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Design Languages >> Verilog-AMS >> parameters in analog function
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Message started by spinfab on Jul 22^nd, 2013, 2:14am

Title: parameters in analog function
Post by spinfab on Jul 22^nd, 2013, 2:14am

Hello,

Is it possible to get parameters (declare with: parameter real a 1.0) or globals variables (declare with: real b ) in an analog function without passing these var in the function argument.
instead writing if
myAnlogFunction(x, a, b)
i would prefer it
myAnlogFunction(x).

Thanks for your help

fab

Title: Re: parameters in analog function
Post by Geoffrey_Coram on Jul 23^rd, 2013, 12:56pm

In the LRM (version 2.3.1) section 4.7.1:

An analog user defined function:
...
— shall only reference locally-defined variables, variables passed as arguments, locally-defined parameters and module level parameters; and
— If a locally-defined parameter with the specified name does not exist, then the module level parameter of the specified name will be used.

Sounds like you can get module-level parameters, but not variables.

Title: Re: parameters in analog function
Post by spinfab on Jul 24^th, 2013, 12:02am

indeed but I got an error with spectre
ERROR (VACOMP-1008): Cannot compile ahdlcmi module library. Check the log file input.ahdlSimDB/3605_sdk_models_model_source_XXXXX.va.spitt_v1.ahdlcmi/Linux/../ahdlcmi.out for details. If the compiler ran out of memory, use 'setenv CDS_CMI_COMPLEVEL 0', and try again. If the reason for the failure was a syntax error, contact your Cadence Customer Support representative with the netlist, log files, behavioral model files, and any other information that can help identify the problem.
ERROR (SFE-91): Error when elaborating the instance XXXX. Simulation should be terminated.

Title: Re: parameters in analog function
Post by Geoffrey_Coram on Aug 2^nd, 2013, 8:48am

You can check the Spectre documentation; maybe this is a known limitation. Either way, you should contact them and demonstrate your need.