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I am trying to characterize a differential receiver using elc by using a gate model to specify the cell's behaviour. For the gate file, I copied the example given in the user guide, since its behaviour is the same as our custom cell:
DESIGN (DIN); //PORT SECTION; INPUT P (P); INPUT N(N); OUTPUT Y (Y); SUPPLY1 VDD (VDD); SUPPLY0 VSS (VSS); COMPLEMENTARY P, N; //GATE SECTION AMP (Y, P, N);END_OF_DESIGN;
However, I get the following warning right after the db_gsim command:
-----------------------------------[WARNING(db_gsim)] illegal line in gate file : COMPLEMENTARY P N[WARNING(db_gsim)] The gate file will not be used for circuit recognition. ------------------------------------
If I remove the "complementary" statement, the simulation vector inputs are not differential, and are therefore not valid for characterization.
I tried using "db_diff DIN P N" before the call to db_gsim instead, with no changes in the results. We are using version v08.13-s001_1 - linux_x86 32-bit.
Any ideas how to correct this situation?