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TMS320F280039C: USE CLB to Passthrough FSI RX_C and RX_D signal to others GPIOs (CLB OUTPUTXBAR)(Abnomal waves: CLB Output is not same as input)

NAN LI
Prodigy 80 points
Part Number: TMS320F280039C
Other Parts Discussed in Thread: TMDSFSIADAPEVM

Hello Every One!

I have some problems when use CLB to passthrough FSI signal.

Device: F280039C Launchxl Pad + TMDSFSIADAPEVM.

Config GPIO_54 as FSI_RXCLK, GPIO_52 as FSI_RX0. at the same time, Config CLB INPUTXBAR: the Source of XBAR_INPUT1 is GPIO54, the source of XBAR_INPUT2 is GPIO52.

Config CLB OUTPUTXBAR, Pin78 as CLB1 OUT0, Pin79 as CLB1 OUT1

The problems is that the CLB output is not same as FSI RX_CLK，we need some help to sovle this, or if this usage is allowed.

The figure yellow line is FSI RX_CLK, Green line is Passthrough signal use CLB internal

fsi_ex8_ext_p2pconnection_tx.zip

  • +1
    TI__Genius 14131 points

    Hi Nan,

    Thank you for reaching out on E2E forums. You are referring to the 2 missed CLK cycles? Do you have sync input enabled for your CLB inputs? Since the signal is coming through the XBAR, it will be asynchronous to the CLB and this may be what is causing your issue

    Regards,

    Peter

  • 0 in reply to Peter Luong1
    Prodigy 80 points

    OK，Thank you Peter，When Enable sync Input，it is OK, but delay more， Anyway thank you a lot!