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CS5530A Datasheet(PDF) 88 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza CS5530A
Descripción Electrónicos  Geode CS5530A I/O Companion Multi-Function South Bridge
PDF  259 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

CS5530A Datasheet(HTML) 88 Page - National Semiconductor (TI)

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Revision 1.1
Functional Description (Continued)
3.5.2
ISA Bus Interface
The ISA bus controller issues multiple ISA cycles to satisfy
PCI transactions that are larger than 16 bits. A full 32-bit
read or write results in two 16-bit ISA transactions or four 8-
bit ISA transactions. The ISA controller gathers the data
from multiple ISA read cycles and returns TRDY# only after
all of the data can be presented to the PCI bus at the same
time.
SA[23:0] are a concatenation of ISA LA[23:17] and
SA[19:0] and perform equivalent functionality at a reduced
pin count.
Figure 3-8 shows the relationship between a PCI cycle and
the corresponding ISA cycle generated.
Figure 3-8. Non-Posted PCI-to-ISA Access
PCI_CLK
ISACLK
FRAME#
IRDY#
TRDY#
AD[31:0] (Read)
IOR#/IOW#
AD[31:0] (Write)
BALE
STOP#
MEMR#/MEMW#



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