AR# 2367: M1.3 MAP: MAP DRC does not check the validity of RLOC and LOC location constraints on fast carry logic
AR# 2367
M1.3 MAP: MAP DRC does not check the validity of RLOC and LOC location constraints on fast carry logic
説明
Keywords: MAP, PAR, Fast Carry Logic, DRC, direction, loc, rloc
Urgency: Standard
Reference: 12929
General Description: The M1 Mapper does not check the validity of RLOC and LOC constraints attached to a fast carry logic chain, nor does it check that the directionality of a carry chain is valid for the given architecture. (4000E carry chains can be bidirectional, whereas 4000EX carry chains are unidirectional only.
ソリューション
These checks are done further down in the design flow at the beginning of the place and route stage by PAR, so invalid carry logic location constraints evnetually do get flagged by the tools.