SNLS579A April 2018 – November 2018 DP83TC811S-Q1
The DP83TC811S-Q1 enters silent mode once the sleep_rqst_timer expires or the PHY no longer detects activity on the MDI, indicating that the Link Partner has already moved to silent mode.
Silent mode is only an intermediate state prior to sleep. The PHY sets tx_mode = SEND_Z and (0,0) are transmitted on the MDI. If sleep enable, bit in the AUTO_PHY Register 0x018B – Autonomous PHY Control Register, is set and no energy is detected on the MDI for the duration of silent_timer (default = 8 ms), the DP83TC811S-Q1 will enter sleep mode. However, if energy is detected on the MDI prior to silent_timer expiration, the PHY enters standby mode.