Cadence First Encounter & flip flops

[mathi]

HI all,

I trying to do gate-level simulation after place and route. I saved the netlist from encounter but when i try to simulate it, it complains about too few arguments for flip flop instances, missing QN (complementary Q). I checked the library file and QN is declared there. Is there a way I can force encounter to have QN for flip flop instances?

Mathi

 

[satyakumar]

I too faced the same problem.

 

[VLSI Banker]

I THINK...


Your library has a provision for outputs, Q and QBAR for Flip - Flops,
ex : DFFCL01(D,clk,clr,Q,Qbar)

where as

in your design you might be using only Q of that as input to another instance.

ex : d1 (D,clk,clr,Q)
So, that will be only a warning that Qbar is not connected.

By the way, which technology are you using??

 

[satyakumar]

But simulator is not ignoring this warnings, for this we need to change rtl. becoz i can't change librarise
Thanks

 

[mathi]

I am using tsmc 0.18. Is there a way I can force encounter to include the Q bar as well? I don't want to change the code cause its 1000s of lines.

 

[ship_baba]

you give rst,clk,q,qb,d,preset