Answers Database

M1.3/M1.4 MAP: Running map with -os area may yield a larger implementation than with -oe normal


Record #2260

Product Family:  Software

Product Line:  Merged Core

Problem Title:
M1.3/M1.4 MAP:  Running map with -os area may yield a larger
implementation than with -oe normal



Problem Description:
Keywords:  map, -os, area, -oe, normal utilization optimization

Urgency:  Hot

General Description:  Running map with the -os area option
may result in a larger implementation than when running with
the default -oe normal option.



Solution 1:

The -os optimization options in the M1.3 Mapper do not
guarantee that you will always get a better result than
processing a design without optimization. In general,
the -os options will tend to give you better results
when used in conjunction with tools such as Metamor and
ABEL logic synthesis, since these tools do not do any
FPGA-specific lookup table optimization.

If you find that -os area is gives you a larger
implementation than -oe normal, you should simply reprocess
the design with the default settings.

Bug Reference #: 17427
R_Stm



End of Record #2260