Why do I see combinationial loop warnings related to the Clocked Video Input megafunction? - Why do I see combinationial loop warnings related to the Clocked Video Input megafunction? Description Due to a problem in the Clocked Video Input megafunction in the Quartus® II software version 10.1 SP1 and earlier, you may see the following warning when performing static timing analysis in the TimeQuest Timing Analyzer: Warning: Found combinational loop of 6 nodes Warning: Node "<user hierarchy>|overflow_nxt~3|combout" Warning: Node "<user hierarchy>|avalon_st_output.packet_post_swap~0|datab" Warning: Node "<user hierarchy>|avalon_st_output.packet_post_swap~0|combout" Warning: Node "<user hierarchy>|overflow_nxt~4|datab" Warning: Node "<user hierarchy>|overflow_nxt~4|combout" Warning: Node "<user hierarchy>|overflow_nxt~3|dataa" This issue may also be flagged as a Critical Design Assistant Warning such as: Critical Warning: (Critical) Rule A101: Design should not contain combinational loops. Found 1 combinational loop(s) related to this rule. This problem is scheduled to be resolved in a future release of the Quartus II software. Resolution Although this issue is not expected to cause any functional issues, it is recommended to upgrade to a version of the Quartus II software later than 10.1 SP1 when possible. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 10.1.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']