SNLS714 September   2022 DS320PR822

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 DC Electrical Characteristics
    6. 6.6 High Speed Electrical Characteristics
    7. 6.7 SMBUS/I2C Timing Charateristics
    8. 6.8 Typical Characteristics
    9. 6.9 Typical Jitter Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Linear Equalization
      2. 7.3.2 Flat-Gain
      3. 7.3.3 Receiver Detect State Machine
      4. 7.3.4 Cross Point
    4. 7.4 Device Functional Modes
      1. 7.4.1 Active PCIe Mode
      2. 7.4.2 Active Buffer Mode
      3. 7.4.3 Standby Mode
    5. 7.5 Programming
      1. 7.5.1 Pin Mode
        1. 7.5.1.1 Five-Level Control Inputs
      2. 7.5.2 SMBUS/I2C Register Control Interface
        1. 7.5.2.1 Shared Registers
        2. 7.5.2.2 Channel Registers
      3. 7.5.3 SMBus/I 2 C Primary Mode Configuration (EEPROM Self Load)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 UPI x24 Lane Cross-Point Configuration
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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5 Pin Configuration and Functions

GUID-20210302-CA0I-8ZTB-ZBCV-R57V1RFF86GH-low.gif Figure 5-1 NJX Package,64-Pin WQFN(Top View)
Table 5-1 Pin Functions
PIN TYPE(1) DESCRIPTION
NAME NO.
ALL_DONE_N 31 O, 3.3 V open drain In SMBus/I2C Primary mode:
Indicates the completion of a valid EEPROM register load operation. External pullup resistor such as 4.7 kΩ required for operation.
High: External EEPROM load failed or incomplete
Low: External EEPROM load successful and complete
In SMBus/I2C Secondary/Pin mode:
This output is High-Z. The pin can be left floating.
MODE 61 I, 5-level Sets device control configuration modes. 5-level IO pin as provided in Table 7-4. The pin can be exercised at device power up or in normal operation mode.
L0: Pin mode – device control configuration is done solely by strap pins.
L1: SMBus/I2C Primary mode – device control configuration is read from external EEPROM. When the DS320PR822 has finished reading from the EEPROM successfully, it will drive the ALL_DONE_N pin LOW. SMBus/I2C secondary operation is available in this mode before, during or after EEPROM reading. Note: during EEPROM reading if the external SMBus/I2C primary wants to access DS320PR822 registers it must support arbitration.
L2: SMBus/I2C Secondary mode – device control configuration is done by an external controller with SMBus/I2C primary.
L3 and L4 (Float): RESERVED – TI internal test modes.
EQ0 / ADDR0 59 I, 5-level In Pin mode:
Sets receiver linear equalization (CTLE) boost for channels 0-3 (Bank 0) as provided in Table 7-1. These pins are sampled at device power-up only.
In SMBus/I2C mode:
Sets SMBus / I2C secondary address as provided in Table 7-5. These pins are sampled at device power-up only.
EQ1 / ADDR1 60 I, 5-level
EQ0_1 27 I, 5-level Sets receiver linear equalization (CTLE) boost for channels 4-7 (Bank 1) as provided in Table 7-1 in Pin mode. The pin is sampled at device power-up only.
EQ1_1 29 I, 5-level
GAIN0 / SDA 63 I, 5-level / I/O, 3.3 V LVCMOS, open drain In Pin mode:
Flat gain (DC and AC) from the input to the output of the device for channels 0-3 (Bank 0). The pin is sampled at device power-up only.
In SMBus/I2C mode:
3.3 V SMBus/I2C data. External 1 kΩ to 5 kΩ pullup resistor is required as per SMBus / I2C interface standard.
GAIN1 28 I, 5-level Flat gain (DC and AC) from the input to the output of the device for channels 4-7 (Bank 1) in Pin mode. The pin is sampled at device power-up only.
GND EP, 9, 12, 21, 24, 32, 41, 44, 53, 56, 64 P Ground reference for the device.
EP: the Exposed Pad at the bottom of the QFN package. It is used as the GND return for the device. The EP should be connected to one or more ground planes through the low resistance path. A via array provides a low impedance path to GND. The EP also improves thermal dissipation.
PD0 25 I, 3.3 V LVCMOS 2-level logic controlling the operating state of the redriver. Active in all device control modes. The pin has internal 1-MΩ weak pull-down resistor. The pin triggers PCIe Rx detect state machine when toggled.
High: power down for channels 0-3
Low: power up, normal operation for channels 0-3
PD1 26 I, 3.3 V LVCMOS 2-level logic controlling the operating state of the redriver. Active in all device control modes. The pin has internal 1-MΩ weak pull-down resistor. The pin triggers PCIe Rx detect state machine when toggled.
