Hi all,
I m using cordic ip core in spartan 6 device,futher im getting the
correct outputs too, but facing problem in multiplying tat output to
some number( like pwm ontime).
For Example
Input: Pin(phase): 0001100100011110
Output: cos(theta):Xout: 0010110101000111
Output: Sin(theta):Yout: 0010110100111011
from above example,
Phase in = 45 degrees or 0.785 in radians in 2QN format.
Xout: 11591 in decimal format, 0.7071067 in 1QN format
Yout : 11579 in decimal format, 0.7071 in 1QN format
Now consider ,
I want to multiply 50 * Xout
= 50 * 11591 is what im able to do,but actually i need to do this
= 50 * 0.7071067
Please can any one help me out!!!!
Thanks in Advance
Actually, as long as you do not have a floating point unit instantiated, all you can do is integer arithmetics. So, you do 50 * 11591 and then right shift the result to avoid overflow, keeping the number of right shifts in memory.
Thank u ,it helped a lot.But how to handle wit floating points?,is der any keyword for it?.
look at opencores.org, guess you get a floating point unit from there.
Watch this topic
Disable multi-page viewPlease log in before posting. Registration is free and takes only a minute.
Existing account
Do you have a Google/GoogleMail account? No registration required!
Log in with Google account
Log in with Google account
No account? Register here.