Datasheet

Processor Configuration Registers
16 Datasheet, Volume 2
2.2 PCI Devices and Functions
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 Reset 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" using 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, and so on).
-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.
Table 2-3. PCI Devices and Functions
Description DID Device Function
DRAM Controller 0154h 0 0
PCI Express* Controller 0151h 1 0
PCI Express Controller 0155h 1 1
PCI Express Controller 0159h 1 2
Integrated Graphics Device 0156h 2 0
PCI Express Controller 015Dh 6 0