Byte/Word Pci Space - Samsung AlphaPC 164UX Technical Reference Manual

Figure 1–7 Byte/Word PCI Space
PCI Memory Space — 4GB
39 38 37 36 35 34 33 32
1 Size X 1 0 0 0
PCI I/O Space — 4GB
39 38 37 36 35 34 33 32
1 Size X 1 0 0 1
PCI Type 0 Configuration Space — 4GB
39 38 37 36 35 34 33 32
1 Size X 1 0 1 0
PCI Type 1 Configuration Space — 4GB
39 38 37 36 35 34 33 32
1 Size X 1 0 1 1
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
PCI Memory Address <31:2>
31
PCI I/O Address
31
PCI Configuration Address <31:2>
31
PCI Configuration Address <31:2>

21164 Byte/Word PCI Space

2 1 0
2 1 0
2 1 0
LJ-05399.AI4
System Address Space
0 0
0
0 0
0 1
A–13