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GXM データシート(PDF) 163 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 GXM
部品情報  Geode??GXm Processor Integrated x86 Solution with MMX Support
PDF  244 Pages
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

GXM データシート(HTML) 163 Page - National Semiconductor (TI)

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Revision 3.1
163
www.national.com
Integrated Functions (Continued)
4.6.8.2
PCI Write Transaction
A PCI write transaction is similar to a PCI read transac-
tion, 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
transaction.
The address phasebeginsonclock 2whenFRAME#is
asserted. The first and second data phases complete
without 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#
AD
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



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