Specifications

A–8 System Address Mapping
Subject to Change – 17 January 1997
21164 Address Space
A.3 21164 Address Space
This section lists and describes the 21164 address space regions. The requirements
for using the address regions are also shown and described. Table A–1 lists the
21164 address regions.
1
Pseudosparse space is a hardware-specific restricted version of sparse space.
Table A–1 21164 Physical Address Space
21164 Address Size (GB) Selection
00.0000.0000–01.FFFF.FFFF
8Main memory
80.0000.0000–83.FFFF.FFFF
16 PCI memory
—
512MB sparse space
—
Region 0
84.0000.0000–84.FFFF.FFFF
4 PCI memory
—
128MB sparse space
—
Region 1
85.0000.0000–85.7FFF.FFFF
2 PCI memory
—
64MB sparse space
—
Region 2
85.8000.0000–85.BFFF.FFFF
1PCI I/O space
—
32MB sparse space
—
Region A
85.C000.0000–85.FFFF.FFFF
1PCI I/O space
—
32MB sparse space
—
Region B
86.0000.0000–86.FFFF.FFFF
4 PCI memory, 4GB
—
Dense space
87.0000.0000–87.1FFF.FFFF
0.5 PCI configuration sparse space
87.2000.0000–87.3FFF.FFFF
0.5 PCI special/interrupt acknowledge sparse space
87.4000.0000–87.4FFF.FFFF
0.25 CIA main CSRs pseudosparse
1
87.5000.0000–87.5FFF.FFFF
0.25 CIA PCI memory control CSRs pseudosparse
1
87.6000.0000–87.6FFF.FFFF
0.25 CIA PCI address translation pseudosparse
1
87.7000.0000–87.7FFF.FFFF
0.25 Reserved
88.0000.0000–88.FFFF.FFFF
4 21164 byte/word PCI memory space
89.0000.0000–89.FFFF.FFFF
4 21164 byte/word PCI I/O space
8A.0000.0000--8A.FFFF.FFFF
4 21164 byte/word PCI configuration space–type 0
8B.0000.0000--8B.FFFF.FFFF
4 21164 byte/word PCI configuration space–type 1