Accelerated Graphics Port Interface Specification

AGP3.0 Interface Specification
Rev. 1.0
127
5.8.3 NCAPID: AGP IDENTIFIER REGISTER
Offset: CAPPTR
Size: 4 bytes
Table 63: Identifier Table
Bits Access Field Description
31:24 RZ-IW Reserved Always returns 0 on read; write operations have no effect.
23:20
R-IW-
D’0011
MAJOR Major revision number of AGP3.0 specification this device
conforms to. A Value of 3 or greater Indicates AGP3.0.
19:16
R-IW-
D’0101
MINOR Minor revision number of AGP3.0 interface specification to
which this device conforms. Range for minor revision for
Appendix (Enhanced) register specifications is 5h-9h. First
release will use 5h
15:8
R-IW-Dx
NEXT_PTR Pointer to next item in capabilities list. Must be NULL for final
item in list.
7:0
R-IW-
D’CAPID
Value
CAP_ID The value of this field is determined as follows:
Location of Registers CAPID Value
AGP Target Host –to-PCI
Bridge
00000010
AGP Target PCI-to-PCI
Bridge
NEW ID
AGP Master 00000010
AGP CAP_ID is retained for backward compatibility for configuration registers located in the Host
Bridge. A new CAP-ID will be used for configuration registers located in a P2P Bridge. The
NEXT_PTR field contains a pointer to the next item in the list. The NEXT_PTR field in final list
item must contain a NULL pointer.