High: power down for channels 4-7
Low: power up, normal operation for channels 4-7
READ_EN_N 57 I, 3.3 V LVCMOS In SMBus/I2C Primary mode:
After device power up, when the pin is low, it initiates the SMBus / I2C Primary mode EEPROM read function. When EEPROM read is complete (indicated by assertion of ALL_DONE_N low), this pin can be held low for normal device operation. During the EEPROM load process the device’s signal path is disabled.
In SMBus/I2C Secondary and Pin modes:
In these modes the pin is not used. The pin can be left floating. The pin has internal 1-MΩ weak pull-down resistor.
SEL0 58 I, 3.3 V LVCMOS
The pin selects the mux path for channels 0-3.
L: straight data path – RX[0/1/2/3][P/N] connected to TX[0/1/2/3][P/N] through the redriver.
H: cross data path – RX[0/1/2/3][P/N] connected to TX[1/0/3/2][P/N] through the redriver.
Active in all device control modes. 59 kΩ internal pull-down. Note: the pin also triggers PCIe RX detect state machine when toggled.
SEL1 30 I, 3.3 V LVCMOS
The pin selects the mux path for channels 4-7.
L: straight data path – RX[4/5/6/7][P/N] connected to TX[4/5/6/7][P/N] through the redriver.
H: cross data path – RX[4/5/6/7][P/N] connected to TX[5/4/7/6][P/N] through the redriver.
Active in all device control modes. 59 kΩ internal pull-down. Note: the pin also triggers PCIe Rx detect state machine when toggled.
RX_DET / SCL 62 I, 5-level / I/O, 3.3 V LVCMOS, open drain In Pin mode:
Sets receiver detect state machine options as provided in Table 7-3. The pin is sampled at device power-up only.
In SMBus/I2C mode:
3.3V SMBus/I2C clock. External 1 kΩ to 5 kΩ pullup resistor is required as per SMBus / I2C interface standard.
RX0N 2 I Inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 0.
RX0P 1 I Non-inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 0.
RX1N 5 I Inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 1.
RX1P 4 I Non-inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 1.
RX2N 8 I Inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 2.
RX2P 7 I Non-inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 2.
RX3N 11 I Inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 3.
RX3P 10 I Non-inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 3.
RX4N 14 I Inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 4.
RX4P 13 I Non-inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 4.
RX5N 17 I Inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 5.
RX5P 16 I Non-inverting differential inputs to the equalizer. An on-chip, 100 Ω termination resistor connects RXP to RXN. Channel 5.
RX6N 20 I Inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 6.
RX6P 19 I Non-inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 6.
RX7N 23 I Inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 7.
RX7P 22 I Non-inverting differential inputs to the equalizer. Integrated 50 Ω termination resistor from the pin to internal CM bias voltage. Channel 7.
TX0N 54 O Inverting pin for 100 Ω differential driver output. Channel 0.
TX0P 55 O Non-inverting pin for 100 Ω differential driver output. Channel 0.
TX1N 51 O Inverting pin for 100 Ω differential driver output. Channel 1.
TX1P 52 O Non-inverting pin for 100 Ω differential driver output. Channel 1.
TX2N 48 O Inverting pin for 100 Ω differential driver output. Channel 2.
TX2P 49 O Non-inverting pin for 100 Ω differential driver output. Channel 2.
TX3N 45 O Inverting pin for 100 Ω differential driver output. Channel 3.
TX3P 46 O Non-inverting pin for 100 Ω differential driver output. Channel 3.
TX4N 42 O Inverting pin for 100 Ω differential driver output. Channel 4.
TX4P 43 O Non-inverting pin for 100 Ω differential driver output. Channel 4.
TX5N 39 O Inverting pin for 100 Ω differential driver output. Channel 5.
TX5P 40 O Non-inverting pin for 100 Ω differential driver output. Channel 5.
TX6N 36 O Inverting pin for 100 Ω differential driver output. Channel 6.
TX6P 37 O Non-inverting pin for 100 Ω differential driver output. Channel 6.
TX7N 33 O Inverting pin for 100 Ω differential driver output. Channel 7.
TX7P 34 O Non-inverting pin for 100 Ω differential driver output. Channel 7.
VCC 6, 18, 38, 50 P Power supply pins. VCC = 3.3 V ±10%. The VCC pins on this device should be connected through a low-resistance path to the board VCC plane. Install a decoupling capacitor to GND near each VCC pin.
RSVD2, 3, 4, 5 3, 15, 35, 47 — Reserved pins – for best signal integrity performance connect the pins to GND. Alternate option would be 0 Ω resistors from pins to GND.
(1) I = input, O = output, P = power
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