11 oe output enable. this bit enables the st-bus output drivers on a per-channel basis. when 1, the output driver functions normal ly. when 0, the output driver is in a high-impedance state. 10 - 8, 7 (note 1) sab3-0 source stream address bits. the binary value is the number of the data stream for the source of the connection. 6 - 0 (note 1) cab6-0 source channel address bits. the binary value is the number of the channel for the source of the connection. note 1: if bit 13 (mc) of the corresponding connection memory location is 1 (device in message mode), then these entire 8 bits (sab0, cab6 - cab0) are output on the output chan nel and stream associated with this location. data rate cab bits used to determine the source channel of the connection 2.048 mb/s cab4 to cab0 (32 channel/input stream) 4.096 mb/s cab5 to cab0 (64 channel/input stream) 8.192 mb/s cab6 to cab0 (128 channel/input stream) 76543210 8 9 10 11 12 13 cab0 cab1 cab2 cab6 sab0 cab3 cab4 cab5 sab1 sab2 sab3 oe csto 14 v /c 15 mc lpbk
mt90823 data sheet 23 zarlink semiconductor inc. jtag support the mt90823 jtag interface conforms to the ieee 1149. 1 boundary-scan standard and the boundary-scan test (bst) design-for-testability tech nique it specifies. the oper ation of the boundary-scan circuitry is controlled by an external test access port (tap) controller. test access port (tap) the test access port (tap) provides access to the many test functions of the mt90823. it consists of three input pins and one output pin. the fo llowing pins comprise the tap. ? test clock input (tck) tck provides the clock for the test logic. the tc k does not interfere with any on-chip clock and thus remains independent. the tck permits shifting of test data into or out of the boundary-scan register cells concurrently with the operation of the device and without interfering with the on-chip logic. ? test mode select input (tms) the logic signals received at the tms input are interpreted by the tap controller to control the test operations. the tms signals are sampled at the rising e dge of the tck pulse. this pin is internally pulled to vdd when it is not driven from an external source. ? test data input (tdi) serial input data applied to this port is fed either into the instruction register or into a test data register, depending on the sequence previously applied to th e tms input. both registers are described in a subsequent section. the received input data is samp led at the rising edge of tck pulses. this pin is internally pulled to vdd when it is not driven from an external source. ? test data output (tdo) depending on the sequence previously applied to the tms input, the contents of either the instruction register or data register are serially shifted out towa rds the tdo. the data out of the tdo is clocked on the falling edge of the tck pulses. when no data is shifted through the boundary scan cells, the tdo driver is set to a high impedance state. ? test reset (trst ) resets the jtag scan structure. this pin is internally pulled to vdd. instruction register in accordance with the ieee 1149.1 standard, the mt90823 uses public instructions. the mt90823 jtag interface contains a three-bit instructi on register. instructions are serially loaded into the instruction register from the tdi when the tap controller is in its shif ted-ir state. subsequently, the instruct ions are decoded to achieve two basic functions: to select the test data regi ster that may operate while the instru ction is current, and to define the serial test data register path, which is used to shift dat a between tdi and tdo duri ng data register scanning.
