How to check if a cell has a reset pin in Design Compiler?

[Atre]

recovery and removal checks for reset pins

Hello,

In Design Compiler, how is it possible to determine, on a cell, if it has a reset pin, which is that one, regardless the general reset. Is this possible?

Thanks in advance!

 

[au_sun]

Re: Reset pin

u have to identify what type of flipflops are used in ur design,
then know about the ports of that flipflop,
with that knowledge u can trace down the RESET signal

 

[sandusty]

Reset pin

In Design compiler, most of the time, reset/clock will be put in "DONT TOUCH" for those high fanout nets, so the buffer insertion/sizing will NOT perform on those signals.

In the later phase of the design, backend tools will finish the buffer insertion/ buffer sizing according to the layout...

 

[yasonwang]

Reset pin

You can check the removal/recovery arc to pick out the reset pin.

 

[dddain_bramage]

Re: Reset pin

You can check the removal/recovery arc to pick out the reset pin.

I believe that only works on asynchronous set/reset flipflops. For fully synchronous flops (no async inputs), there is no removal/recovery arc. And the synchronous set/reset pins aren't distinguishable from the data pin. But I suppose that depends on who generated your library-files.

If you examine the *.lib files (they are just text files), search for the flipflops in question, then see if the reset-pin has any special attributes. Then try to query those attributes from Design_Compiler.

 

[Atre]

Re: Reset pin

You can check the removal/recovery arc to pick out the reset pin.

I believe that only works on asynchronous set/reset flipflops. For fully synchronous flops (no async inputs), there is no removal/recovery arc. And the synchronous set/reset pins aren't distinguishable from the data pin. But I suppose that depends on who generated your library-files.

If you examine the *.lib files (they are just text files), search for the flipflops in question, then see if the reset-pin has any special attributes. Then try to query those attributes from Design_Compiler.

I'll try that.. thanks for the replies. ;-)

 

[JesseKing]

Reset pin

yes, synchronous set/reset pins are just the select signal of the mux multiplexing real data and 0/1 to D of DFF