SNLS334G April   2011  – January 2015 DS80PCI800

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 Ratings
    4. 6.4 Electrical Characteristics
    5. 6.5 Electrical Characteristics — Serial Management Bus Interface
    6. 6.6 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 4-Level Input Configuration Guidelines
    4. 8.4 Device Functional Modes
      1. 8.4.1 Pin Control Mode
      2. 8.4.2 SMBUS Mode
    5. 8.5 Programming
      1. 8.5.1 System Management Bus (SMBus) and Configuration Registers
      2. 8.5.2 Transfer of Data Through the SMBus
      3. 8.5.3 Writing a Register
      4. 8.5.4 Reading a Register
      5. 8.5.5 SMBus Master Mode
    6. 8.6 Register Maps
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 DS80PCI800 versus DS80PCI810
      2. 9.1.2 Signal Integrity in PCIe Applications
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 3.3-V or 2.5-V Supply Mode Operation
    2. 10.2 Power Supply Bypassing
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 PCB Layout Considerations for Differential Pairs
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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5 Pin Configuration and Functions

DS80PCI800
54 Lead
Top View
30133392.gif

Pin Functions(1)(2)(3)(4)

PIN I/O, TYPE DESCRIPTION
NAME NO.
DIFFERENTIAL HIGH SPEED I/Os
INB_0+, INB_0-, INB_1+, INB_1-, INB_2+, INB_2-, INB_3+, INB_3- 1, 2, 3, 4, 5, 6, 7, 8 I, CML Inverting and non-inverting differential inputs to bank B equalizer. A gated on-chip 50-Ω termination resistor connects INB_n+ to VDD and INB_n- to VDD depending on the state of RXDET. See Table 4
AC coupling required on high-speed I/O
INA_0+, INA_0-, INA_1+, INA_1-, INA_2+, INA_2-, INA_3+, INA_3- 10, 11, 12, 13, 15, 16, 17, 18 I, CML Inverting and non-inverting differential inputs to bank A equalizer. A gated on-chip 50-Ω termination resistor connects INA_n+ to VDD and INA_n- to VDD depending on the state of RXDET. See Table 4
AC coupling required on high-speed I/O
OUTB_0+, OUTB_0-, OUTB_1+, OUTB_1-, OUTB_2+, OUTB_2-, OUTB_3+, OUTB_3- 45, 44, 43, 42, 40, 39, 38, 37 O, CML Inverting and non-inverting 50-Ω driver bank B outputs with de-emphasis. Compatible with AC-coupled CML inputs.
OUTA_0+, OUTA_0-, OUTA_1+, OUTA_1-, OUTA_2+, OUTA_2-, OUTA_3+, OUTA_3- 35, 34, 33, 32, 31, 30, 29, 28 O, CML Inverting and non-inverting 50-Ω driver bank A outputs with de-emphasis. Compatible with AC-coupled CML inputs.
CONTROL PINS — SHARED (LVCMOS)
ENSMB 48 I, 4-LEVEL, LVCMOS System management bus (SMBus) enable pin
Tie 1 k to VDD (2.5-V mode) or VIN (3.3 V-mode) = Register access SMBus slave mode
FLOAT = Read external EEPROM (master SMBUS mode)
Tie 1 kΩ to GND = Pin mode
ENSMB = 1 (SMBus SLAVE MODE)
SCL 50 I, 2-LEVEL, LVCMOS, O, open drain In SMBus Slave Mode, this pin is the SMBus clock I/O. Clock input or open drain output.
External 2-kΩ to 5-kΩ pullup resistor to VDD or VIN recommended as per SMBus interface standards.(5)
SDA 49 I, 2-LEVEL, LVCMOS, O, open drain In both SMBus Modes, this pin is the SMBus data I/O. Data input or open drain output.
External 2-kΩ to 5-kΩ pullup resistor to VDD or VIN recommended as per SMBus interface standards.(5)
AD0-AD3 54, 53, 47, 46 I, 4-LEVEL, LVCMOS SMBus Slave Address Inputs. In both SMBus Modes, these pins are the user set SMBus slave address inputs.
External 1-kΩ pullup or pulldown recommended.
READ_EN / SD_TH 26 I, FLOAT In SMBus Slave Mode, this pin is not used. Leave it floating.
ENSMB = FLOAT (SMBus MASTER MODE)
SCL 50 I, 2-LEVEL, LVCMOS, O, open drain Clock output when loading EEPROM configuration, reverting to SMBus clock input when EEPROM load is complete (ALL_DONE = 0).
External 2-kΩ to 5-kΩ pullup resistor to VDD or VIN recommended as per SMBus interface standards.(5)
