The DS160PR1601
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.