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CS5530 Datasheet(PDF) 85 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # CS5530
Description  Geode??CS5530 I/O Companion Multi-Function South Bridge
PDF  241 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

CS5530 Datasheet(HTML) 85 Page - National Semiconductor (TI)

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Revision 4.1
85
www.national.com
Functional Description (Continued)
3.5.2
ISA Bus Interface
The ISA bus controller issues multiple ISA cycles to sat-
isfy 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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