Specifications

9 March 1999 – Subject To Change System Address Space A–13
21164 Byte/Word PCI Space
Figure A–7 Byte/Word PCI Space
Operations are the same for the four regions. The 21164 will issue a single byte/word
read or write transaction for PCI byte and word instructions. The 21164 will not
pack longword load instructions. The 21164 can pack up to eight longword store
instructions for a single 32-byte block into one transaction. Up to four quadword
instructions can also be packed to the same 32-byte block. Byte/word support is
enabled when 21164 IPR register ICSR<17> equals 1 and when 21174 CSR register
PYXIS_CTRL1<0> also equals 1.
31 210
LJ-05399.AI4
3637 35 34 33 323839
PCI Memory Address <31:2>
0
1X
00
1
Size 00
PCI Memory Space — 4GB
31 03637 35 34 33 323839
PCI I/O Address
1
1X
00
1
Size
PCI I/O Space — 4GB
31 2103637 35 34 33 323839
PCI Configuration Address <31:2>
0
1X
10
1
Size 00
PCI Type 0 Configuration Space — 4GB
31 2103637 35 34 33 323839
PCI Configuration Address <31:2>
1
1X
10
1
Size 01
PCI Type 1 Configuration Space — 4GB