82G33 datasheet(211/437 Pages) INTEL

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PCI Express* Registers (D1:F0)

Datasheet

211

Bit

Access &

Default

Description

Clock Power Management (CPM): A value of 1b in this bit indicates

that the component tolerates the removal of any reference clock(s)

when the link is in the L1 and L2/3 Ready link states. A value of 0b

indicates the component does not have this capability and that

reference clock(s) must not be removed in these link states.

This capability is applicable only in form factors that support “clock

request” (CLKREQ#) capability.

For a multi-function device, each function indicates its capability

independently. Power Management configuration software must only

permit reference clock removal if all functions of the multifunction

device indicate a 1b in this bit.

17:15

RWO

010b

L1 Exit Latency (L1ELAT): This field indicates the length of time this

Port requires to complete the transition from L1 to L0. The value 010

b indicates the range of 2 us to less than 4 us.

Both bytes of this register that contain a portion of this field must be

written simultaneously in order to prevent an intermediate (and

undesired) value from ever existing.

14:12

100b

L0s Exit Latency (L0SELAT): Indicates the length of time this Port

requires to complete the transition from L0s to L0.

000 = Less than 64 ns

001 = 64ns to less than 128ns

010 = 128ns to less than 256 ns

011 = 256ns to less than 512 ns

100 = 512ns to less than 1 us

101 = 1 us to less than 2 us

110 = 2 us – 4 us

111 = More than 4 us

The actual value of this field depends on the common Clock

Configuration bit (LCTL[6]) and the Common and Non-Common clock

L0s Exit Latency values in PEGL0SLAT (Offset 22Ch)

11:10

RWO

11b

Active State Link PM Support (ASLPMS):

00 = Reserved

01 = L0s is supported

10 = Reserved

11 = L1 and L0s are supported

9:4

10h

Max Link Width (MLW): This field indicates the maximum number of

lanes supported for this link.

3:0

Max Link Speed (MLS): Hardwired to indicate 2.5 Gb/s.

82G33 Datasheet(PDF) 211 Page - Intel Corporation

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