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DS90UB948-Q1: GPIO1 vs DGPIO1 for heartbeat signal from DES to SER

nICK Wu
Prodigy 20 points
Part Number: DS90UB948-Q1
Other Parts Discussed in Thread: DS90UH947-Q1,

I have a DS90UB948-Q1 and DS90UH947-Q1 pair for LVDS, interrupt function, pass-through, and heartbeat signals. I am trying to understand if I should use GPIO1 or DGPIO1 to transport a heartbeat signal 40/60/120 Hz from the DES side to the SER side. Thanks!

  • 0
    TI__Expert 4160 points

    Hi Nick,

    Thank you for your question. 

    Since the BC is Manchester encoded, then the effective bit rate = the signaling rate. Meaning since your signaling rate is 40/60/120 Hz, you will need a bit rate of 40bps, 60bps, or 120bps. 

    The bit rate for general BC GPIO[3:0] is fixed at 133kbps. The effective bit rate for GPIO0 is 133/4= 33.25kbps. So, normal GPIO (@33.25kbps) is 33kHz. Using GPIO1 is enough for your application

    Best regards,

    William Y.