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| www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Features * * * * * * * * * * * * * Up to 5.0Gbps PCI Express Gen-2 Serial Re-driver Supporting 8 differential channels or 4 lanes of PCIe Interface Pin strapped and I2C configuration controls (3.3V Tolerant) Adjustable receiver equalization Adjustable transmitter amplitude and de-emphasis Variable input an output termination 1:2 channel broadcast Channel loop-back Electrical Idle fully supported Receiver detect and individual output control Single supply voltage, 1.2V 0.05V Power down modes Packaging: 100-contact LFBGA, Pb-free & Green Description Pericom Semiconductor's PI2EQX5804 is a low power, PCI-express compliant signal re-driver. The device provides programmable equalization, amplification, and de-emphasis by using 8 select bits, to optimize performance over a variety of physical mediums by reducing Inter-symbol interference. PI2EQX5804 supports eight 100-Ohm Differential CML data I/O's between the Protocol ASIC to a switch fabric, across a backplane, or extends the signals across other distant data pathways on the user's platform. The integrated equalization circuitry provides flexibility with signal integrity of the PCI-express signal before the re-driver, whereas the integrated de-emphasis circuitry provides flexibility with signal integrity of the signal after the re-driver. In addition to providing signal re-conditioning, Pericom's PI2EQX5804 also provides power management Stand-by mode operated by a Power Down pin. Block Diagram + - xyRx+ xyRx+ - + Equalizer - xyTx+ xyTxInput level detect to control logic Output Controls Pin Configuration (Top-Side View) 1 2 3 4 5 6 7 8 9 10 A VDD B0TX- B0TX+ VDD SCL SDA VDD B0RX+ B0RX- VDD B A1RX+ GND GND A0RX - DE_A VDD A0TX- GND GND A1TX+ xyTx+ xyTx- + - Output Controls A B Input level detect to control logic Equalizer + - + - C A1RXxyRx+ xyRx- GND GND A0RX+ NC PD# A0TX+ GND GND A1TX - D VDD B1TX+ B1TX- VDD D2_A NC VDD B1RX- B1RX+ VDD Data Lane Repeats 4 Times SELy_x Sy_x Dy_x DE_x PD# SDA SCL Mode E SEL0_A SEL1_A SEL2_A D0_A D1_A S0_A RXD_A S1_A SIG_A RX50_A Control registers & logic Power Management I2C Control LB# RXD_x RES_x F RX50_B SIG_B S1_B RXD_B S0_B A1 SEL2_B LB# SEL1_B SEL0_B G VDD A2RX- A2RX+ VDD MODE D0_B VDD A2TX+ A2TX - VDD H Ax B2TX+ GND GND B3TX- DE_B A0 B3RX - GND GND B2RX+ J B2TX- GND GND B3TX+ RESET# D1_B B3RX+ GND GND B2RX- K VDD A3RX+ A3RX- VDD D2_B A4 VDD A3TX- A3TX+ VDD 08-0218 1 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Pin Name A0RX+, A0RXA0TX+, A0TXA1RX+, A1RXA1TX+, A1TXA2RX+, A2RXA2TX+, A2TXA3RX+, A3RXA3TX+, A3TXB0RX+, B0RXB0TX+, B0TXB1RX+, B1RXB1TX+, B1TXB2RX+, B2RXB2TX+, B2TXB3RX+, B3RXB3TX+, B3TXType I I O O I I O O I I O O I I O O I I O O I I O O I I O O I I O O Description CML inputs for Channel A0, with internal 50-Ohm pull down during normal operation, and >200K-Ohm otherwise. CML outputs for Channel A0, with internal 50-Ohm pull up during normal operation and 2K-Ohm pull up otherwise. CML inputs for Channel A1, with internal 50-Ohm pull down during normal operation, and >200K-Ohm otherwise. CML outputs for Channel A1, with internal 50-Ohm pull up during normal operation and 2K-Ohm pull up otherwise. CML inputs for Channel A2, with internal 50-Ohm pull down during normal operation, and >200K-Ohm otherwise. CML outputs for Channel A2, with internal 50-Ohm pull up during normal operation and 2K-Ohm pull up otherwise. CML inputs for Channel A3 with internal 50-Ohm pull down during normal operation, and >200K-Ohm otherwise. CML outputs for Channel A3, with internal 50-Ohm pull up during normal operation and and 2K-Ohm pull up otherwise. CML inputs for Channel B0, with internal 50-Ohm pull down during normal operation, and >200K-Ohm otherwise. CML outputs for Channel B0, with internal 50-Ohm pull up during normal operation and 2K-Ohm pull up otherwise. CML inputs for Channel B1, with internal 50-Ohm pull down during normal operation, and >200K-Ohm otherwise. CML outputs for Channel B1, with internal 50-Ohm pull up during normal operation and 2K-Ohm pull up otherwise. CML inputs for Channel B2, with internal 50-Ohm pull down during normal operation, and >200K-Ohm otherwise. CML outputs for Channel B2, with internal 50-Ohm pull up during normal operation and 2K-Ohm pull up otherwise. CML inputs for Channel B3, with internal 50-Ohm pull down during normal operation, and >200K-Ohm otherwise. CML outputs for Channel B3, with internal 50-Ohm pull up during normal operation and 2K-Ohm pull up otherwise. I2C programmable address bit A0, A1 and A4. Selection pins for Channel Ax emphasis (See emphasis Configuration Table) w/ 100K-Ohm internal pull up Selection pins for Channel Bx emphasis (See emphasis Configuration Table) w/ 100K-Ohm internal pull up De-emphasis enable input for Channel A0, A1, A2 and A3 with internal 100K-Ohm pull-up resistor. Set high selects output de-emphasis and set low selects output pre-emphasis. 