31

0h

RO

Reserved

30

0x0

RW

Force MDID Override (FORCE_​MDID_​OVERRIDE)

When this bit is set, and bit 1 (the valid bit) is set, the value specified in this field will be used for MDID purposes. If this bit is clear, and bit 1 (the valid bit) is set, this value should be consumed along with the other MDID registers to determine which value is expiring next and reporting that value.

29

0x0

RW

Disable MDID Evaluation (DISABLE_​MDID_​EVALUATION)

Send a value of disabled to the PCH for the MDID field.

28:8

0x0

RW

Next Device Activity (NEXT_​DEVICE_​ACTIVITY)

These are in 1us increments and can report a maximum value of approximately 2 seconds

7

0x0

RW

Interrupt or Memory (IM)

0: Interrupt. This is a hint for the idle duration time to the next interrupt.
1: Memory. This is a hint for the idle duration time to the next snoop cycle.

6

0x0

RW

Opportunistic or Deterministic (OD)

0: Opportunistic. This is an opportunistic hint as suggested by the sub-system.
1: Deterministic. This is a deterministic hint as suggested by the sub-system.

5:2

0x0

RW

RESERVED (RESERVED_​BITS)

Driver must write 0000b to this field.

1

0x0

RW

(VALID)

0: This Idle Duration Override CSR is not valid
1: This Idle Duration Override CSR is valid

0

0x0

RW

(RESERVED)

Driver must write 0b to this field.