Hardware Debug - 2.0 English

Versal ACAP GT Controller for DisplayPort and SDI LogiCORE IP Product Guide (PG398)

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2.0 English

Hardware issues can range from link bring-up to problems seen after hours of testing. This section provides debug steps for common issues. The Vivado® debug feature is a valuable resource to use in hardware debug. The signal names mentioned in the following individual sections can be probed using the debug feature for debugging the specific problems.

GT Clocking
  • Make sure PLLs are reset before initiating the IP.
  • Monitor the PLL LOCK signal.
  • Verify that PLL input clock frequency is of expected value.
  • It is mandatory to reset the PLL if clock input to PLL is stopped or unstable.
  • Make sure to use PLL default settings from the latest GT Wizard IP core based on the target device.
  • Measure RXOUTCLK is of expected frequency.
  • Make sure RXOUTCLK of the transceiver is the clock driving rx_usrclk, RXUSRCLK, and RXUSRCLK2.
  • Monitor RXBUFFSTATUS[2:0] for overflow and underflow errors.
GT Initialization
  • GTRXRESETDONE is asserted high after GT completes initialization.
  • Make sure GT is not reset during normal operation.
  • Follow the recommended GT reset sequence.