android11
Newbie level 1
Hey,
I`d like to programm a 8bit DAC with thermometercoded input signal in VerilogA.
Because there are quite a lot input bits to consider (255), I wanted to use the generate comand.
In my simulation with spectre it seams that I never reaching the loop.
What am I doing wrong there?
I`d like to programm a 8bit DAC with thermometercoded input signal in VerilogA.
Because there are quite a lot input bits to consider (255), I wanted to use the generate comand.
In my simulation with spectre it seams that I never reaching the loop.
What am I doing wrong there?
PHP:
`include "discipline.h"
`include "constants.h"
`define Nin 255
module DAC8bit(Vout,in, VDD, VSS, Vclk);
output Vout;
input [1:`Nin] in;
input VDD;
input VSS;
input Vclk;
electrical [1:`Nin] in;
electrical Vout, VDD, VSS;
electrical Vclk;
parameter real trise = 0 from [0:inf);
parameter real tfall = 0 from [0:inf);
parameter real vrefp =2;
parameter real vrefm = -2;
parameter real vtrans_clk = 0;
real aout;
real LSB;
real bit [1:`Nin];
integer ii;
analog begin
@(initial_step) begin
LSB = (vrefp-vrefm) / `Nin;
aout = vrefm;
end
@(cross(V(Vclk)-vtrans_clk,1)) begin
generate i (1,`Nin) begin
if (V(in[i])>vtrans_clk) begin
bit[i] = LSB;
end else begin
bit[i] = 0;
end
end
for (ii=1; ii<=`Nin; ii=ii+1)
aout = vrefm+bit[ii];
end
V(Vout) <+ transition( aout, 0, trise, tfall );
end
endmodule
`undef Nin