A junior used my transmitted board which fixed TLK2711A.He told me : if the TLK2711A was active PRBS , the RXD data bus sychornized with RX_CLK.
He used FPGA to capture these data.He think these datas were a loop array.He set two experiments.
1. Used a single board to loopback.
a.TLK2711A set PRBS valid, board connect(2711A Serdes OUT and IN) din and dout(P to P,N to N).Used board FPGA to capture TLK2711A export .
2.Used a couple board
a. Board A set PRBS valid,Board B set as receiver.Board A dout connet to board B din.Used the FPGA on board B to capture RXD_BUS.
He told me these experiments show different result.In my thought , the both experiment should captured same datas.
BTW, single board experiment , RKLSB hold high( PRBS passed)
I am curious about these result.
Anyone can explain the question?
