sinusoidal wave & VHDL

[tiflis]

Good afternoon
someone knows to suggest me how I can generate a sinusoidal wave with
frequency = 1HZ in vhdl?
I have already generated a wave quadrant
How could I pass to the sinusoidal wave?

 

[Jim Lewis]

tiflis wrote:

Good afternoon
someone knows to suggest me how I can generate a sinusoidal wave with
frequency = 1HZ in vhdl?
I have already generated a wave quadrant
How could I pass to the sinusoidal wave?

For a testbench modeling, there are trig functions in

the package ieee.math_real. They expect angles in radians.
Trig functions in math_real:
Name [arguments] return Description
sin [real] real sine in radians
cos [real] real cosine in radians

There are also handy constants:
MATH_PI pi 3.14159265358979323846
MATH_2_PI 2*pi 6.28318530717958647693

There are more than this, but these are what I used.

Cheers,
Jim

 

[tiflis]

Jim Lewis ha scritto:

tiflis wrote:
Good afternoon
someone knows to suggest me how I can generate a sinusoidal wave with
frequency = 1HZ in vhdl?
I have already generated a wave quadrant
How could I pass to the sinusoidal wave?

For a testbench modeling, there are trig functions in
the package ieee.math_real. They expect angles in radians.
Trig functions in math_real:
Name [arguments] return Description
sin [real] real sine in radians
cos [real] real cosine in radians

There are also handy constants:
MATH_PI pi 3.14159265358979323846
MATH_2_PI 2*pi 6.28318530717958647693

There are more than this, but these are what I used.

Cheers,
Jim

ok thanks.
Meantime I have found this in Internet:

http://www.doulos.com/knowhow/vhdl_designers_guide/models/sine_wave_generator/

It could it are useful to me?

 

[Frank Buss]

tiflis wrote:

ok thanks.
Meantime I have found this in Internet:

http://www.doulos.com/knowhow/vhdl_designers_guide/models/sine_wave_generator/

It could it are useful to me?

Yes, this could be useful for you. But you have to think about the output:
If you feed 1 Hz to a DAC (e.g. a R2R network) and your lookup table is
small, then you need a filter at the output, which depends on the size of
the lookup table and your quality requirement for the output signal.

--
Frank Buss, fb@frank-buss.de
http://www.frank-buss.de, http://www.it4-systems.de