4. Register Descriptions
175
Tsi308 User Manual
80D4000_MA001_02
Tundra Semiconductor Corporation
www.tundra.com
4.3.5.92
DMA Map Register
These registers are valid only in GSP/GDP modes.
Register Offset : E3h-E2h
4.3.5.93
Index Register
These registers are valid only in GSP/GDP modes.
Register Offset : E7h-E4h
Bit
R/W
Access
Initial
Value
Field Name and Description
15:11
R
14h
Type:
HyperTransport 64-bit address remapping. Always reads 10100b, indicating this is
a HyperTransport 64-bit address remapping.
10:9
R
1h
MapType:
This field is 1h to indicate that Tsi308 implements 64-bit address remapping
8:4
R/W
00h
IOSize:
This field defines the number of bits of downstream IO addresses are discarded.
The default is 0 to pass all 25 bits of a HyperTransport technology IO cycle. All
discarded bits are 0s on the secondary bus
3:0
R
1h
# of DMA mapping support.
Bit
R/W
Access
Initial
Value
Field Name and Description
31:6
Reserved
5:0
R/W
00xxxxh
Idx:
This field is an index to the 64-bit address remap indexed registers.
Содержание TSI308
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Страница 260: ...Index 260 Tsi308 User Manual 80D4000_MA001_02 Tundra Semiconductor Corporation www tundra com ...