2 PS8926B 09/04/08 Pin # Data Signals C4 B4 C7 B7 B1 C1 B10 C10 G3 G2 G8 G9 K2 K3 K9 K8 A8 A9 A3 A2 D9 D8 D2 D3 H10 J10 H1 J1 J7 H7 J4 H4 Control Signals H6, F6, K6 E4, E5, D5 G6, J6, K5 B5 A0, A1, A4 I D[0:2]_A I D[0:2]_B DE_A I I 08-0218 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis DE_B I De-emphasis enable input for Channel B0, B1, B2 and B3 with internal 100K-Ohm pull-up resistor. Set high selects output de-emphasis and set low selects output pre-emphasis. Input with internal 100K-Ohm pull-up resistor. LB# = High or open for normal operation. LB# = Low for loopback connection of A_RX to A_TX and B_TX. Input switch between pin control and I2C control with internal 100k-ohm pull-up resistor. A LVCMOS high level selects input pin control, and disables I2C operation. Note, during startup, input status of the control pin (LB#, RESET#, PD#, RXD_A/B, SEL02_A/B, D0-2_A/B, S0-1_A/B, DE_A/B) will be latched to the initial state of some I2C control pins only once. Input with internal 100K-Ohm pull-up resistor, PD# =High or open is normal operation, PD# =Low disable the IC, and set IC to power down mode, both input and output go Hi-Z. No Connect No Connect RESET# is an active low channel reset input for Channel A0, B0, A1, B1, A2, B2, A3 and B3 with internal 100K-Ohm pull-up resistor. When low, the receiver detection cycle is reset, and normal detection cycle is started after the pin goes high. Receiver detect output pin for Channel A0. RX50_A=High indicates that a 50-Ohm termination was sensed at the A0TX+/outputs. Receiver detect output pin for Channel B0. RX50_B=High indicates that a 50-Ohm termination was sensed at the B0TX+/outputs. Receiver detect enable input for Channel A0, A1, A2 and A3 with internal 100K-Ohm pull-up resistor. Receiver detect enable input for Channel B0, B1, B2 and B3 with internal 100K-Ohm pull-up resistor. Selection pins for Channel Ax output level (see Output Swing Configuration Table) w/ 100K-Ohm internal pull up Selection pins for Channel Bx output level (see Output Swing Configuration Table) w/ 100K-Ohm internal pull up I2C SCL clock input. Up to 3.3V input tolerance. I2C SDA data input. Up to 3.3V input tolerance Selection pins for Channel Ax equalization (see Equalizer Configuration Table) w/ 100K-Ohm internal pull up H5 F8 LB# I G5 MODE I C6 PD# I D6 C5 J5 NC NC RESET# I E10 RX50_A O F1 RX50_B O E7 F4 E6, E8 F5, F3 A5 A6 E1, E2, E3 RXD_A RXD_B S[0:1]_A S[0:1]_B I I I I SCL I/O SDA I/O SEL[0:2]_A I 08-0218 3 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis SEL[0:2]_B I SIG_A SIG_B O O Selection pins for Channel Bx Equalization (see Equalizer Configuration Table) w/ 100K-Ohm internal pull up Signal detect output pin for Channel A0. SIG_A=High represents a input signal > threshold at the differential inputs. Signal detect output pin for Channel B0. SIG_B=High represents a input signal > threshold at the differential inputs. Supply Ground F10, F9, F7 E9 F2 Power Pins B2, B3, B8, B9, GND C2, C3, C8, C9, H2, H3, H8, H9, J2, J3, J8, J9 PWR A1, A4, A7, A10, B6, D1, D4, D7, D10, G1, G4, G7, G10, K1, K4, K7, K10 VDD PWR 1.2V Supply Voltage DESCRIPTION of OPERATION Configuration Modes Device configuration can be performed in two ways depending on the state of the MODE input. MODE determines whether IC configuration status is from the input pins or via I2C control. When MODE is set high, the configuration input pins set the configuration operating state as stored in configuration registers. While MODE is set high, changes to these control registers are disabled and the initial condition is protected from any changes to insuring a known operating state. When the MODE pin is low, reprogramming of these control registers via I2C is allowed. Note that the MODE pin is not latched, and is always active to enable or disable I2C access. During initial power-on, the value at the configuration input pins: LB#, RESET#, PD#, RXD_A and RXD_B, DE_A, DE_B, SEL0_A, SEL1_A, SEL2_A, D0_A, D1_A, D2_A, S0_A, S1_A, SEL0_B, SEL1_B, SEL2_B, D0_B, D1_B, D2_B, S0_B, S1_B, will be latched to the configuration registers as initial startup states. 