VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-35-
Device 0 Bus 0 Header Registers - Host Bridge
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
Device 0 Offset E - Header Type.......................................RO
7-0
Header Type Code ............reads 00: single function
Device 0 Offset F - Built In Self Test (BIST)....................RO
7
BIST Supported ......reads 0: no supported functions
6-0
Reserved
........................................ always reads 0
Device 0 Offset 13-10 - Graphics Aperture Base ............RW
31-28 Upper Programmable Base Address Bits....... def=0
27-20 Lower Programmable Base Address Bits ...... def=0
These bits behave as if hardwired to 0 if the
corresponding Graphics Aperture Size register bit
(Device 1 Offset 84h) is 0.
27 26 25 24 23 22 21 20
(This Register)
76
5
4
3
2
1
0
(Gr Aper Size)
RW RW RW RW RW RW RW RW
1M
RW RW RW RW RW RW RW 0
2M
RW RW RW RW RW RW 0
0
4M
RW RW RW RW RW 0
0
0
8M
RW RW RW RW 0000
16M
RW RW RW 00000
32M
RW RW 000000
64M
RW 0000000
128M
00000000
256M
19-0 Reserved
................................ always reads 00008
Note:
The locations in the address range defined by this
register are prefetchable.
Device 0 Offset 2D-2C – Subsystem Vendor ID ............. RW
15-0 Subsystem Vendor ID......................... default = 0000
Device 0 Offset 2F-2E – Subsystem ID............................ RW
15-0 Subsystem ID ...................................... default = 0000
Device 0 Offset 37-34 - Capability Pointer ...................... RO
Contains an offset from the start of configuration space.
31-0 AGP Capability List Pointer ........ always reads A0h
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