FPGA: Waves 6: Reconstruction Filter

RE: FPGA: Waves 6: Reconstruction Filter

shabaz — Wed, 06 Nov 2019 10:24:31 GMT

Hi Jon,

Fantastic stuff, it's really valuable having this resource for learning from your VHDL code.

Also, very cool seeing the filter and results!

RE: FPGA: Waves 6: Reconstruction Filter

jc2048 — Wed, 06 Nov 2019 00:01:07 GMT

Although I didn't say in the blog, what I've done here uses 158 slices in the FPGA. That's about 6% of those available.

This is what it looks like viewed with the floorplanner viewer which shows, in graphical form, how the placer has arranged the slices. Dark blue is all four slices in a block used, lighter shades are partial usage.

[View:/resized-image/__size/620x558/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-8360c0ca-b37b-471a-a761-bc9f1d1ebf04/1513.contentimage_5F00_205091.png:620:558]

This is how it looks in the 'physical view'. This shows a kind of representation of the routing of physical signals between the slices. It will roughly approximate to how the connections sit on the chip, though you can see it isn't entirely physically accurate.

[View:/resized-image/__size/620x505/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-8360c0ca-b37b-471a-a761-bc9f1d1ebf04/0027.contentimage_5F00_205092.png:620:505]

RE: FPGA: Waves 6: Reconstruction Filter

Jan Cumps — Tue, 05 Nov 2019 23:00:57 GMT

... because I only had a very limited range of chokes ...

I think this is a common thing.

Do you have the vhdl for this one available? I'm trying to ramp up my skills and would like to see how you implement the calculus.

It may not be portable 1-to-1 for the fpga I use (a Xilinx Spartan 6) because of IP blocks, but trying to port it may be a good boost for @self.

RE: FPGA: Waves 6: Reconstruction Filter

jw0752 — Tue, 05 Nov 2019 21:34:59 GMT

Hi Jon,

I find your explorations fascinating. I wish I had the knowledge and experience to say I truly understood everything but I don't. However with each blog you post I make some progress. I hope you continue to share your experiments. For me they are a treat and part of the foundation of this site.

John

RE: FPGA: Waves 6: Reconstruction Filter

three-phase — Tue, 05 Nov 2019 21:19:40 GMT

Another very interesting chapter in your FPGA series. No matter which direction you end up looking in next, I am sure I will find it interesting.

Kind regards.