【problem description】: DM8168 has only one PCIE device FPGA outside, and FPGA can be loaded normally
1. after power up, DM8168 PCIE can't find device FPGA. The measurement signal finds that DM8168 sends out PCIE differential signal, but it doesn't send out signal after a period of time. After that, there is no signal and will not initiate the building chain signal.
2.DM8168 TX difference pair is connected to the ground resistance to the ground, and the DM8168 will continuously send out the detection of the chain signal and will not be interrupted.
3. by querying the state of the FPGA related PCIE register, the current state is in the Polling.Active state, and the FPGA is constantly sending out PCIE differential signals
【help】:
1.When DM8168 detects the PCIE device and sends the chain signal, under what conditions can it no longer send PCIE signal, and it will not redetect the building chain, and how to restart the chain by way of any other way.
2.DM8168 sends out the chain signal and breaks it. After querying DM8168, which registers can determine the current state of DM8168 PCIE module, or by any way, we can know the current PCIE scanning error.
