450NX Datasheet, PDF (14/248 Pages) Intel Corporation – Intel 450NX PCIset

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