mt90823 data sheet 24 zarlink semiconductor inc. test data register as specified in ieee 11 49.1, the mt90823 jtag interface cont ains three test data registers: ? the boundary-scan register the boundary-scan register consists of a series of boundary-scan cells arranged to form a scan path around the boundary of the mt90823 core logic. ? the bypass register the bypass register is a single stage shift register that provides a one-bit path from tdi to its tdo. ? the device identification register the device identification register is a 32-bit register with the register contain of: the lsb bit in the device identification register is the first bit clocked out. the mt90823 boundary scan register contains 118 bits. bit 0 in table 15 boundary scan register is the first bit clocked out. all tristate enable bits are active high. msb lsb 0000 0000 1000 0010 0011 0001 0100 1011
mt90823 data sheet 25 zarlink semiconductor inc. device pin boundary scan bit 0 to bit 117 tristate control output scan cell input scan cell sto7 sto6 sto5 sto4 sto3 sto2 sto1 sto0 0 2 4 6 8 10 12 14 1 3 5 7 9 11 13 15 ode 16 csto 17 18 dta 19 d15 d14 d13 d12 d11 d10 d9 d8 20 23 26 29 32 35 38 41 21 24 27 30 33 36 39 42 22 25 28 31 34 37 40 43 ad7 ad6 ad5 ad4 ad3 ad2 ad1 ad0 44 47 50 53 56 59 62 65 45 48 51 54 57 60 63 66 46 49 52 55 58 61 64 67 im 68 as/ale 69 cs 70 r/w / wr 71 ds/rd 72 table 14 - boundary scan register bits
mt90823 data sheet 26 zarlink semiconductor inc. a7 a6 a5 a4 a3 a2 a1 a0 73 74 75 76 77 78 79 80 wfps 81 reset 82 clk 83 fe/hclk 84 f0i 85 sti15 sti14 sti13 sti12 sti11 sti10 sti9 sti8 sti7 sti6 sti5 sti4 sti3 sti2 sti1 sti0 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 sto15 sto14 sto13 sto12 sto11 sto10 sto9 sto8 102 104 106 108 110 112 114 116 103 105 107 109 111 113 115 117 device pin boundary scan bit 0 to bit 117 tristate control output scan cell input scan cell table 14 - boundary scan register bits (continued)
mt90823 data sheet 27 zarlink semiconductor inc. applications switch matrix architectures the mt90823 is an ideal device for medium to large si ze switch matrices where voice and grouped data channels are transported within the same frame. in such applicat ions, the voice samples have to be time interchanged with a minimum delay while maintaining the integrity of groupe d data. to ensure the integrity of grouped data during switching and to provide a minimum delay for voice co nnections, the mt90823 provides per-channel selection between variable and constant throughput delay. this can be selected by the v /c bit of the connection memory. figure 6 illustrates how four mt90823 devices can be used to form non-blocking switches for up to 4096 channels with data rate of 8.192 mb/s. serial input frame alignment evaluation the mt90823 is capable of performing frame alignment ev aluation. the frame pulse under evaluation is connected to the fe (frame measurement) pin. an external multiple xer is required to select one of the frame pulses related to the different input streams. figure 7 - the block diagram at figure 7 shows a switch matrix that performs frame alignment evaluation for 16 frame pulses. figure 6 - switch matrix with seri al stream at various bit rates 16 streams in 16 streams out 16 streams 16 streams mt90823 #1 mt90823 #2 mt90823 #3 mt90823 #4 2.048 mb/s 1,024 - channel switch 4.096 mb/s 2,048 - channel switch 4,096 - channel switch 8.192 mb/s bit rate (in/out) size of switch matrix
