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`include "constants.h"
// $Date: 1997/08/28 05:54:36 $
// $Revision: 1.1 $
//
//
//--------------------
// dac_8bit_ideal
//
// - 8 bit digital analog converter
//
// vd0..vd7: data inputs [V,A]
// vout: [V,A]
//
// INSTANCE parameters
// vref = reference voltage that conversion is with respect to [V]
// vtrans = transition voltage between logic high and low [V]
// tdel,trise,tfall = {usual} [s]
//
// MODEL parameters
// {none}
module dac_8bit_ideal (vd7, vd6, vd5, vd4, vd3, vd2, vd1, vd0, vout);
electrical vd7, vd6, vd5, vd4, vd3, vd2, vd1, vd0, vout;
parameter real vref = 1 from [0:inf);
parameter real trise = 0 from [0:inf);
parameter real tfall = 0 from [0:inf);
parameter real tdel = 0 from [0:inf);
parameter real vtrans = 2.5;
real out_scaled; // output scaled as fraction of 256
analog begin
out_scaled = 0;
out_scaled = out_scaled + ((V(vd7) > vtrans) ? 128 : 0);
out_scaled = out_scaled + ((V(vd6) > vtrans) ? 64 : 0);
out_scaled = out_scaled + ((V(vd5) > vtrans) ? 32 : 0);
out_scaled = out_scaled + ((V(vd4) > vtrans) ? 16 : 0);
out_scaled = out_scaled + ((V(vd3) > vtrans) ? 8 : 0);
out_scaled = out_scaled + ((V(vd2) > vtrans) ? 4 : 0);
out_scaled = out_scaled + ((V(vd1) > vtrans) ? 2 : 0);
out_scaled = out_scaled + ((V(vd0) > vtrans) ? 1 : 0);
V(vout) <+ transition( vref*out_scaled/256, tdel, trise, tfall );
end
endmodule
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