08-0218 4 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Equalizer Configuration The PI2EQX5804 input equalizer compensates for signal attenuation and Inter-Symbol Interference (ISI) resulting from long signal traces or cables, vias, signal crosstalk and other factors, by boosting the gain of highfrequency signal components. Because either too little, or too much, signal compensation may be non-optimal eight levels are provided to adjust for any application. Equalizer configuration is performed in two ways determined by the state of the MODE pin. When the device first powers up, the SELx_[A:B] input pins are read into the appropriate control registers to set the equalization characteristic. If the MODE pin is low, reprogramming of these control registers via I2C is allowed. Each group of four channels, A and B, has separate equalization control, and all four channels within the group are assigned the same configuration state. The Equalizer Selection table below describes pin strapping options and associated operation of the equalizer. Refer to the section on I2C programming for information on software configuration of the equalizer. Equalizer Selection SEL2_[A:B] 0 0 0 0 1 1 1 1 SEL1_[A:B] 0 0 1 1 0 0 1 1 SEL0_[A:B] 0 1 0 1 0 1 0 1 @1.25GHz 0.5dB 0.6dB 1.0dB 1.9dB 2.8dB 3.6dB 5.0dB 7.7dB @2.5GHz 1.2dB 1.5dB 2.6dB 4.3dB 5.8dB 7.1dB 9.0dB 12.3dB Output Configuration The PI2EQX5804 provides flexible output strength and emphasis controls to provide the optimum signal to pre-compensate for losses across long trace or noisy environments so that the receiver gets a clean eye opening. Control of output configuration is grouped for the A and B channels, so that each channel within the group has the same setting. Output configuration is performed in two ways depending on the state of the MODE pin. When the device first powers up, the Sx_[A:B], and Dx_[A:B] input pins are read into the appropriate control registers to set the power-on state. If the MODE pin is low, reprogramming of these control registers via I2C is allowed. The Output Swing Control table shows available configuration settings for output level control, as specified using the Sx_y pins and registers. 08-0218 5 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Output Swing Control S1_[A:B] 0 0 1 1 S0_[A:B] 0 1 0 1 Swing (Diff. VPP) 1V 0.5V 0.7V 0.9V Emphasis settings are determined by the state of the DEx_y input pins and configuration registers, as shown in the Output De-emphasis table below. De-Emphasis is selected as the default power-on mode in following the PCI Express specification, but can be changed to Pre-emphasis via reprogramming the Loopback and Emphasis Control register using the I2C interface. Output De-emphasis Adjustment D2_[A:B] D1_[A:B] 0 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 D0_[A:B] 0 1 0 1 0 1 0 1 De-emphasis 0dB -2.5dB -3.5dB -4.5dB -5.5dB -6.5dB -7.5dB -8.5dB Input Level Detect An input level detect and output squelch function is provided on each channel to eliminate re-transmission of input noise. A continuous signal level below the Vth- threshold causes the output driver to go to a high-impredance state, so that both the positive and negative output signal are pulled to VDD by the internal pull-up resistors. This feature supports the L0s PCI Express Electrical Idle state. Receiver Detect Automatic Receiver Detection is a feature that can set the number of active channels. By sensing the presence of a load device on the output, the channel can be automatically enabled for operation. This allows the PI2EQX5804 to configure itself properly depending on the devices it is communicating with, whether it is a 4-lane, 3-lane, 2-lane or just 1-lane device or adapter card. Receiver Detect is enabled by the RXD_A, or RXD_B pins, or alternatively via I2C programming. When RXD_A or RXD_B is set to low, then the Receiver Detect operation for that group of channel is disabled, and those channels go directly to 50-Ohm input termination to ground and 50-Ohm output termination to VDD (for a valid differential channel input level) or to 2K-Ohm (if the signal level