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RTL compiler to minimize area

Hamzah

Hello all,

 

I am using RTL compiler to synthesize a pure combiniational digital designs. I would like to know how to constraints the synthesis tool to minimize the Area as its first periority or even may be the only periority.

 

The shell script I use to synthesis my designs is:

#/bin/sh

SYN_ID=$2

FILE=$1

SYN_TOOL=rc

RC_REPORT=/tmp/syn.$SYN_ID.rpt

AREA=/tmp/syn.$SYN_ID.area

$SYN_TOOL > $RC_REPORT << EOF

set_attribute lib_search_path ../../../Digital_Standard_Cell_Library/synopsys/models

set_attribute library {saed90nm_typ.lib}

read_hdl $FILE

set_attribute avoid true LNANDX1 LNANDX2

elaborate

synthesize -to_generic

synthesize -to_mapped

synthesize -to_mapped

synthesize -to_mapped

synthesize -to_mapped

synthesize -to_mapped -effort high

write_hdl -mapped > /tmp/syn.$SYN_ID.v

echo [get_attribute area /designs/*]> $AREA

quit

EOF

 How can I constraint the RC to minimize the area as much as possible?

Alos, I have some designs that desribes in truth tables format (Berkeley PLA format), How can I read these designs with cadence?

 

Thanks a lot. 

Parents

  • Is there no way to focus on Area on Cadence?

    I have worked more with Synopsys and the tool does not do it very well, it automatically tries to synthesize for speed no matter what you do. There you can ease it a bit by making relaxed timing constraints and use the "set_max_area 0" command. Then you do a "set_max_area" to 10% less than the result and do an incremental synthesis and squeeze a bit more. That is Synopsys though, not Cadence. Cadence does not support the set_max_area command.

     Back to the combinatorial code though, you might want to be careful as these synthesis tools should not have too much freedom. The quality can drop quite a bit when you have no constraint at all. The rule at work then was to just put some constraint in to force the tool to do some effort as it stops as soon as all constraints are matched.

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  • Is there no way to focus on Area on Cadence?

    I have worked more with Synopsys and the tool does not do it very well, it automatically tries to synthesize for speed no matter what you do. There you can ease it a bit by making relaxed timing constraints and use the "set_max_area 0" command. Then you do a "set_max_area" to 10% less than the result and do an incremental synthesis and squeeze a bit more. That is Synopsys though, not Cadence. Cadence does not support the set_max_area command.

     Back to the combinatorial code though, you might want to be careful as these synthesis tools should not have too much freedom. The quality can drop quite a bit when you have no constraint at all. The rule at work then was to just put some constraint in to force the tool to do some effort as it stops as soon as all constraints are matched.

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