mt90823 data sheet 28 zarlink semiconductor inc. figure 7 - serial input frame alignmen t evaluation for various frame pulses wide frame pulse (wfp) frame alignment mode when the device is in the wide frame pulse mode and if the input data streams are sa mpled at 3/4 bit time, the device can operate in the hmvip and mv ip-90 environment. when input data st reams are sampled at half-bit time as specified in the hmvip and mvip-90 standard, the device can only operate with data rate of 2 mb/s. refer to the st-bus output delay parameter, t sod , as specified in the ac electrical characteristic table. the mt90823 is designed to accept a common frame pulse f0i, the 4.096 mhz and 16.384 mhz clocks required by the hmvip standards. to enable the wi de frame pulse frame alignment mode, the wfps pin has to be set to high and the dr1 and dr0 bits set for 8.192m b/s data rate operation. digital access cross-connect system figure 8 illustrates the use of mt90823 devices to c onstruct a 256 e1/t1 digital access cross- connect system (dacs). the system consists of 32 trunk cards each having ei ght e1 or t1 trunk interfaces for a total of 256 trunks. each trunk card uses two mt8986 multi-rate digital switches. the central switching block uses 16 mt90823 devices. the block diagram at figure 9 shows how an 8,192 x 8, 192 channel switch can be constructed from 4,096 x 4,096 channel switch modules. figure 6 shows the implementat ion of the individual 4,096 x 4,096 channel switch modules from four mt90823 devices. figure 10 shows an eight-stream trunk card using mt8986 multi-rate digital switches to concentrate 32-channel 2.048 mb/s st-bus (dsti and dsto) streams at each e1 /t1 trunk onto four 128-channel 8.192 mb/s streams. the dacs switching matrix that formerly required 256 mt898 6 devices in a square (16 x 16) configuration can now be provided by 64 mt8986 and 16 mt90823 devices (see figure 8). sti0 sto[0:15] sti1 sti2 sti15 frame alignment evaluation circuit central timing source fe input clk fp fp sti15 fp sti0 fp sti1 fp sti2 external mux mt90823 note: 1. use the external mux to select one of the serial frame pulses. 2. to start a measurement cycle, set the start frame evaluation (sfe) bit in the ims register low for at least 1 frame. 3. frame evaluation starts when the sfe bit is changed from low to high. 4. two frames later, the complete frame evaluation (cfe) bit of the frame alignment register (far) changes from low to high to signal the cpu that a valid offset measurement is ready to be read from bit [11:0] of the far register. 5. the sfe bit must be set to zero before a new measurement cycle started.
mt90823 data sheet 29 zarlink semiconductor inc. figure 8 - 256 e1/t1 digital acc ess cross-connect system (dacs) figure 9 - 8,192 x 8,192 channel switch matrix 8 x e1/t1 trunk card e1 0 e1 7 8 x e1/t1 trunk card e1 8 tc1 e1 15 8 x e1/t1 trunk card e1 247 tc31 e1 255 64 input streams x 64 output streams sixteen mt90823 (8 mb/s mode) 8,192 x 8,192 channel switch matrix (see figure 9) (figure 10) 128 channels at 8.192 mb/s each line represents a stream tc0 that consists of in 32 streams 32 streams 4,096 x 4,096 switch matrix 4,096 x 4,096 switch matrix 4,096 x 4,096 switch matrix 4,096 x 4,096 switch matrix (figure 6) out 32 streams 32 streams (figure 6) (figure 6) (figure 6)
