Processor Configuration Registers
14
Datasheet, Volume 2
2.2
PCI Devices and Functions on Processor
Note:
Not all devices are enabled in all configurations.
Table 2-2.
Register Attribute Modifiers
Attribute
Modifier
Applicable
Attribute
Description
S
RO (w/ -V)
Sticky:
These bits are only re-initialized to their default value by a "Power Good
Reset".
Note:
Does not apply to RO (constant) bits.
RW
RW1C
RW1S
-K
RW
Key:
These bits control the ability to write other bits (identified with a 'Lock'
modifier)
-L
RW
Lock:
Hardware can make these bits "Read Only" via a separate configuration
bit or other logic.
Note:
Mutually exclusive with 'Once' modifier.
WO
-O
RW
Once:
After reset, these bits can only be written by software once, after which
they become "Read Only".
Note:
Mutually exclusive with 'Lock' modifier and does not make sense with
'Variant' modifier.
WO
-FW
RO
Firmware Write:
The value of these bits can be updated by firmware (PCU,
TAP, etc.).
-V
RO
Variant:
The value of these bits can be updated by hardware.
Note:
RW1C and RC bits are variant by definition and therefore do not need
to be modified.
Description
DID
Device
Function
DRAM Controller
0100h
0
0
PCI Express Controller
0101h
1
0
PCI Express Controller
0105h
1
1
PCI Express Controller
0109h
1
2
Integrated Graphics Device
0102h
2
0
PCI Express Controller
010Dh
6
0
