AM79C970A datasheet(48/219 Pages) AMD

部件名	AM79C970A

功能描述	PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product

PDF	219 Pages

Scroll/Zoom	100%

制造商	AMD [Advanced Micro Devices]

网页	http://www.amd.com

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48 / 219 page

AMD

P R E L I M I N A R Y

Am79C970A

Target Initiated Termination

When the PCnet-PCI II controller is a bus master, the

cycles it produces on the PCI bus may be terminated by

the target in one of three different ways.

Disconnect With Data Transfer

The figure below shows a disconnection in which one

last data transfer occurs after the target asserted

STOP.

STOP is asserted on clock 4 to start the termination

sequence.

Data

still

transferred

during

this

cycle, since both

IRDY and TRDY are asserted. The

PCnet-PCI II controller terminates the current transfer

with the deassertion of

FRAME on clock 5 and of IRDY

one clock later. It finally releases the bus on clock 6. The

PCnet-PCI II controller will re-request the bus after 2

clock cycles, if it wants to transfer more data. The start-

ing address of the new transfer will be the address of the

next untransferred data.

19436A-20

FRAME

CLK

IRDY

TRDY

DEVSEL

REQ

GNT

PAR

DEVSEL is sampled

ADDRi

0000

0111

PAR

0111

2345678

PAR

DATA

STOP

ADDRi+8

DATA

Figure 17. Disconnect With Data Transfer

AM79C970A 数据表(PDF) 48 Page - Advanced Micro Devices

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