HARDWARE REFERENCE A
3-20
Table 3-21. Memory Region 0 Settings
Bits Function Setting
1:0 Bus Width 11 (32 Bit Bus Width)
5:2 Internal Wait States 0 (No Wait States)
6 READY Input Enable 1 (Enabled)
7 BTERM Input Enable 0 (Disabled)
Table 3-22. Local Address Space 0 Range Register
Field Description Read Write
Value after Reset
(Cold PC Reset)
0
Memory space indicator:
0 indicates Local address space 0 maps into PCI memory space.
1 indicates address space 0 maps into PCI I/O space.
Yes Yes 0
2:1
If mapped into memory space, encoding is as follows:
2 1 Meaning
0 0 locate anywhere in 32 bit PCI address space
0 1 locate below 1 Mbyte in PCI address space
1 0 locate anywhere in 64 bit PCI address space
1 1 reserved
If mapped into I/O space, bit 1 must be a 0. Bit 2 is included with bits 3 through
31 to indicate decoding range.
Yes Yes 0
3
If mapped into memory space, 1 indicates that reads are prefetchable. If
mapped into I/O space, bit is included with bits 2 through 31 to indicate
decoding range. 0 indicates reads are not prefetchable. This must be 0 on the
PCI-SDK Platform.
Yes Yes 0
31:4
Specifies which PCI address bits are used to decode a PCI access to local bus
space 0. Each bit corresponds to an address bit. Bit 31 corresponds to Address
bit 31. Set (=1) all bits to be included in decode; clear (=0) all other bits.
(Used in conjunction with PCI Configuration register 18H). Default is 1 Meg.
Yes Yes FFF0 000H
Table 3-23. Local Address Space 0 Local Base Address (Re-map) Register Description
Field Description Read Write
Value after Reset
(Cold PC Reset)
0
Space 0 Enable: 0 disables Decode of PCI addresses for Direct Slave
access to local space 0; 1 enables Decode.
Yes Yes 0
1 Not Used Yes Yes 0
3:2
If local space 0 is mapped into memory space, bits are not used. If mapped
into I/O space, bit is included with bits 4 through 31 for re-mapping.
Yes Yes 0
31:4
Re-map of PCI Address to Local Address Space 0 into a Local Address
Space. The bits in this register will re-map (replace) the PCI Address bits
used in decode as the Local Address bits.
Yes Yes 0
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