Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 2 / 2
Paul A. Clayton
User Rank
CEO
re: The basics of FPGA mathematics
Paul A. Clayton   8/7/2012 10:18:32 PM
NO RATINGS
I am guessing that your polynomial constant A is 131.29 (as in the original formula and in the scaled version in the table) not 133.29 (as in the table and the scaling factor calculation). (By the way, using a superscript for squaring would seem to be clearer than using x2. I am guessing that this was a conversion to html issue.)

Paul A. Clayton
User Rank
CEO
re: The basics of FPGA mathematics
Paul A. Clayton   8/7/2012 10:07:07 PM
NO RATINGS
Sorry, some of that was already mentioned--I should have read more carefully!

Paul A. Clayton
User Rank
CEO
re: The basics of FPGA mathematics
Paul A. Clayton   8/7/2012 9:58:10 PM
NO RATINGS
It would slightly simplify your equations for determining the required number of bits to simply use 'log'--for the quotient of two logs, the base does not matter. (I also thought the base was presented as a subscript rather than a superscript, but that may be a cultural difference.) It seems that a high result multiplier would be more desirable than a full precision (doubled precision result) or low result multiplier. I.e., one tends to care about the most significant bits. (Since a normalized FP multiply uses the high result, I would guess that FPGAs support such.) Also with multiplication (and division) shifts can be done before the operation or after the operation as long as the multiplier will not lose necessary precision. (When one operand is a constant, this can allow one to avoid shifting.)

<<   <   Page 2 / 2


Most Recent Comments
Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Engineering Investigations

Air Conditioner Falls From Window, Still Works
Engineering Investigations
Post a comment
It's autumn in New England. The leaves are turning to red, orange, and gold, my roses are in their second bloom, and it's time to remove the air conditioner from the window. On September ...

Max Maxfield

Feast Your Orbs on My Jiggly Exercise Machine
Max Maxfield
54 comments
Last weekend, I was chatting with my mother on the phone. She's all excited that I'm coming over to visit for a week in November. "I'll be seeing you in only seven weeks," she trilled ...

David Blaza

RadioShack: The End Is Nigh!
David Blaza
124 comments
I'm feeling a little nostalgic today as I read about what looks like the imminent demise of RadioShack, at least as we currently know it. An old ubiquitous cartoon image popped into my ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
47 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...