TUSB211A will detect an HS compliance test fixture and enter the downstream port high-speed eye diagram test mode. CD pin will be low and ENA_HS pin is asserted high when TUSB211A is in HS eye compliance test mode.

If the RSTN pin is asserted low and de-asserted high while TUSB211A is operating in HS functional mode, then TUSB211A will transition to HS eye compliance test mode, the CD asserts low, and ENA_HS remains high. When all this occurs, signal compensation is enabled.