31

0h

RO

Reserved

30

0h

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

0h

RW

Disable MDID Evaluation (DISABLE_​MDID_​EVALUATION)

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

28:8

0h

RW

Next Device Activity (NEXT_​DEVICE_​ACTIVITY)

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

7

0h

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

0h

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

0h

RO

Reserved

1

0h

RW

(VALID)

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

0

0h

RO

Reserved