non-uniform sampling of a signal

 Hi Svilen,

You could create a Verilog-A or Verilog-AMS module that uses an @cross statement to monitor the crossing of a threshold - this would be the signal whose falling edge you want to trigger the "strobe" from.  Something like the following:

module controlOnFalling( in );
input in;
electrical in;
real dummyStore;

analog begin
  @(cross(V(in), -1) begin 
    dummyStore = V(in);
  end

endmodule

I have not tried the above code, so beware, it may have syntax or functional problems!

The cross event can be further controlled by supplying a time tolerance and an expression tolerance, here's a section from the documentation:

cross_function ::=
   	     cross (expr1 [ , direction [ , time_tol [ , expr_tol ] ] ] )
direction ::= 
   	     +1 | 0 | -1
time_tol ::=
   	     expr2
expr_tol ::=
   	     expr3
...
time_tol is a constant expression with a positive value, which is the largest
 time interval that you consider negligible. The default value is 1.0s, which is large
 enough that the tolerance is almost always satisfied.

The simulator will control the timestep and make calculations around the crossing event (in this case when the input signal falls to 0) and this would in effect give you a strobe or a timepoint at around the time that you are interested in.  If you wish to actually track the other signal that you are interested in, that could be an additional input to the module.

I hope this helps you, or at least gets you started.

Regards,

Lawrence.

 Hi Svilen,

You could create a Verilog-A or Verilog-AMS module that uses an @cross statement to monitor the crossing of a threshold - this would be the signal whose falling edge you want to trigger the "strobe" from.  Something like the following:

module controlOnFalling( in );
input in;
electrical in;
real dummyStore;

analog begin
  @(cross(V(in), -1) begin 
    dummyStore = V(in);
  end

endmodule

I have not tried the above code, so beware, it may have syntax or functional problems!

The cross event can be further controlled by supplying a time tolerance and an expression tolerance, here's a section from the documentation:

cross_function ::=
   	     cross (expr1 [ , direction [ , time_tol [ , expr_tol ] ] ] )
direction ::= 
   	     +1 | 0 | -1
time_tol ::=
   	     expr2
expr_tol ::=
   	     expr3
...
time_tol is a constant expression with a positive value, which is the largest
 time interval that you consider negligible. The default value is 1.0s, which is large
 enough that the tolerance is almost always satisfied.

The simulator will control the timestep and make calculations around the crossing event (in this case when the input signal falls to 0) and this would in effect give you a strobe or a timepoint at around the time that you are interested in.  If you wish to actually track the other signal that you are interested in, that could be an additional input to the module.

I hope this helps you, or at least gets you started.

Regards,

Lawrence.