Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 2 / 2
Paul A. Clayton
User Rank
Author
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
Author
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
Author
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


Top Comments of the Week
Flash Poll
Radio
LATEST ARCHIVED BROADCAST
EE Times Senior Technical Editor Martin Rowe will interview EMC engineer Kenneth Wyatt.
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...