DM9102AT datasheet(61/77 Pages) ETC

61 / 77 page

DM9102A

Single Chip Fast Ethernet NIC controller

Final

Version: DM9102A-DS-F03

August 28, 2000

Serial ROM Overview

The purpose of Configuration ROM (EEPROM) is to support

the DM9102A information to the driver for the card. The

SROM must support 64 words or more space for

configuration data. The format of the SROM is as followed

The format of EEPROM

Field Name

Offset

Size

Subsystem ID block

CROM version

Controller count

Controller_0 Information

Controller_1 Information

20+n

: (depends on controller count)

CRC checksum

126

1. Subsystem ID Block

Every card must have a Subsystem ID to indicate the

system vendor information. The content will be transferred

into the PCI configuration space during hardware reset

function.

Vendor ID & Device ID can be set in EEPROM content &

auto-loaded to PCI configuration register after reset.(default

value = 1282, 9102) This function must be selectable for

enable/disable by Auto_Load_Control (offset 08 of

EEPROM) setting to avoid damaging default value due to

incorrectly auto-load operation. CRC check circuit of

EEPROM contents to decide the auto-load operation of

Vendor ID & Subsystem.

Subsystem Vendor ID

Subsystem ID

Reserved

ID_block_CRC

PMC

PMCSR

Reserved

PCI Device ID

PCI Vender ID

NCE

Auto_load_control

17,16

Byte Offset.

Subsystem ID Block

Byte Offset (08): Auto_Load_Control

Bit3~0: “1010” to enable auto-load of PCI Vendor_ID &

Device_ID, “0” to disable.

Bit7~4: “1X1X” to enable auto-load of NCE, PME & PMC &

PMCSR to PCI configuration space. These four bits can

also control the inverse of WOL or PULSE WOL..

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