Has anyone else encountered a problem where the simulator (Cadence AMS) gives an error, if you change any of the parameters in a component from the schematic properties-view?

The error it gives is:


ncelab: *E,CUBSPA (./ihnl/Buck_vcm/Buck_voltage/schematic/verilog.vams,26||44): Assigment of string to real or integer type parameter.

The code is:

/Verilog-AMS HDL for "Buck_vcm", "Compensator" "verilogams"


`include "constants.vams"
`include "disciplines.vams"


module Compensator ( Vref, Vin, Vout);


input Vref, Vin;

output Vout;


parameter real Pole_a = 10;

parameter real Pole_b = 100e4;

parameter real Pole_c = 100e5;

parameter real Zero_a = 1000;

parameter real Zero_b = 20e3;


parameter real Gain_dB=20;


real PI=3.14159265;

real Poles[0:5];

real Zeros[0:3];

real Gain;






electrical Vin, Vref, Vout;

 
 analog begin



  Gain = pow(10,(Gain_dB/20));


  Poles[0] = -2*PI*Pole_a;

  Poles[1] = 0;

  Poles[2] = -2*PI*Pole_b;

  Poles[3] = 0;

  Poles[4] = -2*PI*Pole_c;

  Poles[5] = 0;

 Zeros[0] = -2*PI*Zero_a;

  Zeros[1] = 0;

  Zeros[2] = -2*PI*Zero_b;

  Zeros[3] = 0;

  V(Vout) <+ Gain*laplace_zp(V(Vref,Vin),Zeros,Poles);


 end



endmodule

If I don't touch the properties, the simulation is completed normally.

So it would be bug in software itself?

How should one go about fixing the issue?

Geoffrey_Coram wrote on Feb 11^th, 2011, 4:06am:


Yes, I created the symbol myself and was not aware that I have to define the CDF parameters outside of the verilog-ams code.

In the code the are defined: "parameter real nameofparameter".

Or then I'm 'missing' something here. Could you please elaborate on the subject of the CDF parameters?

Thanks for the info so far.

Here you go:


/****************************************************/
LIBRARY = "Buck_vcm"
CELL    = "Compensator"
/****************************************************/

let( ( libId cellId cdfId )
   unless( cellId = ddGetObj( LIBRARY CELL )
       error( "Could not get cell %s." CELL )
   )
   when( cdfId = cdfGetBaseCellCDF( cellId )
       cdfDeleteCDF( cdfId )
   )
   cdfId  = cdfCreateBaseCellCDF( cellId )

   ;;; Parameters
   cdfCreateParam( cdfId
       ?name           "Pole3"
       ?prompt         "Pole3"
       ?defValue       "1e+07"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Pole3)"
       ?parseAsNumber  "yes"
       ?parseAsCEL     "yes"
   )
   cdfCreateParam( cdfId
       ?name           "Gain"
       ?prompt         "Gain"
       ?defValue       "0"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Gain)"
   )
   cdfCreateParam( cdfId
       ?name           "Pole1"
       ?prompt         "Pole1"
       ?defValue       "10"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Pole1)"
   )
   cdfCreateParam( cdfId
       ?name           "Zero1"
       ?prompt         "Zero1"
       ?defValue       "100"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Zero1)"
   )
   cdfCreateParam( cdfId
       ?name           "Pole2"
       ?prompt         "Pole2"
       ?defValue       "100"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Pole2)"
   )
   cdfCreateParam( cdfId
       ?name           "Zero2"
       ?prompt         "Zero2"
       ?defValue       "1"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Zero2)"
   )
   cdfCreateParam( cdfId
       ?name           "Pole"
       ?prompt         "Pole"
       ?defValue       "10"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Pole)"
       ?parseAsNumber  "yes"
       ?parseAsCEL     "yes"
   )
   cdfCreateParam( cdfId
       ?name           "Pole_b"
       ?prompt         "Pole_b"
       ?defValue       "7.9477e+06"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Pole_b)"
   )
   cdfCreateParam( cdfId
       ?name           "Pole_c"
       ?prompt         "Pole_c"
       ?defValue       "2e+12"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Pole_c)"
   )
   cdfCreateParam( cdfId
       ?name           "Zero_a"
       ?prompt         "Zero_a"
       ?defValue       "0.1"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Zero_a)"
   )
   cdfCreateParam( cdfId
       ?name           "Zero_b"
       ?prompt         "Zero_b"
       ?defValue       "794770"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Zero_b)"
   )
   cdfCreateParam( cdfId
       ?name           "Pole_a"
       ?prompt         "Pole_a"
       ?defValue       "1e-05"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Pole_a)"
   )
   cdfCreateParam( cdfId
       ?name           "Gain_dB"
       ?prompt         "Gain_dB"
       ?defValue       "0"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Gain_dB)"
   )

   ;;; Properties
   cdfId->formInitProc            = ""
   cdfId->doneProc                = ""
   cdfId->buttonFieldWidth        = 340
   cdfId->fieldHeight             = 35
   cdfId->fieldWidth              = 350
   cdfId->promptWidth             = 175
   cdfId->viewInfo                = '(nil verilogams (nil moduleName "Compensator" namePrefix "ahdl"
termOrder (Vref Vin Vout) parameterList (Pole_a Pole_b Pole_c Zero_a Zero_b
   Gain_dB
)
)
)
   cdfSaveCDF( cdfId )
)

JussiS wrote on Feb 11^th, 2011, 5:39am:


How did you create the symbol?  Did you use "create cellview from cellview" or something?  (I've never made a symbol for a Verilog-AMS module myself.)  I would think that, if the CDF parameters for the symbol were automatically generated from the .vams file, then they should have the right data type.

Geoffrey_Coram wrote on Feb 14^th, 2011, 5:59am:


I first created the Verilog-AMS cellview and after saving and closing the file, Cadence says, that no symbol exists, would you like to create it?

Click yes and the symbol view appears in the listing of the components views.

I meant Andrew Beckett, who responded earlier in this thread.

JussiS,

the output of cdfDump looks like a SKILL script to me, so you should try to just run it. But you could also use the CDF tool to change this directly with the GUI.
BTW, you could also leave the parameter type as string and change the parseAsNumber...
Code:

cdfCreateParam( cdfId
       ?name           "Pole3"
       ?prompt         "Pole3"
       ?defValue       "1e+07"
       ?type           "string"
       ?display        "artParameterInToolDisplay('Pole3)"
       ?parseAsNumber  "yes"  ;; needed for all numeric values w type=string
       ?parseAsCEL     "yes"     ;; may also be needed
... 

Does this help?
B O E