AM79C975VCW datasheet(147/304 Pages) AMD

Part #	AM79C975VCW

Description	PCnet??FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY

PDF	304 Pages

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Manufacturer	AMD [Advanced Micro Devices]

Direct Link	http://www.amd.com

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Am79C973/Am79C975

147

P R E L I M INARY

CSR60: Previous Transmit Descriptor Address

Lower

Bit

Name

Description

31-16 RES

Reserved locations. Written as

zeros and read as undefined.

15-0

PXDAL

Contains the lower 16 bits of the

previous transmit descriptor ad-

dress pointer. The Am79C973/

Am79C975 controller has the ca-

pability to stack multiple transmit

frames.

Read/Write accessible only when

either the STOP or the SPND bit

is set. These bits are unaffected

H_RESET,

S_RESET,

STOP.

Table 25. Software Styles

SWSTYLE

[7:0]

Style

Name

SSIZE32

Initialization Block

Entries

Descriptor Ring Entries

00h

LANCE/

PCnet-ISA

controller

16-bit software structures,

non-burst or burst access

16-bit software structures,

non-burst access only

01h

RES

02h

PCnet-PCI

controller

32-bit software structures,

non-burst or burst access

32-bit software structures,

non-burst access only

03h

PCnet-PCI

controller

32-bit software structures,

non-burst or burst access

32-bit software structures,

non-burst or burst access

All Other

Reserved

Undefined

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