SDA 49 I, 2-LEVEL, LVCMOS, O, open drain In both SMBus Modes, this pin is the SMBus data I/O. Data input or open drain output.
External 2-kΩ to 5-kΩ pullup resistor to VDD or VIN recommended as per SMBus interface standards.(5)
AD0-AD3 54, 53, 47, 46 I, 4-LEVEL, LVCMOS SMBus Slave Address Inputs. In both SMBus Modes, these pins are the user set SMBus slave address inputs.
External 1-kΩ pullup or pulldown recommended.
READ_EN 26 I, 2-LEVEL, LVCMOS A logic low on this pin starts the load from the external EEPROM(6)
Once EEPROM load is complete (ALL_DONE = 0), this pin functionality remains as READ_EN. It does not revert to an SD_TH input.
ALL_DONE 27 O, 2-LEVEL, LVCMOS Valid register load status output
HIGH = External EEPROM load failed or incomplete
LOW = External EEPROM load passed
ENSMB = 0 (PIN MODE)
EQA0, EQA1,
EQB0, EQB1		 20, 19, 46, 47 I, 4-LEVEL, LVCMOS EQA[1:0] and EQB[1:0] control the level of equalization on the input pins. The pins are active only when ENSMB is deasserted (low). The 8 channels are organized into two banks. Bank A is controlled with the EQA[1:0] pins and bank B is controlled with the EQB[1:0] pins. When ENSMB goes high the SMBus registers provide independent control of each channel. The EQB[1:0] pins are converted to SMBUS AD2/AD3 inputs. See Table 2.
DEMA0, DEMA1,
DEMB0, DEMB1		 49, 50, 53, 54 I, 4-LEVEL, LVCMOS DEMA[1:0] and DEMB[1:0] control the level of de-emphasis of the output driver. The pins are only active when ENSMB is deasserted (low). The 8 channels are organized into two banks. Bank A is controlled with the DEMA[1:0] pins and bank B is controlled with the DEMB[1:0] pins. When ENSMB goes high the SMBus registers provide independent control of each channel. The DEMA[1:0] pins are converted to SMBUS SCL/SDA and DEMB[1:0] pins are converted to AD0, AD1 inputs.
See Table 3.
CONTROL PINS — BOTH PIN AND SMBUS MODES (LVCMOS)
RATE 21 I, 4-LEVEL, LVCMOS RATE control pin selects GEN 1,2 and GEN 3 operating modes.
Tie 1 kΩ to GND = GEN 1,2
FLOAT = AUTO Rate Select of Gen1/2 and Gen3 with de-emphasis
Tie 20 kΩ to GND = GEN 3 without de-emphasis
Tied 1 kΩ to VDD = RESERVED
RXDET 22 I, 4-LEVEL, LVCMOS The RXDET pin controls the receiver detect function. Depending on the input level, a 50 Ω or > 50 kΩ termination to the power rail is enabled.
See Table 4.
RESERVED 23 I, FLOAT Float (leave pin open) = Normal Operation
VDD_SEL 25 I, LVCMOS Controls the internal regulator
FLOAT = 2.5-V mode
Tie GND = 3.3-V mode
See Figure 14
SD_TH 26 I, 4-LEVEL, LVCMOS Controls the internal Signal Detect Threshold.
See Table 5.
PRSNT 52 I, 2-LEVEL, LVCMOS Cable Present Detect input. High when a cable is not present per PCIe Cabling Spec. 1.0. Puts part into low power mode. When LOW (normal operation) part is enabled.
See Table 4.
POWER
VIN 24 Power In 3.3-V mode, feed 3.3 V to VIN
In 2.5-V mode, leave floating
VDD 9, 14, 36, 41, 51 Power Power supply pins
2.5-V mode, connect to 2.5-V supply
3.3-V mode, connect 0.1-µF capacitor to each VDD pin (output of LDO)
GND DAP Power Ground pad (DAP - die attach pad)
(1) LVCMOS inputs without the “FLOAT” conditions must be driven to a logic low or high at all times or operation is not verified.
(2) Input edge rate for LVCMOS/FLOAT inputs must be faster than 50 ns from 10% to 90%.
(3) For 3.3-V mode operation, VIN pin = 3.3 V and the VDD for the 4-level input is 3.3 V.
(4) For 2.5-V mode operation, VDD pin = 2.5 V and the VDD for the 4-level input is 2.5 V.
(5) SCL and SDA pins can be tied either to 3.3 V or 2.5 V, regardless of whether the device is operating in 2.5-V mode or 3.3-V mode.
(6) When READ_EN is asserted low, the device attempts to load EEPROM. If EEPROM cannot be loaded successfully, for example due to an invalid or blank hex file, the DS80PCI800 waits indefinitely in an unknown state where SMBus access is not possible. ALL_DONE pin remains high in this situation.