Create a Sine Wave Generator Using SystemVerilog

Awesome! Thanks, ...

tpylant — Fri, 17 Jul 2009 23:29:21 GMT

Awesome!

Thanks,

Tim

If we are at it alre ...

Anonymous — Fri, 17 Jul 2009 22:17:52 GMT

If we are at it already, here is the COS function, Root of 2, Natural base LOG, LOG 2 and LOG 10 (best to have all these and the SIN function together in the same file since they may call on each other):

// COS function

function real cos;

input x;

real x;

begin

cos = sin(x + `PI / 2.0);

end

endfunction

// ROOT of 2

function real rootof2;

input n;

integer n;

real power;

integer i;

begin

power = 0.82629586;

power = power / 10000000.0;

power = power + 1.0;

i = -23;

if (n >= 1)

begin

power = 2.0;

i = 0;

end

for (i=i; i< n; i=i+1)

begin

power = power * power;

end

rootof2 = power;

end

endfunction // rootof2

// does LOG_N of a number

function real log_n;

input x;

real x;

real re,log_2;

integer i;

begin

if (x <= 0.0)

begin

$display("log N illegal argument:",x);

$stop;

log_n = 0.0;

end

else

begin

if (x<1.0)

re = 1.0/x;

else

re = x;

log_2 = 0.0;

for (i=7; i>=-23; i=i-1)

begin

if (re > rootof2(i))

begin

re = re/rootof2(i);

log_2 = 2.0*log_2 + 1.0;

end

else

log_2 = log_2*2.0;

end

if (x < 1.0)

log_n = -log_2/12102203.16;

else

log_n = log_2/12102203.16;

end

endfunction // log_n

// does LOG2 of a number - using LOG_N

function real log2;

input x;

real x;

begin

log2 = log_n(x)/log_n(2.0);

end

endfunction // log2

// does LOG10 of a number - using LOG_N

function real log10;

input x;

real x;

begin

log10 = log_n(x)/log_n(10.0);

end

endfunction // log10

That works great! I ...

tpylant — Fri, 17 Jul 2009 01:03:28 GMT

That works great! I just put your code in my package in place of the "import...sin" and it worked like a champ.

Thanks for sharing,

Tim

Hi Tim, I had this s ...

Anonymous — Thu, 16 Jul 2009 23:56:42 GMT

Hi Tim, I had this same problem before and used something else I found:

A function that has a sin approximation, input is real, and you invoke the function at the desired clock rate and supplying the desired input, here is the code:

`define PI 3.14159265

function real sin;

input x;

real x;

real x1,y,y2,y3,y5,y7,sum,sign;

begin

sign = 1.0;

x1 = x;

if (x1<0)

begin

x1 = -x1;

sign = -1.0;

end

while (x1 > `PI/2.0)

begin

x1 = x1 - `PI;

sign = -1.0*sign;

end

y = x1*2/`PI;

y2 = y*y;

y3 = y*y2;

y5 = y3*y2;

y7 = y5*y2;

sum = 1.570794*y - 0.645962*y3 +

0.079692*y5 - 0.004681712*y7;

sin = sign*sum;

end

endfunction // sin