Answers Database

M1: NOCLIP, S, NOMERGE, X and KEEP properties


Record #2501

Product Family:  Software

Product Line:  Merged Core

Problem Title:
M1: NOCLIP, S, NOMERGE, X and KEEP properties


Problem Description:
Keywords: properties attributes savesig, NOCLIP, S, NOMERGE, X,
KEEP

Urgency: hot

General Description:
In M1, there may be some confusion on these properties:
NOCLIP, S, NOMERGE, X and KEEP.  These are different ways
of specifying that signals not be trimmed or that they not
be merged into CLB function generators.


Solution 1:


The chart below explains the relationship between
these property names:


XACT	      Foundry	     M1        function
-----------   -----------   ---------  -----------------------
S (savesig)   NOCLIP	    S	       prevents loadless and
				       sourceless nets from
				       being trimmed; NOTE:
				       does not prevent
				       trimming of
				       nets attached to
				       disabled logic.

X	      NOMERGE	    KEEP       prevents a net from
				       being merged into a CLB



End of Record #2501