is less than the threshold level). (Continued) 08-0218 6 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis The RESET# input is used to reset the receiver detect state machine to its initial state. The start of the receiver detect cycle starts when RESET# transitions from low to high. When a Receiver Detect cycle is begins the differential channel pins are enabled with a 2K-Ohm pullup to Vdd. A 50Ohm Receiver termination will change the pin level. This pin level is evaluated after a fixed time-out, and the channel is then set into the proper operating state. The output signals RX50_A and RX50_B represent the receiver detect result for their specific channels. The I/O Operation table summaries the relationships and operation of receiver detect and other signals involved with I/O control. Table 4 - I/O Operation Control Control Inputs PD# RXD_x RESET# 0 X X 1 1 1 0 0 0 0 1 1 Detection States RX50 SIG_x X X X X X X 0 1 Data Channel I/O Input Termination Output Termination Hi-Z Hi-Z Hi-Z 50-Ohm pulldown 50-Ohm pulldown Hi-Z Hi-Z 2K-Ohm pull-up 2K-Ohm pull-up 50-Ohm pull-up Mode Full IC power down, all channels disabled Channel disabled, output pulls to Vdd. Receiver detect reset Channel enabled, no input signal, output pulls to Vdd. Receiver detect disabled Channel enabled, valid input signal detected, output driving. Receiver detect disabled. Channel disabled. Receiver detect reset.p Channel disabled, output pulls to Vdd. Receiver detect enabled, no receiver detected. Channel inactive, output pulls to Vdd. Receiver detect enabled, receiver detected. No input signal Channel active, valid input signal detected, output driving. Receiver detect enabled, load detected. 1 1 1 1 0 1 X 0 X X 2K-Ohm pull-up 2K-Ohm pull-up 1 1 1 1 0 50-Ohm pulldown 50-Ohm pulldown 2K-Ohm pull-up 1 1 1 1 1 50-Ohm pull-up 08-0218 7 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Loopback Operation Each lane of the 5804 provides a loopback mode for test purposes which is controlled by a strapping pin and I2C register bit. The LB# pin controls all lanes together. When this pin is high normal data mode is enabled. When LB# is low the loopback mode is enabled. The figure below diagrams this operation. Loopback is not intended to be dynamically switched, and the normal system application is to initialize to one configuration or the other. The Loopback mode can also support mux/demux operation. Using I2C configuration, unused inputs and outputs can be disabled to minimize power and unnecessary noise. A0 B0 A0 A0 B0 A0 B0 B0 Normal Operation LB#=1 Loopback Mode LB#=0 A0 B0 A0 A0 B0 A0 B0 B0 Mux Function ODIS_AO = 1 Solid: LB_A0B0#=1 Dashed: LB_A0B0#=0 Demux Function INDIS_BO = 1 Solid: LB=1 Dashed: LB=0 Loopback Modes 08-0218 8 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis I2C Operation The integrated I2C interface operates as a slave device, supporting standard rate operation of 100Kbps, with 7-bit addressing mode, with support for offset byte-write and read. The data byte format is 8 bit bytes. The bytes must be accessed in sequential order from the lowest to the highest byte with the ability to stop after any complete byte has been transferred. Address bits A4, A1 and A0 are programmable to support multiple chips environment. The data is loaded until a Stop sequence is issued. Note that the I2C inputs, SCL and SDA operate at 1.2V logic levels and are 3.3V tolerant. Configuration Register Summary Byte 0 1 2 3 4 5 6 7 8 9 10 11 Mnemonic SIG RX50 LBEC INDIS OUTDIS RESET PWR RXDE AEOC AEOC RSVD RSVD Function Signal Detect, indicates valid input signal level Receiver Detect Output, indicates whether a receiver load was detected Loopback and Emphasis Control, provides for control of the loopback function and emphasis mode (preemphasis or de-emphasis) Channel Input Disable, controls whether s channels input buffer is enabled or disabled Channel Output Disable: Controls whether a channels output buffer is enabled or disabled Channel Reset Power Down Control, enables power down for each channel individually Receiver Detect Enable, controls the receiver detect operation A-Channels Equalizer and Output Control B-Channels Equalizer and Output Control Reserved Reserved 08-0218 9 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Transferring Data Every byte put on the SDA line must be 8-bits long. Each byte has to be followed by an acknowledge bit. Data is transferred