In pin mode, the RX_DET = L1/L2/L4 sets the device in normal operation with PCIe state machine enabled. See RX Detect Control Registers in i²c mode. In the active PCIe mode, the PD pin is driven low in a system (for example, by PCIE connector PRSNTx# or fundamental reset PERST# signal). In active PCIe mode, the DS320PR410 redrives and equalizes PCIe Rx or Tx signals to provide better signal integrity.