Technical information

7-11
Register Descriptions
PCI Hdrtype (Header Type) Register
Type: R
Internal Registers Subgroup: PCI Configuration Header
Byte Address: 0Eh
BIST (Built-in Self Test) Register
Type: R
Internal Registers Subgroup: PCI Configuration Header
Byte Address: 0Fh
PCI LowBASEADR0 (Base Address 0) Register
Type: R/W
Internal Registers Subgroup: PCI Configuration Header
Byte Address: 10h - 13h
Note
: When an access is made to an address that is mapped and enabled in both the
BASEADR0
and
EXROMCTL
registers, The PCI responds with a target abort.
Table 7-13. Header Type Register
Bit(s) rw
Reset
Value Description/Function
7r 0
HDRTYPE[7]:
The AIC-6915 is a single function device
6:0 r 0
HDRTYPE[6:0]:
Always read 0.
Table 7-14. BIST Register
Bit(s) rw
Reset
Value Description/Function
7:0 r 0
BIST[7:0]:
Always read as 0.
Table 7-15. Base Address 0 Register
Bit(s) rw
Reset
Value Description/Function
31:19 r/w 0
BASEADR0[31:19]:
This field indicates the mapping capability of
512-KBytes of system memory space within the low 32-bit address
segment of the 64-bit address space.
18:4 r 0
BASEADR0[18:4]:
Indicates address space requirement, Always
read as 0.
3r 0
Prefetchable:
Always reads 0. Not supported.
2:1 r 10
MemorySpaceAccessType[1:0]:
Always read as 10. The AIC-6915 as
a target may be located anywhere in a 64-bit address space.
0r 0
Memory Space Indicator:
Always reads 0.
Note
: bit0 =0 indicates that BASEADR0 register is used for mapping
into system memory address space.