with the most significant bit (MSB) first (see the I2C Data Transfer diagram). The PI2EQX5804 will never hold the clock line SCL LOW to force the master into a wait state. Note: Byte-write and byte-read transfers have a fixed offset of 0x00, because of the very small number of configuration bytes. An offset byte presented by a host to the PI2EQX5804 is not used. Addressing Up to eight PI2EQX5804 devices can be connected to a single I2C bus. The PI2EQX5804 supports 7-bit addressing, with the LSB indicating either a read or write operation. The address for a specific device is determined by the A0, A1 and A4 input pins. Address Assignment A6 1 A5 1 A4 Program A3 0 A2 0 A1 A0 Programmable R/W 1=R, 0=W Acknowledge Data transfer with acknowledge is required from the master. When the master releases the SDA line (HIGH) during the acknowledge clock pulse, the PI2EQX5804 will pull down the SDA line during the acknowledge clock pulse so that it remains stable LOW during the HIGH period of this clock pulse as indicated in the I2C Data Transfer diagram. The PI2EQX5804 will generate an acknowledge after each byte has been received. Data Transfer A data transfer cycle begins with the master issuing a start bit. After recognizing a start bit, the PI2EQX5804 will watch the next byte of information for a match with its address setting. When a match is found it will respond with a read or write of data on the following clocks. Each byte must be followed by an acknowledge bit, except for the last byte of a read cycle which ends with a stop bit. For a write cycle, the first data byte following the address byte is a dummy or fill byte that is not used by the PI2EQX5804. This byte is provided to provided compatibility with systems implementing 10-bit addressing. Data is transferred with the most significant bit (MSB) first. 08-0218 10 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Register Description Byte 0 - Signal Detect (SIG) SIG_xy=0=low input signal, SIG_xy=1=valid input signal Bit Name Type Power-on State 7 SIG_A0 R X 6 SIG_B0 R X 5 SIG_A1 R X 4 SIG_B1 R X 3 SIG_A2 R X 2 SIG_B2 R X 1 SIG_A3 R X 0 SIG_B3 R X Note: R=Read only, W=Write only, R/W=Read and Write, X=Undefined, rsvd=reserved for future use The Signal Detect register provides information on the instantaneous status of the channel input from the Input Level Threshold Detect circuit. If the input level falls below the Vth- level the relevant SIG_xy bit will be 0, indicating a lowlevel noise or electrical idle input, resulting in the outputs going to the high-impedance off state or squelch mode. If the input level is above Vth-, then SIG_xy is 1, indicating a valid input signal, and active signal recovery operation. Byte 1 - Receiver Detect Output Register (RX50) LB_xyxy#=0=loopback mode, LB_xyxy#=1=normal mode, DE_x=0=pre-emphasis, DE_x=1=de-emphasis Bit Name Type Power-on State 7 RX50_A0 R X 6 RX50_B0 R X 5 RX50_A1 R X 4 RX50_B1 R X 3 RX50_A2 R X 2 RX50_B2 R X 1 RX50_A3 R X 0 RX50_B3 R X Note: R=Read only, W=Write only, R/W=Read and Write, X=Undefined, rsvd=reserved for future use The RX50_xy bits report the result of a receiver detection cycle. One bit is assigned for each channel of the device. RX50_xy is at a logic 1 level indicating a load and receiver was detected. When RX50_xy is 0 then a load device was not detected. The RX50 register is read-only, and is undefined after power-up until a Receiver Detection cycle completes. Byte 2 - Loopback and Emphasis Control Register (LBEC) LB_xyxy#=0=loopback mode, LB_xyxy#=1=normal mode, DE_x=0=pre-emphasis, DE_x=1=de-emphasis Bit Name Type Power-on State 7 LB_A0B0# R/W LB# 6 LB_A1B1# R/W LB# 5 LB_A2B2# R/W LB# 4 LB_A3B3# R/W LB# 3 DE_A R/W DE_A 2 DE_B R/W DE_B 1 rsvd R X 0 rsvd R X Note: R=Read only, W=Write only, R/W=Read and Write, X=Undefined, rsvd=reserved for future use Individual control for each lane is provided for the loopback function via this register. 