How to report removed registers in Dc

[keertiprasad1]

Hi. Could anybody please tell me whether there is any command in DC to report removed registers in the design.

Thanks

 

[kornukhin]

During execution "compile" command information about all removed registers priniting to the console:

Information: The register 'dsample_out_reg[32]' is a constant and will be removed. (OPT-1206)
Information: The register 'dsample_out_reg[33]' is a constant and will be removed. (OPT-1206)
Information: The register 'dsample_out_reg[34]' is a constant and will be removed. (OPT-1206)

I never see separate command for this.

 

[keertiprasad1]

Ok Thanks.. But just thought there should have been some command to report this.. I tried searching in Solvnet. No hints!!

Thanks

 

[chipmonkey]

By default DC will give a (OPT-1206) warning for all the registers that are removed while optimization.
However if you have certain variables such as compile_seqmap_propagate_high_effort set as false in your synthesis script, then DC will not perform this optimization and hence this message wont appear.

 

[jpvSoccer]

Have you tried running check_design before you compile?

This report has a lot of useful information in it including info about unused sequential cells.

 

[keertiprasad1]

Ya i have tried giving check design but it has only issues such as some nets, ports are connected to ground, multilple pins,ports but doesnt give any info regarding the removed reg.