Add instance constraints command

[nohj_yar]

Hi all!

I am using this command:
add instance constraints 0 fab_reg -module sram_bin_bit_jet -replace -revised

fab_reg is a register in module sram_bin_bit_jet..

Does this mean that ALL fab_reg register in module sram_bin_bit_jet in my entire design will be constrained to 0?

THanks..

 

[sharath666]

Only that single register will have the constraints as 0...

 

[nohj_yar]

Only that single register will have the constraints as 0...

but in my design, i have multiple module sram_bin_bit_jet that have fab_reg, will it not affect other fab_reg in other module of sram_bin_bit_jet?

 

[sharath666]

Well, actually you have to specify the instance name along with the hierarchy. So you can specify which instance you actually want to apply the command..

 

[nohj_yar]

Well, actually you have to specify the instance name along with the hierarchy. So you can specify which instance you actually want to apply the command..

yeah... i already tried that. also, i've tried invoking this commands:

add instance constraints 0 fab_reg -module sram_bin_bit_jet -replace -revised

add instance constraints 1 /b_l_blck/rap/row_9_/mim_4_/i1/II/fab_reg -replace -revised
add instance constraints 1 /b_l_blck/wrap/row_9_/mim_5_/i1/II/fab_reg -replace -revised
....(other the same commands)

but i got this warning?
Warning: Instance /b_l_blck/rap/row_9_/mim_4_/i1/II/fab_reg has conflicting constraint. Skip
// Warning: Instance /b_l_blck/wrap/row_9_/mim_5_/i1/II/fab_reg has conflicting constraint. Skip
......(other the same warning)

my question is that if the command add instance constraints 0 fab_reg -module sram_bin_bit_jet -replace -revised affects only one fab_reg, why is there a conflict on other fab_reg on the other paths that i used?

 

[sharath666]

Don't use -module option. Use the proper instance name instead. When you use -module, it will apply it to all modules.
Secondly the warning is shown because you are trying to remove all constraints using 1 command and you are trying to add constraints using another. It is a conflict.So decide whether you want to add or remove constraints.