82452NX Просмотр технического описания (PDF) - Intel

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82452NX

Intel® 450NX PCIset

Intel 

2. Signal Descriptions

Some signals or groups of signals have multiple versions. These signal groups may represent

distinct but similar ports or interfaces, or may represent identical copies of the signal used to

reduce loading effects. The following conventions are used:

RR(A,B,C)XX

RR(A,...,D)XX

RRpXX, where p=A,B,C

expands to: RRAXX, RRBXX, and RRCXX

expands to: RRAXX, RRBXX, RRCXX, and RRDXX

expands to: RRAXX, RRBXX, and RRCXX

Typically, upper case groups (e.g., “(A,B,C)”) represent functionally similar but logically

distinct signals; each signal provides an independent control, and may or may not be asserted

at the same time as the other signals in the grouping. In contrast, lower case groups (e.g.,

“(a,b,c)”) typically represent identical duplicates of a common signal provided to reduce

loading.

2.2

Summary

Figure 2-1 illustrates the partitioning of interfaces across the components in the Intel® 450NX

PCIset. The remainder of this section lists the signals and signal counts in each interface by

component. The signal functions are described in subsequent sections.

Pentium® II Xeon™ processor bus

System Interface

MIOC

Memory

Interface

(External)

Expander

Interface (2)

1

PXB #1

0

PXB #0

MUXs

DRAM

Array

Memory Interface (Internal)

memory

cards

1B 1A

0B 0A

PCI Interfaces (2)

PCI Interfaces (2) PCI Bus #0A is the Compatibility Bus

Figure 2-1: Interface Summary: Partitioning

2.2.1

Signal Summary, By Component

The following tables provide summary lists of all signals in each component, sorted

alphabetically within interface type. The signals are described in a later section.

2-2

Intel® 450NX PCIset

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