08-0218 11 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis BYTE 3 - Channel Input Disable (INDIS) INDIS_xy=0=enable input, INDIS_xy=1=disable input Bit Name Type Power-on State 7 INDIS_A0 R/W 0 6 INDIS_B0 R/W 0 5 INDIS_A1 R/W 0 4 INDIS_B1 R/W 0 3 INDIS_A2 R/W 0 2 INDIS_B2 R/W 0 1 INDIS_A3 R/W 0 0 INDIS_ B3 R/W 0 Note: R=Read only, W=Write only, R/W=Read and Write, X=Undefined, rsvd=reserved for future use The Channel Input Disable register, provides control over the input buffer of each channel independently. When and INDIS_xy bit is logic 1, then the input buffer is switched off and the input termination is high impedance. This feature can be used for PCB testing, and when only one input is used during Loopback as a demux function. When INDIS_xy is at a logic 0 state then the input buffer is enabled (normal operating mode). BYTE 4 - Channel Output Disable (OUTDIS) ODIS_xy=0=enable output, ODIS_xy=1=disable output Bit Name Type Power-on State 7 ODIS_A0 R/W 0 6 ODIS_B0 R/W 0 5 ODIS_A1 R/W 0 4 ODIS_B1 R/W 0 3 ODIS_A2 R/W 0 2 ODIS_B2 R/W 0 1 ODIS_ A3 R/W 0 0 ODIS_ B3 R/W 0 Note: R=Read only, W=Write only, R/W=Read and Write, X=Undefined, rsvd=reserved for future use The Channel Output Disable register, allows control over the output buffer of each channel independently. When and OUTDIS_xy bit is logic 1, then the output buffer is switched off and the termination is high impedance. This feature can be used for PCB testing, and when only one output is used during Loopback as a mux function. When INDIS_xy is at a logic 0 state then the input buffer is enabled (normal operating mode). BYTE 5 - Channel Reset (RESET) RES_xy# =0=reset, RES_xy# =1=normal operation. Latch from RESET# input at startup Bit Name Type Power-on State 7 RES_A0# R/W RESET# 6 RES_B0# R/W RESET# 5 RES_A1# R/W RESET# 4 RES_B1# R/W RESET# 3 RES_A2# R/W RESET# 2 RES_B2# R/W RESET# 1 RES_A3# R/W RESET# 0 RES_B3# R/W RESET# Note: R=Read only, W=Write only, R/W=Read and Write, X=Undefined, rsvd=reserved for future use The Channel Reset register allows for restart of an individual channels Receiver Detect function. A transition from 0 to 1 initiates a new Receiver Detect cycle (if the channel is enabled and receiver detect is enabled). While static at 0 or 1, the RES_zy# bit will have no effect on operation. The Channel Reset bits are read/write allowing the current state to be checked. 08-0218 12 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis BYTE 6 - Power Down Control (PWR) PD_xy# =0=channel off/power down, PD_xy# =1=normal operation, Latch from PD# input at startup Bit Name Type Power-on State 7 PD_A0# R/W PD# 6 PD_B0# R/W PD# 5 PD_A1# R/W PD# 4 PD_B1# R/W PD# 3 PD_A2# R/W PD# 2 PD_B2# R/W PD# 1 PD_A3# R/W PD# 0 PD_B3# R/W PD# Note: R=Read only, W=Write only, R/W=Read and Write, X=Undefined, rsvd=reserved for future use The Power Down Control register allows for individual control over each channel for power savings. When PD_xy# is logic 0 the channel is turned off. When PD_xy# is 1 then the channel is enabled for normal operation. BYTE 7 - Receiver Detect Enable (RXD) RXD_xy =0=channel off/power down, RXD_xy =1=normal operation, Latch from PD# input at startup Bit Name Type Power-on State 7 RXD_A0 R/W RXD_A 6 RXD_B0 R/W RXD_B 5 RXD_A1 R/W RXD_A 4 RXD_B1 R/W RXD_B 3 RXD_A2 R/W RXD_A 2 RXD_B2 R/W RXD_B 1 RXD_A3 R/W RXD_A 0 RXD_B3 R/W RXD_B Note: R=Read only, W=Write only, R/W=Read and Write, X=Undefined, rsvd=reserved for future use The Receiver Detect Enable register allows for control of the receiver detect state machine for each individual channel. When RXD_xy is set to 0, then the receiver detect function is disabled. When RXD_xy is logic 1, then the receiver detect state machine is enabled for operation. The initial state of the register bits are determined by the RXD_A and RXD_B input pins during power-up. BYTE 8 - A-Channels Equalizer and Output Control (AEOC) SELx_A: Equalizer configuration, Dx_A: Emphasis control, Sx_A: Output level control (see Configuration Table) Bit Name Type Power-on State 7 SEL0_A R/W SEL0_A 6 SEL1_A R/W SEL1_A 5 SEL2_A R/W SEL2_A 4 D0_A R/W D0_A 3 D1_A R/W D1_A 2 D2_A R/W D2_A 1 S0_A R/W S0_A 0 S1_A R/W S1_A Note: R=Read only, W=Write only, R/W=Read and Write, X=Undefined, rsvd=reserved for future use The A-Channels Equalizer and Output Control register is used to control the configuration of the input equalizer and output emphasis and levels of the four A channels. These register bits are loaded from the input configuration pins of the same name at power-on. These bits may be changed if the MODE# input is set to allow I2C configuration. Please refer to the tables (1) Equalizer Configuration, (2) Output Swing Configuration and 08-0218 13 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis (3) Output Emphasis Configuration earlier in this document for setting information. All four A channels get the