The DS320PR1601
deploys an Rx detect state machine that governs the Rx detection
cycle as defined in the PCI express specifications. At power up,
after a manually triggered event through PDx pins, or writing to
the relevant I2C/SMBus register, the redriver
determines whether or not a valid PCI express termination is
present at the far end of the link. The Rx Detect Registers
provide additional flexibility for system designers to
appropriately set the device in desired mode through
SMBus/I2C control interface.