A–12
System Address Space
21164 Byte/Word PCI Space
Figure 1–6 21174 CSR Space
1.4 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 1–7.
31
2
1
0
34 33 32
38
39
Address
1
0
PCI Configuration Space
Size
3
6
7
0
0
X
0
35
0
0
28 27
CSR
Space
1
1 1
CPU Address
31
30
29
28
0
0
0
0
0
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
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