same configuration settings. BYTE 9 - B-Channels Equalizer and Output Control (BEOC) SELx_B: Equalizer configuration, Dx_B: Emphasis control, Sx_B: Output level control (see Configuration Table) Bit Name Type Power-on State 7 SEL0_B R/W SEL0_B 6 SEL1_B R/W SEL1_B 5 SEL2_B R/W SEL2_B 4 D0_B R/W D0_B 3 D1_B R/W D1_B 2 D2_B R/W D2_B 1 S0_B R/W S0_B 0 S1_B R/W S1_B Note: R=Read only, W=Write only, R/W=Read and Write, X=Undefined, rsvd=reserved for future use The B-Channels Equalizer and Output Control register is used to control the configuration of the input equalizer and output emphasis and levels of the four B channels. These register bits are loaded from the input configuration pins of the same name at power-on. These bits may be changed if the MODE# input is set to allow I2C configuration. Please refer to the tables (1) Equalizer Configuration, (2) Output Swing Configuration and (3) Output Emphasis Configuration earlier in this document for setting information. All four B channels get the same configuration settings. BYTE 10 - Reserved BYTE 11 - Reserved Reserved Bytes 10 and 11 are also visible via the I2C interface. These bytes are R/W, are initialized to 0 at power up, are used for IC manufacturing test purposes and should not be changed for normal operation. Start & Stop Conditions A HIGH to LOW transition on the SDA line while SCL is HIGH indicates a START condition. A LOW to HIGH transition on the SDA line while SCL is HIGH defines a STOP condition, as shown in the figure below. I2C 08-0218 14 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis I2C Data Transfer 1. Read sequence ACK PI2EQX5804 PI2EQX5804 DATA OUT ACK ACK DATA OUT N NO ACK I2C Master start DEV SEL R/W stop 2. Write sequence ACK PI2EQX5804 ACK ACK ACK ACK I2C Master start DEV SEL DUMMY BYTE DATA IN 1 stop 09/04/08 R/W DATA IN N 3. Combined sequence ACK DUMMY BYTE ACK PI2EQX5804 ACK DATA OUT 1 ACK ACK DATA OUT N NO I2C Master start DEV SEL R / W start DEV SEL R / W Notes: 1. only block read and block write from the lowest byte are supported for this application. 2. for some I2C application, an offset address byte will be presented at the second byte in write command, which is called dummy byte here and will be simply ignored in this application for correct interoperation. 08-0218 15 PS8926B www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Maximum Ratings (Above which useful life may be impaired. For user guidelines, not tested.) Storage Temperature...................................... -65C to +150C Supply Voltage to Ground Potential........ -0.5V to +2.5V DC SIG Voltage....................................... -0.5V to VDD +0.5V Current Output ........................................ -25mA to +25mA Power Dissipation Continuous ............... 1W Operating Temperature............................ 0 to +70C AC/DC Electrical Characteristics Power Supply Characteristics (VDD = 1.2 0.05V, TA = 0 TO 70C) Symbol Parameter Conditions IDDactive Power supply current All channels switching - active IDDstandby Power supply current PD# = 0 - standby Power supply current IDD-channel - per channel, Active AC Performance Characteristics (VDD = 1.2 0.05V, TA = 0 TO 70C) Symbol Parameter Conditions Tpd Channel latency from input to output Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and function al operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Min. Typ. Max. Units 800 mA 5 50 10. mA mA Min. Typ. 750 Max. Units ps CML Receiver Input (VDD = 1.2 0.05V, TA = 0 TO 70C) Symbol Parameter Conditions ZRX-DIFFDC Differential Input DC Impedance ZRX-DC DC Input Impedance VRX-DIFFPP VRX-CMACP VthDifferential Input Peak-to-peak Voltage AC Peak Common Mode Input Voltage Signal detect threshold voltage Min. 80 40 0.175 Typ. Max. Units 100 120 Ohms 50 60 Ohms 1.200 V 150 100 150 mV mV 08-0218 16 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Parameter Residual jitter Residual jitter Random jitter Conditions Total Deterministic Note 2 Min. Typ. Max. 0.3 0.2 Units Ulp-p Ulp-p psrms Equalizer Symbol JRS-T JRS-D JRM 1.5 Notes 1. K28.7 pattern is applied differentially at point A as shown in AC test circuit (see figure). 