mt90823 data sheet 30 zarlink semiconductor inc. figure 10 - trunk card block diagram * exceeding these values may cause permanent damage. functional operation under these conditions is not implied absolute maximum ratings* parameter sym. min. max. units 1 supply voltage v dd -0.3 5.0 v 2 voltage on any 3.3 v tolerant pi n i/o (other than supply pins) v i v ss - 0.3 v dd + 0.3 v 3 voltage on any 5 v tolerant pin i/o (other than supply pins) v i v ss - 0.3 5.5 v 4 continuous current at digital outputs i o 20 ma 5 package power dissipation (plcc & pqfp) p d 1w 6 storage temperature t s - 65 +125 c recommended operating conditions - voltages are with respect to ground (v ss ) unless otherwise stated. characteristics sym. min. typ. max. units test conditions 1 operating temperature t op -40 +85 c 2 positive supply v dd 3.0 3.6 v 3 input high voltage v ih 0.7v dd v dd v 400 mv noise margin 4 input high voltage on 5 v tolerant inputs v ih 5.5 v 5 input low voltage v il v ss 0.3v dd v 400 mv noise margin e1 0 e1 1 e1 7 e1/t1 trunk 0 e1/t1 trunk 1 e1/t1 trunk 7 sti0 sti1 sti7 sto0 sto1 sto7 mt8986 2 mb/s to 8 mb/s mt8986 8 mb/s to 2 mb/s sto0 sto1 sti0 sti1 256-channel out (8.192 mb/s per channel) 256-channel in dsto dsti dsto dsti dsto dsti (8.192 mb/s per channel)
mt90823 data sheet 31 zarlink semiconductor inc. note: 1. maximum leakage on pins (output or i/o pins in high impedance state) is over an applied voltage (v) dc electrical characteristics - voltages are with respect to ground (v ss ) unless otherwise stated. characteristics sym. min. typ. max. units test conditions 1 i n p u t s supply current @ 2 mb/s i dd 12 15 ma output unloaded @ 4 mb/s 20 26 ma @ 8 mb/s 45 70 ma 2 input high voltage v ih 0.7v dd v 3 input low voltage v il 0.3v dd v 4 input leakage (input pins) input leakage (with pull-up or pull- down) i il i bl 15 50 a a0 mt90823 data sheet 32 zarlink semiconductor inc. ac electrical characteristics - frame pulse and clk characteristic sym. min. typ. max. units notes 1 frame pulse width (st-bus, gci) bit rate = 2.048 mb/s bit rate = 4.096 mb/s bit rate = 8.192 mb/s t fpw 26 26 26 295 145 80 ns ns ns wfps pin = 0 2 frame pulse setup time before clk falling (st-bus or gci) t fps 5 ns wfps pin = 0 3 frame pulse hold time from clk falling (st-bus or gci) t fph 10 ns wfps pin = 0 4clk period bit rate = 2.048 mb/s bit rate = 4.096 mb/s bit rate = 8.192 mb/s t cp 190 110 55 300 150 70 ns ns ns wfps pin = 0 5 clk pulse width high bit rate = 2.048 mb/s bit rate = 4.096 mb/s bit rate = 8.192 mb/s t ch 85 50 20 150 75 40 ns ns ns wfps pin = 0 6 clk pulse width low bit rate = 2.048 mb/s bit rate = 4.096 mb/s bit rate = 8.192 mb/s t cl 85 50 20 150 75 40 ns ns ns wfps pin = 0 7 clock rise/fall time t r , t f 10 ns 8 wide frame pulse width bit rate = 8.192 mb/s t hfpw 195 295 ns wfps pin = 1 9 frame pulse setup time before hclk falling t hfps 5 150 ns wfps pin = 1 10 frame pulse hold time from hclk falling t hfph 10 150 ns wfps pin = 1 11 hclk (4.096mhz) period bit rate = 8.192 mb/s t hcp 190 300 ns wfps pin = 1 12 hclk (4.096mhz) pulse width high bit rate = 8.192 mb/s t hch 85 150 ns wfps pin = 1 13 hclk (4.096mhz) pulse width low bit rate = 8.192 mb/s t hcl 85 150 ns wfps pin = 1 14 hclk rise/fall time t hr , t hf 10 ns 15 delay between falling edge of hclk and falling edge of clk t dif -10 10 ns wfps pin = 0 or 1
