AM79C970 datasheet(44/168 Pages) AMD

Part #	AM79C970

Description	PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus

PDF	168 Pages

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Manufacturer	AMD [Advanced Micro Devices]

Direct Link	http://www.amd.com

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P R E L I M I N A R Y

AMD

1-911

Am79C970

Slave Configuration Transfers

The host can access the PCnet-PCI PCI configuration

space with a configuration read or write command. The

PCnet-PCI controller will assert

DEVSEL if the IDSEL

input is asserted during the address phase and if the ac-

cess is a configuration cycle.

DEVSEL is asserted two

clock cycles after the host has asserted

FRAME. All

configuration cycles are of fixed length. The PCnet-PCI

controller will assert

TRDY on the 3rd clock of the

data phase.

Slave Configuration Read

The Slave Configuration Read command is used by the

host CPU to read the configuration space in the PCnet-

PCI controller. This provides the host CPU with informa-

tion concerning the device and its capabilities. This is a

single cycle, non-burst 8-bit, 16-bit, or 32-bit transfer.

18220C-22

FRAME

CLK

IRDY

TRDY

123456

ADDR

DATA

1010

BE's

PAR

DEVSEL

IDSEL

STOP

Figure 20. Slave Configuration Read

AM79C970 Datasheet(PDF) 44 Page - Advanced Micro Devices