2. Total jitter does not include the signal source jitter. Total jitter (TJ) = (14.1 x RJ + DJ) where RJ is random RMS jitter and DJ is maximum deterministic jitter. Signal source is a K28.5 pattern (00 1111 1010 11 0000 0101) for the deterministic jitter test and K28.7 (0011111000) or equivalent for random jitter test. Residual jitter is that which remains after equalizing media-induced losses of the environment of Figure 1 or its equivalent. The deterministic jitter at point B must be from media-induced loss, and not from clock source modulation. Jitter is measured at 0V at point C of the AC test circuit (see figure). CML Transmitter Output (VDD = 1.2V 0.05V, TA = 0 to 70C) Symbol Parameter Conditions ZOUT Output resistance Single ended ZTX-DIFF-DC VDIFFP VTX-DIFFP-P VTX-C tF, tR CTX(1) DC Differential TX Impedance Output Voltage Swing, Differential Differential Peak-topeak Ouput Voltage Common-Mode Voltage Min. 40 80 Typ. 50 100 Max. 60 120 800 1.6 Units Ohms Ohms mVpp V V |VTX-D+ - VTX-D-| 200 VTX-DIFFP-P = 2 * | VTX- 0.4 D+ - VTX-D- | | VTX-D+ + VTX-D- | / 2 VDD0.3 150 200 Transition Time 20% to 80% (3) AC Coupling Capacitor 75 ps nF Notes: 1. Recommended external blocking capacitor. Digital I/O DC Specifications (VDD = 1.2V 0.05V, TA = 0 to 70C) Symbol Parameter Conditions Min. VIH DC input logic high VDD/2 +0.2 VIL DC input logic low -0.3 VOH VOL Vhys IIH(1) IIL1(2) IIL2(3) DC output logic high DC output logic low Hysteresis of Schmitt trigger input Input high current Input low current Input low current IOH = 4mA IOL = 4mA 0.2 VDD0.4 Typ. Max. Units VDD+0.3 V VDD/2 -0.2 V V 0.4 V V 250 uA uA uA -250 -500 Notes: 1. Includes input signals A1, A2, A4, Dx_[A:B], DE_[A:B], LB#, MODE#, PD#, RESET#, RXD_[A:B], Sx_[A:B], SCL, SDA, SEL_x[A:B] 2. For control inputs without pullups: A1, A2, A4, SCL, SDA 3. Control inputs with pull-ups include: Dx_[A:B], DE_[A:B], LB#, MODE#, PD#, RESET#, RXD_[A:B], Sx_[A:B], SEL_x[A:B] 08-0218 17 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis SDA and SCL I/O for I2C-bus (VDD = 1.2 0.05v, TA = 0 to 70C) Symbol VIH VIL VOL Vhys Parameter DC input logic high DC input logic low DC output logic low Hysteresis of Schmitt trigger input Conditions Min. 1.1 -0.3 IOL = 3mA 0.2 Typ. 3.6 0.7 0.4 Max. V V V V Units Characteristics of the SDA and SCL bus lines for F/S-mode I2C-bus devices(1) Symbol fSCL tHD;STA tLOW tHIGH tSU;STA tHD;DAT tSU;DAT tr tf tSU;STO tBUF Cb Parameter SCL clock frequency Hold time (repeated) START condition. After this period, the first clock pulse is generated LOW period of the SCL clock HIGH period of the SCL clock Set-up time for a repeated START condition Data hold time Data set-up time Rise time of both SDA and SCL signals Fall time of both SDA and SCL signals Set-up time for STOP condition Buss free time between a STOP and STOP condition Capacitive load for each bus line Conditions Min. 0 4.0 4.7 4.0 4.7 5.0 250 - 4.0 4.7 - Typ. Max. 100 - - - - - - 100 300 - - 400 Unit kHz s s s s s ns ns ns s s pF Notes: 1. All values referred to VIHmin and VILmax levels. 2. A device must initially provide a hold time of at least 300 ns for the SDA signal (referred to the VIHmin of the SCL signal) to bridge the undefined region of the falling edge of SCL. 08-0218 18 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis START STOP START SDA tf SCL tHD;STA tHD;DAT t SU;STA t SU;STO tLOW tSU;DAT tf tr tBUF t HD;STA S HIGH Sr P S I2C Timing Channel Latency, 5.0 Gbps 08-0218 19 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Output Level Settings (1V left, and 0.5V right at 5.0 Gbps) 0.0 dB (Dx = 000) -3.5 dB (Dx = 010) -6.5 dB (Dx = 101) -8.5 dB (Dx = 111) Output De-emphasis Characteristics 08-0218 20 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Eye Diagrams 5.0Gbps (input left, output right) Data Waveforms, 2.5Gbps (left) & 5.0Gbps (right) FR4 Signal Source A B D.U.T. C SmA Connector 30IN SmA Connector In Out AC Test Circuit Referenced in the Electrical Characteristic Table 08-0218 21 PS8926B 09/04/08 www..com PI2EQX5804 5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with Equalization & Emphasis Packaging Mechanical: 100-Ball LFBGA (NJ) DATE: 04/28/08 DESCRIPTION: 100-Ball Low Profile Ball Grid Array (LBGA) PACKAGE CODE: NJ100 REVISION: B DOCUMENT CONTROL #: PD-2055 Ordering Information Ordering Number PI2EQX5804CNJE Package Code NJ Package Description Pb-free & Green 100-Contact LFBGA Notes: * Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ * E = Pb-free and Green * X suffix = Tape/Reel Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com 08-0218 22 PS8926B 09/04/08 |
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