Link Power Management Settings

Setting

Description

PwrStateAccept

Specifies how the Exerciser replies in response to a Power Management states entry request in power state change link commands (LGO_U1, LGO_U2, and LGO_U3).

Bit 0 specifies that the Exerciser replies with the LAU link command on LGO_U1. Otherwise, it replies with the LXU link command.

Bit 1 specifies that the Exerciser replies with the LAU link command on LGO_U2. Otherwise, it replies with the LXU link command.

Bit 2 specifies that the Exerciser replies with the LAU link command on LGO_U3. Otherwise, it replies with the LXU link command.

Example: Set PwrStateAccept = AU1

Possible values are any combination of the following flags:
AU1 = 0x1 # Accept the request of entering U1 by sending LAU.
AU2 = 0x2 # Accept the request of entering U2 by sending LAU.
AU3 = 0x4 # Accept the request of entering U3 by sending LAU.
AU_ALL = (AU1 | AU2 | AU3)
AU_AUTO = 0x7 # AUTO mode. Reply to LGO_U1, LGO_U2, or
LGO_U3 based on the configured value through LMPs.

Default value: AUTO (0x7), so that the Exerciser accepts all power state change requests.

Applicable Mode: HOST, DEVICE

DisableLPMA

Specifies whether the Exerciser responds with the LPMA link command in response to LAU link commands. (This command is used in conjunction with LGO_Ux and LAU handshakes to guarantee that both ports are in the same state.)

Example: Set DisableLPMA = 1

Possible values are:
0 # Enables sending of LPMA in response to LAU. (Normal behavior)
1 # Disables sending of LPMA in response to LAU.

Default value: 0

Applicable Mode: HOST, DEVICE

DisablePMLCTimeout

Specifies whether the Exerciser link layer raises an error if the PM Link command is not received during specified timeout.

Example: Set DisablePMLCTimeout = 1

Possible values are:
0 # Enables detection of timeout on receiving response to PM Link command.
1 # Disables detection of timeout on receiving response to PM Link command.

Default value: 0

Applicable Mode: HOST

PMLCTimeout

Controls the timeout of receiving LC response during PM entry handshake, which is the time between LGO_U1, LGO_U2, or LGO_U3 to LAU or LXU and the time between LAU to LPMA.

Example: Set PMLCTimeout = 40

Possible values are:
number of nanoseconds for PMLC timeout.
0xFFFFFFFF # AUTO (as defined by spec)

Default value: AUTO (0xFFFFFFFF)

Applicable Mode: DEVICE, HOST