8.4.11.7 State Transition #7 - Silent to Standby
Standby state can be entered by any of the following methods:
- Standby enable, sleep is disabled by setting bit[1] = 0b0 in the AUTO_PHY Register 0x018B – Autonomous PHY Control Registerand silent_timer expired
- MDI Detection, Non-SEND_Z code-groups detected on the MDI prior to silent_timer expiration