mt90823 data sheet 33 zarlink semiconductor inc. note: 1. high impedance is me asured by pulling to th e appropriate rail with r l , with timing corrected to canc el time taken to discharge c l . figure 11 - st-bus timing for 2.048 mb/s and high speed serial interface at 4.096 mb/s or 8.192 mb/s, when wfps pin = 0. ac electrical characteristics - serial streams for st-bus and gci backplanes characteristic sym. min. typ. m ax. units test conditions 1 sti set-up time t sis 0ns 2sti hold time t sih 10 ns 3 sto delay - active to active t sod 30 40 ns ns c l =30pf c l =200pf 4 sto delay - active to high-z t dz 32 r l =1k, c l =200pf, see note 1 5 sto delay - high-z to active t zd 32 r l =1k, c l =200pf, see note 1 6 output driver enable (ode) delay t ode 32 ns r l =1k, c l =200pf, see note 1 7 csto output delay t xcd 30 40 ns ns c l =30pf c l =200pf v ct v ct f0i clk t fpw sto sti t fph t sod t sih t ch t cl bit 0, last ch (note1) 2.048 mb/s mode, last channel = ch 31, 4.196 mb/s mode, last channel = ch 63, 8.192 mb/s mode, last channel = ch 127. t fps t cp t sis v tt v ct bit 7, channel 0 bit 6, channel 0 bit 5, channel 0 bit 0, last ch (note1) bit 7, channel 0 bit 6, channel 0 bit 5, channel 0 note 1: v hm v lm t r t f
mt90823 data sheet 34 zarlink semiconductor inc. figure 12 - gci timing at 2.048 mb /s and high speed serial interface at 4.096 mb/s or 8.192 mb/s, when wfps pin = 0 figure 13 - wfp bus timing for high speed seri al interface (8.192 mb/s), when wfps pin = 1 note: 1. high impedance is me asured by pulling to th e appropriate rail with r l , with timing corrected to canc el time taken to discharge c l . 2 mb/s mode, last channel = ch 31, 4 mb/s mode, last channel = ch 63, 8 mb/s mode, last channel = ch 127 v ct v ct f0i clk t fpw sto sti t fph t sod t sih t ch t cl bit 7, last ch (note1) t fps t cp t sis v ct v ct bit 0, channel 0 bit 1, channel 0 bit 2, channel 0 bit 7, last ch (note1) bit 0, channel 0 bit 1, channel 0 bit 2, channel 0 note 1: t r t f v hm v lm v ct f0i hclk 4.096mhz t hfpw t hfph t hfps t hcl t hch t dif t hcp v ct clk sto sti t sod t sih t ch t cp t sis v ct v ct v hm v lm t r t f t hf t hr t cl v ct bit 7, ch 0 bit 6, ch 0 bit 5, ch 0 bit 4, ch 0 bit 0, ch 127 bit 1, ch 127 bit 7, ch 0 bit 6, ch 0 bit 5, ch 0 bit 4, ch 0 bit 0, ch 127 bit 1, ch 127 16.384mhz
mt90823 data sheet 35 zarlink semiconductor inc. figure 14 - serial output and external control figure 15 - output driver enable (ode) (gci mode) t dz clk sto t zd sto t xcd csto clk (st-bus or) (wfps mode) v ct v ct v ct hiz valid data v ct hiz valid data v ct v ct hiz hiz sto ode t ode t ode valid data v ct
mt90823 data sheet 36 zarlink semiconductor inc. note: 1. high impedance is measured by pulling to the appro priate rail with r l , with timing corrected to cancel time taken to discharge c l . ac electrical characteristics - multiplexed bus timing (mode 1) characteristics sym. min. typ. max. units test conditions 1 ale pulse width t alw 20 ns 2 address setup from ale falling t ads 3ns 3 address hold from ale falling t adh 3ns 4rd active after ale falling t alrd 3ns 5 data setup from dta low on read t ddr 5nsc l =150pf 6cs hold after rd /wr t csrw 5ns 7rd pulse width (fast read) t rw 45 ns 8cs setup from rd t csr 0ns 9 data hold after rd t dhr 10 20 ns c l =150pf, r l =1k, note 1. 10 wr pulse width (fast write) t ww 45 ns 11 wr delay after ale falling t alwr 3ns 12 cs setup from wr t csw 0ns 13 data setup from wr (fast write) t dsw 20 ns 14 valid data delay on write (slow write) t swd 122 ns 15 data hold after wr inactive t dhw 5ns 16 acknowledgment delay: reading/writing registers reading/writing memory @ 2mb/s @ 4mb/s @ 8mb/s t akd 43/43 760/750 400/390 220/210 ns ns ns ns c l =150pf c l =150pf c l =150pf c l =150pf 17 acknowledgment hold time t akh 22 ns c l =150pf, r l =1k, note 1.
