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CORDIC rotator angle input units

KCMurphy
New Contributor I
250 Views

The documentation does not state what the input angle units are. 

From the IP GUI, it looks like they might be radians, even though 1.0000 = 2pi radians (or the signed equivalent) is a much better way to do a CORDIC, allowing a quick bit test for quadrant on angle inputs, and quick truncation of excess turns on arctan.

Are the units actually radians, where 3243F (b16) is 180 degrees?

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2 Replies
SyafieqS
Moderator
185 Views

Kevin,


Can you show me a snapshot might be good, are you referring to?


KCMurphy
New Contributor I
59 Views

When I find time, I will post something in detail.  But one thing that the Altera design misses:  One of the primary reasons people use a CORDIC is to get rid of the terribly difficult number "pi".  Particularly in binary logic.  It is actually not part of a CORDIC calculation unless someone makes it so.

 

A very clear description of CORDIC can be found here:  http://dspguru.com/dsp/faqs/cordic/

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