AM79C961AVC datasheet(53/206 Pages) AMD

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Am79C961A

Plug and Play Standard Registers

Name

Address

Port Value

Definition

Set RD_DATA Port

0x00

Writing to this location modifies the address of the port used for reading from the

Plug and Play ISA cards. Bits[7:0] become I/O read port address bits [9:2].

Reads from this register are ignored. I/O Address bits 11:10 should = 00, and 1:0 = 11.

Serial Isolation

0x01

A read to this register causes a Plug and Play card in the Isolation state to

compare one bit of the board’s ID. This process is fully described above. This

Config Control

0x02

Bit[0] - Reset all logical devices and restore configuration registers to their

power-up values.

Bit[1] - Return to the Wait for Key state

Bit[2] - Reset CSN to 0

A write to bit[0] of this register performs a reset function on all logical devices.

This resets the contents of configuration registers to their default state. All card’s

logical devices enter their default state and the CSN is preserved.

A write to bit[1] of this register causes all cards to enter the Wait for Key state but

all CSNs are preserved and logical devices are not affected.

A write to bit[2] of this register causes all cards to reset their CSN to zero.

This register is write-only. The values are not sticky, that is, hardware will

automatically clear them and there is no need for software to clear the bits.

Wake[CSN]

0x03

A write to this port will cause all cards that have a CSN that matches the write

data[7:0] to go from the Sleep state to either the Isolation state if the write data

for this command is zero or the Config state if the write data is not zero. This

beginning of the Plug and Play Data Structure.

Resource Data

0x04

A read from this address reads the next byte of resource information. The Status

Status

0x05

Bit[0] when set indicates it is okay to read the next data byte from the Resource

Data register. This register is read-only.

Card Select Number

0x06

A write to this port sets a card’s CSN. The CSN is a value uniquely assigned to

each ISA card after the serial identification process so that each card may be

individually selected during a Wake [CSN] command. This register is read/write.

Logical Device Number

0x07

Selects the current logical device. This register is read only. The PCnet-ISA II

controller has only 1 logical device, and this register contains a value of 0x00

AM79C961AVC Datasheet(PDF) 53 Page - Advanced Micro Devices

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