mt90823 data sheet 37 zarlink semiconductor inc. figure 16 - multiplexed bus timing (mode 1) v ct hiz ale ad0-ad7 cs rd wr dta address data t alw t ads t adh t alrd t csr t alwr t swd t akd t ddr t akh t csrw t dhw t dsw d8-d15 t csw hiz hiz t dhr t ww t rw v ct v ct v ct v ct v ct
mt90823 data sheet 38 zarlink semiconductor inc. note 1. high impedance is measured by pulling to the appropriate rail with r l , with timing corrected to cancel time taken to discharge c l . ac electrical characteristics - mu ltiplexed bus timing (mode 2) characteristics sym. min. typ. max. units test conditions 1 as pulse width t asw 20 ns 2 address setup from as falling t ads 3ns 3 address hold from as falling t adh 3ns 4 data setup from dta low on read t ddr 5nsc l =150pf 5cs hold after ds falling t csh 0ns 6cs setup from ds rising t css 0ns 7 data hold after write t dhw 5ns 8 data setup from ds -write (fast write) t dws 20 ns 9 valid data delay on write (slow write) t swd 122 ns 10 r/w setup from ds rising t rws 60 ns 11 r/w hold after ds falling t rwh 5ns 12 data hold after read t dhr 10 20 ns c l =150pf, r l =1k, note 1 13 ds delay after as falling t dsh 10 ns 14 acknowledgment delay: reading/writing registers reading/writing memory @ 2mb/s @ 4mb/s @ 8mb/s t akd 43/43 760/750 400/390 220/210 ns ns ns ns c l =150pf c l =150pf c l =150pf c l =150pf 15 acknowledgment hold time t akh 22 ns c l =150pf, r l =1k, note 1
mt90823 data sheet 39 zarlink semiconductor inc. figure 17 - multiplexed bus timing (mode2) v ct v ct ds r/w as ad0-ad7 ad0-ad7 dta t rws t akd t asw t dsh t rwh t ads t adh t dws t dhw d8-d15 d8-d15 t css t dhr t csh cs t ddr t akh wr rd t sw v ct hiz hiz address data hiz hiz address v ct v ct v ct v ct data
mt90823 data sheet 40 zarlink semiconductor inc. note: 1. high impedance is measured by pulling to th e appropriate rail with r l , with timing corrected to cancel time taken to discharge c l . ac electrical characteristics - motorola non-multiplexed bus mode characteristics sym. min. typ. max. units test conditions 1cs setup from ds falling t css 0ns 2r/w setup from ds falling t rws 10 ns 3 address setup from ds falling t ads 2ns 4cs hold after ds rising t csh 0ns 5r/w hold after ds rising t rwh 2ns 6 address hold after ds rising t adh 2ns 7 data setup from dta low on read t ddr 2nsc l =150pf 8 data hold on read t dhr 10 20 ns c l =150pf, r l =1k note 1 9 data setup on writ e (fast write) t dsw 0ns 10 valid data delay on write (slow write) t swd 122 ns 11 data hold on write t dhw 5ns 12 acknowledgment delay: reading/writing registers reading/writing memory @ 2mb/s @ 4mb/s @ 8mb/s t akd 43/43 760/750 400/390 220/210 ns ns ns ns c l =150pf c l =150pf c l =150pf c l =150pf 13 acknowledgment hold time t akh 22 ns c l =150pf, r l =1k, note 1
mt90823 data sheet 41 zarlink semiconductor inc. figure 18 - motorola non-multiplexed bus timing ds a0-a7 ad0-ad7 cs d8-d15 ad0-ad7 d8-d15 read write t css t csh t adh t dhr t rws r/w t ads t rwh t dhw t akd t swd t ddr t akh dta v ct v ct v ct v ct v ct v ct v ct t dsw valid address valid read data valid write data

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