Wreal is a double precision datatype (like electrical nets) but is simulated in the digital domain (event driven).
There are a lot of possibilities to utilize this to speed up simulations.
Check the BMAS papers from last year for "event driven modeling".

Regards,

Stefan

Its great.. you can send REAL number signals around without invoking an analog solver.. BUT there are limitations..
Wreals support only 1 number on a wire -- and it can only go one way..
-- give me an inch and I want a mile..
-- but with that limitation you can quite accurately model an ADC or dac without the analog solver.. or there is the PLL model stephan talks about.
-- I've even modeled an RF receiver with wreals.. and simulated a couple of frames of TV data in minutes.. -- from antenna thru the ADC after the filters.. (I left the supply and bias lines as electrical - because of the significant benefit of being able to pass voltage one way and current the other.. (thru the normal analog solver) and it was less modeling work, with NO speed up (they are DC networks afterall!!)

`timescale 1ns/1ns
module analog_driver (out_p, out_m);
output out_p, out_m;
wreal out_p, out_m;
parameter real vcm = 0.5;
parameter real vamp = 0.5;
parameter real Fout = 10M;
parmeter integer PtsPerPer = 10;
real out_val = 0;
real Tupdate= 1/Fout/1n; //(scale up to the timescale)
assign out_p = vcm + out_val;
assign out_m = vcm -out_val;
always begin
 Tupdate = 1/Fout/1n;
 out_val = vamp*sin(`M_PI *2 * Fout * $realtime *1n);
 #(Tupdate);
end
endmodule
--

no analog == VERY fast!!
jbd