Technical information

7-9
Register Descriptions
PCI DEVREVID (Device Revision ID) Register
Type: R
Internal Registers Subgroup: PCI Configuration Header
Byte Address: 08h
PCI Proginfc (Program Interface) Register
Type: R
Internal Registers Subgroup: PCI Configuration Header
Byte Address:09h
PCI Subclass Register
Type: R
Internal Registers Subgroup: PCI Configuration Header
Byte Address: 0Ah
Table 7-7. Device Revision ID Register
Bit(s) rw
Reset
Value Description/Function
7:0 r 03h
DEVREVID[7:0]:
Always read as 3h or higher. The Device Revision
ID identifies the revision level of a PCI device. Device Revision
values change in metal only.
Table 7-8. Program Interface Register
Bit(s) rw
Reset
Value Description/Function
7:0 r 00h
PROGINFC[7:0]:
The Program Interface register value identifies the
specific register-level programming interface the agent supports. The
PROGINFC
for the first version of the AIC-6915 is identified as 00h.
Table 7-9. Subclass Register
Bit(s) rw
Reset
value Description/Function
7:0 r 00h
SUBCLASS[7:0]:
The SubClass register identifies which SubClass
the PCI device is assigned to. The
SUBCLASS
for the first version of
the AIC-6915 is identified as 00h (Ethernet controller). This value
can be changed to a value read from an external serial EEPROM if
the
BR_A1
pin is ‘1’ when
PCI_PCIRST_
is deasserted.