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AR# 5035

M1.5 Spartan mapper can not fit design that fit in M1.4.

Description

A case has been seen where the M1.5 mapper does not fit a
design that could be fin in M1.4. It does not appear to be
doing enough unrelated merging to fit the design.

M1.4 used 97/100 CLBs with "5 unrelated functions combined,
affecting 3 CLBs (3%)".

M1.5 used 101/100 CLBs with "One unrelated function packed
into a CLB".

Solution

The design does fit if the M1.4 results are used to guide mapping, so this is a possible work around.

AR# 5035
Date Created 08/31/2007
Last Updated 10/05/2008
Status Archive
Type General Article