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That does not work in practice.
After doing what you suggest in the assignment editor, and rerunning synth&elab, the reg is still not available in Node Finder under any of the Signaltap II filters. It is only available under the post-synthesis filter.
Likewise for when adding /* synthesis syn_noprune */ directive.
Does this capability actually work, or is it just in the manuals?
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Ive had it working fine.
In VHDL - best way to do it is to do this:
noprune VHDL Synthesis Attribute signal reg1: stdlogic;
attribute noprune: boolean;
attribute noprune of reg1: signal is true;
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