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My board has two tlk1501 and SFP Fiber channels , and I test internal loopback and Transmit / Receive through a single fiber for each of them separatley , both of them can work normally, including hot-plug function as well. But when I excutive data communication between them, I will randomly have the data bit error each time after power on, for example, I send 16'h8000 at channel_A, but get 16'h0030 on the RXD on channel_B , or other value different from the source data, there is about 30% percent that you will encounter this problem.
I use a FPGA to control two fiber channels, and give the same 50Mhz TX_CLK signal from fpga internal PLL output.
And I find a strange issue when I take the communication between the two fiber channels, from the TLK1501 datasheet,we know that the RX_CLK is derived from the input serial data stream, but if I pull out the fiber , I still can measure the RX_CLK signal by oscilloscope, is this normal?
