A while back my student developed a work to produce non-linear functions
for FPGA through various linear approximations and lookups with the goal
to minimize hw resources while maintaining good and quantifiable
accuracy. It included arctan among others:
S. M. H. Ho and H. K. So, "NnCore: A parameterized non-linear function
generator for machine learning applications in FPGAs," /2017
International Conference on Field Programmable Technology (ICFPT)/,
2017, pp. 160-167, doi: 10.1109/FPT.2017.8280134.
Code:
https://bitbucket.org/hku-casr/nncore/src/master/
It's a bit dated but may be worth taking a look.
Hope it helps.
--Hayden
Bob Stricklin wrote on 13/12/2021 11:54 PM:
Consider making a lookup table. If your accuracy requirements and space will
allow it. This is the way things use to be done before calculators and
computers and it will work in a lot of cases.
Bob Stricklin
On Dec 13, 2021, at 6:55 AM, baldwin <[email protected]> wrote:
Hi Guys,
Quick question; I'm just wondering what is the best way to calculate arctan on
the FPGA? I am currently using the Xilinx CORDIC block to take I and Q and use
them to calculate phase, but have found this to give unreliable data. While it
sometimes gives out the correct phase value, it often just gives completely
nonsensical results. Just wondering if anybody else has ever had similar issues.
All the best,
Eoin.
--
You received this message because you are subscribed to the Google Groups
"[email protected]" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/6a1e1ff7f781ec963db9c826b973adec%40cp.dias.ie.
--
/**********************************************************
* Hayden Kwok-Hay So
* Associate Professor
* Department of Electrical and Electronic Engineering
* Program Co-director, Computer Engineering
* Co-director, Joint Lab on Future Cities (JLFC <https://www.jlfc.hku.hk>)
* PI, Computer Architecture and System Research Lab (CASR
<https://casr.eee.hku.hk>)
* The University of Hong Kong
*http://www.eee.hku.hk/~hso
**********************************************************/
--
You received this message because you are subscribed to the Google Groups
"[email protected]" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/697beb2c-a22c-7085-664e-c6d2603aa53a%40eee.hku.hk.
