How to set a parameter in a Verilog module as a variable, and send it to the ADE Explorer to scan its different values in simulation?

Based on the simulation result chart, it seems that changing the string parameter did not have an effect. What would be the correct approach?

Dear wangyunxin,

wangyunxin said:

I named the parameter k in Verilog as ki, and gave it four different parameter values in the simulation: 20'b00000100000000000000, 20'b00001000000000000000, 20'b00010000000000000000, 20'b00100000000000000000, 20'b01000000000000000000. I wanted to see the simulation results of the circuit system under these four parameters, but ADE reported the following error. How can I solve this?

First of all, you mentioned changing the variable ki to 4 values,, but then listed five string values. I assume you intended to change it to each of the 5 values?

If so, have you tried changing your definition of variable to ki to:

strcat("20'b00000100000000000000" "20'b00001000000000000000" "20'b00010000000000000000" "20'b00100000000000000000" "20'b01000000000000000000")

You may need to escape the single quotation mark you included in the string, but I am not sure and am unable to test the expression.

Shawn

ShawnLogan said:

strcat("20'b00000100000000000000" "20'b00001000000000000000" "20'b00010000000000000000" "20'b00100000000000000000" "20'b01000000000000000000")

That's not going to work as it will just generate a single string with all five value concatenated. I suspect (without trying this - it's late here and I don't know how this model is using the values to test it appropriately anyway) that just using:

"20'b00000100000000000000","20'b00001000000000000000","20'b00010000000000000000","20'b00100000000000000000","20'b01000000000000000000"

would do the job though (i.e. with quotes around each value, and commas between them).

Andrew

Dear  Andrew
 I have try you said  using:

"20'b00000100000000000000","20'b00001000000000000000","20'b00010000000000000000","20'b00100000000000000000","20'b01000000000000000000"
  Although the simulator is divided into 5 simulations based on these different ki values, their simulation results are all the same. I suspect that the ki value has not been changed successfully.

Dear wangyunxin,

First of all, thank you Andrew for correcting my response! You are correct, I should have written:

strcat("20'b00000100000000000000" "," "20'b00001000000000000000" "," "20'b00010000000000000000"  ","  "20'b00100000000000000000"  ","  "20'b01000000000000000000")

However, based on your recent trial wangyunxin, might I suggest you change your verilog-A block to use a decimal input ki in lieu of the binary string? This will avoid this issue as you can set ki to the decimal equivalents of your 20 bit word. I am not sure if this is feasible, but thought I might at least suggest it to avoid the issue.

Shawn

ShawnLogan said:

strcat("20'b00000100000000000000" "," "20'b00001000000000000000" "," "20'b00010000000000000000"  ","  "20'b00100000000000000000"  ","  "20'b01000000000000000000")

That won't work either. You've now got a single string value (not a sweep) just with embedded commas in the string. It won't see this as a sweep... (as wangyunxin said, they have got the sweep working anyway - it's just not varying anything).

ShawnLogan said:

might I suggest you change your verilog-A block to use a decimal input ki in lieu of the binary string?

It's not a Verilog-A block by the looks of things. I think it's a Verilog (digital) view since the CDF filter on the edit properties form says "functional". CDF parameters are not normally passed to pure Verilog views without some extra work - see How to pass CDF parameters of an instance to its view when used as External HDL in AMS UNL (there's a link within that article too). Note that I don't have the time to build a test case to try this out - but you might want to look at the instance line in the netlist generated by ADE to see if it's actually passing "ki" to the instance of the block - if not, you'll need to try out the suggestions in the article I linked it.

My guess is that 

Andrew