GX1 datasheet(175/247 Pages) NSC

Part #	GX1

Description	Processor Series Low Power Integrated x86 Solution

PDF	247 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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Integrated Functions (Continued)

4.7.8.2

PCI Write Transaction

A PCI write transaction is similar to a PCI read transaction,

consisting of an address phase and one or more data

phases. Since the master provides both address and data,

no turnaround cycle is required following the address

phase. The data phases work the same for both read and

write transactions. Figure 4-19 illustrates a write transac-

tion.

Theaddress phasebeginson clock 2whenFRAME#is

asserted. The first and second data phases complete with-

out delays. During data phase 3, the target inserts three

wait cycles by deasserting TRDY#.

For additional information refer to Chapter 3.3.2, Write

Transaction, of the PCI Local Bus Specification, Revision

2.1.

Figure 4-19. Basic Write Operation

CLK

FRAME#

C/BE#

DATA-2

DATA-3

ADDR

IRDY#

TRDY#

DEVSEL#

BUS TRANSACTION

ADDR

PHASE

DATA

PHASE

DATA

PHASE

DATA

PHASE

DATA-1

BE#s-2

BE#s-3

BUS CMD

BE#s-1

GX1 Datasheet(PDF) 175 Page - National Semiconductor (TI)

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