Specifications

A–12 System Address Space 9 March 1999 – Subject To Change
21164 Byte/Word PCI Space
Figure A–6 21174 CSR Space
A.4 21164 Byte/Word PCI Space
The 21164 supports byte/word instructions that allow software to perform byte gran-
ularity transactions to and from I/O space without using sparse address space. This
space is divided into four regions: memory, I/O, configuration – type 0, and configu-
ration – type 1, as shown in Figure A–7.
31 21034 33 323839
Address
1
0
PCI Configuration Space
Size
367
00
X
0
35
00
28 27
CSR
Space
111
CPU Address
31 30 29 28
000
001
0100
0101
0110
0111
1
Size (GB)
0.5
0.5
0.25
0.25
0.25
0.25
2.00
PCI Configuration Space
PCI IACK/Special Cycle
21174 Main CSRs
Main Memory Control CSRs
21174 Address Translation
Reserved
Miscellaneous
Contents
FM-06062.AI4