AR# 68754

LogiCORE IP SMPTE UHD-SDI v1.0 (Rev. 3) 2016.4 - Why does the rx_mode_locked and rx_t_locked keep toggling when the SDI cable is not connected?


When there is no Video Source connected, rx_mode_locked and rx_t_locked keeps toggling. What can cause this problem?


The problem is caused by a known issue for GT : (Xilinx Answer 68379)

It is fixed in the 2017.1 release. 

The patch for 2016.4 can be downloaded from (Xilinx Answer 68741).

GT sometimes outputs a non null RXDATA when no cable is connected. The pattern of RXDATA is valid Data, so rx_mode_locked and rx_t_locked are asserted.

However, if the data pattern does not contain valid xyz logic, then rx_mode_locked and rx_t_locked lose lock after they are asserted.

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AR# 68754
Date 05/05/2017
Status Active
Type General Article