[Asynch Reset] Find active low or active high

[maulin sheth]

Hello All,

How to find the asynchronous reset is active high or active low in the design using Design Compiler?

As Top level reset port is connected through inverter to some sequential logic and sometimes it is connected through non inverted...so how to find this...specifically in DC.

Thanks & Regards,
Maulin Sheth

 

[iwpia50s]

If you can you trace the path from the reset port to the reset pin on the sequential cell then the logic unateness will show you.

 

[maulin sheth]

If you can you trace the path from the reset port to the reset pin on the sequential cell then the logic unateness will show you.

Thanks for replying..
Yea..that is true..But I Want to use it as a last option...
Do you know any commands or logic or script to find this in DC Compiler?

 

[OhaAmo]

Look at a flop which connects directly to the reset port. You can determine if the reset is active low or high by the flop reset type definition.