Solved: Preserve register for signal tap debug - Intel Community

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Preserve register for signal tap debug

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Unable to preserve register with no fan out using following:

set_instance_assignment -name PRESERVE_REGISTER ON -to reg1

set_instance_assignment -name PRESERVE_FANOUT_FREE_NODE ON -to reg1

similar result using assignment editor - can't find reg1 available at pre-synthesis

1 Solution

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solution found:

reg reg1 /*synthesis noprune */;

BR,

Mark.

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solution found:

reg reg1 /*synthesis noprune */;

BR,

Mark.

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Mark,

You may refer to below link for preserving register nodes using noprune in your hdl

https://www.intel.com/content/www/us/en/programmable/quartushelp/17.0/hdl/vlog/vlog_file_dir_noprune.htm

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