SNLS579A April 2018 – November 2018 DP83TC811S-Q1
Sleep Request state can be entered when valid LPS code-groups are received on the MDI from a Link Partner.
The PHY will not be permitted to transmit LPS code-groups unless the registers below are set.
To enable LPS code-group transmission, the LPS transmission enable bit must be set in AUTO_PHY Register 0x018B – Autonomous PHY Control Register.
The Sdn scrambler stream must be enabled by setting bits[9:8] = 0b11 in LPS_CFG Register 0x04E5 – LPS Configuration Register.
LPS code-group identification within the PCS layer must be enabled by setting bit in LPS_CTRL2 Register 0x0487 – LPS Control Register #2.
LPS code-groups are sent once Sleep Request is enabled by setting bit in PWRM Register 0x018C – Power Mode Register.