SNLS344G July   2011  – August 2015 DS80PCI102

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 Electrical Characteristics
    5. 6.5 Electrical Characteristics — Serial Management Bus Interface
    6. 6.6 Timing Diagrams
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 4-Level Input Configuration Guidelines
    4. 7.4 Device Functional Modes
      1. 7.4.1 Pin Control Mode
      2. 7.4.2 SMBUS Mode
    5. 7.5 Programming
      1. 7.5.1 System Management Bus (SMBus) and Configuration Registers
      2. 7.5.2 Transfer of Data Through the SMBus
      3. 7.5.3 SMBus Transactions
      4. 7.5.4 Writing a Register
      5. 7.5.5 Reading a Register
      6. 7.5.6 EEPROM Programming
        1. 7.5.6.1 Master EEPROM Programming
        2. 7.5.6.2 EEPROM Address Mapping
    6. 7.6 Register Maps
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 3.3-V or 2.5-V Supply Mode Operation
    2. 9.2 Power Supply Bypass
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Pin Configuration and Functions

RTW Package
24 Pins
Top View
DS80PCI102 30156925.gif

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

PIN I/O, TYPE DESCRIPTION
NAME NO.
DIFFERENTIAL HIGH SPEED I/O'S
INA+, INA-,
INB+, INB-		 24, 23
11, 12 		I, CML Inverting and noninverting differential inputs to the equalizer. A gated on-chip 50-Ω termination resistor connects INn+ to VDD and INn- to VDD depending on the state of RXDET. See Table 4
AC coupling required on high-speed I/O
OUTA+, OUTA-,
OUTB+, OUTB-		 7, 8
20, 19		 O, CML Inverting and noninverting 50-Ω driver outputs with de-emphasis. Compatible with AC-coupled CML inputs.
CONTROL PINS — SHARED (LVCMOS)
ENSMB 3 I, 4-LEVEL, LVCMOS System management bus (SMBus) enable pin
Tie 1 kΩ 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 5 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 4 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 10, 9, 2, 1 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.
READEN 17 I, 2-LEVEL, LVCMOS When in SMBus Slave Mode the READEN pin must be tied LOW for the AD[3:0] to be active. If this pin is tied HIGH or FLOAT, the device slave address is 0xB0.
ENSMB = FLOAT (SMBus MASTER MODE)
SCL 5 I, 2-LEVEL, LVCMOS, O, open drain Clock output when loading EEPROM configuration, reverting to SMBus clock input when EEPROM load is complete (DONE = 0).
External 2-kΩ to 5-kΩ pullup resistor to VDD or VIN recommended as per SMBus interface standards.(5)
SDA 4 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 10, 9, 2, 1 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.
READEN 17 I, 2-LEVEL, LVCMOS A logic low on this pin starts the load from the external EEPROM.(6)
Once EEPROM load is complete (DONE = 0), this pin functionality remains as READEN. It does not revert to an SD_TH input.
DONE 18 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		 10, 9
1, 2		 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).
When ENSMB goes high the SMBus registers provide independent control of each lane, and the EQA[1:0] and EQB[1:0] pins are converted to SMBUS AD[3:0] inputs.
See Table 2.
DEMA, DEMB 4, 5 I, 4-LEVEL, LVCMOS DEMA DEMB controls the level of de-emphasis. The DEMA/B pins are only active when ENSMB is deasserted (LOW). DEMA controls the A channel and DEMB controls the B channel. When ENSMB goes high the SMBus registers provide independent control of each channel and the DEM pins are converted to SMBUS SDA and SCL pins.
See Table 3.
CONTROL PINS — BOTH PIN AND SMBUS MODES (LVCMOS)
PRSNT 6 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.
VOD_SEL 17 I, 4-LEVEL, LVCMOS VOD Select pin. See Table 3.
VDD_SEL 16 I, LVCMOS Controls the internal regulator.
FLOAT = 2.5-V mode
Tie GND = 3.3-V mode
See Figure 16.
RXDET 18 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.
RATE 13 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
SD_TH 14 I, 4-LEVEL, LVCMOS Controls the internal Signal Detect Threshold.
See Table 5.
POWER
VIN 15 Power In 3.3-V mode, feed 3.3 V to VIN
In 2.5-V mode, leave floating
VDD 21, 22 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 READEN 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 DS80PCI102 waits indefinitely in an unknown state where SMBus access is not possible. DONE pin remains high in this situation.