Datasheet

Processor Configuration Registers
14 Datasheet, Volume 2
2.2 PCI Devices and Functions on Processor
Note:
1. Not all devices are enabled in all configurations.
2. See Section 2.8.2, “DID2—Device Identification Register” for additional information on graphics DID
values.
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.
RW
Description DID Device Function
DRAM Controller
0100h
00
PCI Express Controller 0101h 1 0
PCI Express Controller 0105h 1 1
PCI Express Controller 0109h 1 2
Integrated Graphics Device
2
0102h
20
PCI Express Controller 010Dh 6 0