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Hello,
I made a custom version of the MESA Electronics 7c81 FPGA Card that I thought some of you might find interesting. 
I've attached images of the progress I've made so far. 





I haven't ordered the PCB yet, as I wanted to ask first, if any of you guys on here can find anything wrong with it. As I'm a student with limit budget I'd like to be a little more reassured that I'm not missing anything.
I used the  7c81 Schematics  found in this forum post and the schematics of the official  RPi CM5 IO-Board  to create my own schematics.





I have a few questions I haven't found a good answer for and I'd be happy to recieve constructive criticism on any part of the design.

• The SPI0 Bus of the RPi (SDA0, SCL0) is shared by the Serial Flash for the FPGA and one of the MIPI DSI/CSI-2 FPC connectors. Will this cause conflicts?
• I wasn't able to avoid routing traces under the FPGA, will this be likely to cause problems or will I be able to get away with it?
• Is it a good idea to ground pour the top and bottom signal layers of the 4 layer stackup, if I'm already using the two inner layers as ground planes?

Thank you in advance!
Niklas
 

This may be a setting about climb and conventional milling. Is there a "both" checkbox? (There is in Fusion)

It might be worth raising this as an issue ( github.com/LinuxCNC/linuxcnc/issues ) though it is almost a standard for Z0 to be top of travel (Fusion 360 CAM assumes this, for example, it scatters G53 G0 Z0 around the generated G-code) and I think that the other guis also go to Z=0 if you press the quill-up button.

It may be safer all round to reconfigure your Z with 0 at the top. This means that in machine coordinates Z is always negative, but that doesn't matter, you rarely if ever work in machine coordinates)

It should be possible, I assume you have read:
linuxcnc.org/docs/stable/html/man/man9/hostmot2.9.html#BiSS ?

HalloDa ich keine Antwort zurück bekommen habe versuche es nochmal.Die Frage war was muss man alles Einstellen in der HAL und INI.Habe den Vorschlag von Talla83 in der HAL und INI eingetragen, aber da steht ja schon jede menge darinnen.Muss das Deaktiviert werden?Hänge die beiden File an, vielleicht kann es einer ansehen.
Gruß Hans

I have some TAMAGAWA encoders model TS5661N132. It is an encoder with RS-485 serial communication. The question is: can this type of encoder be decoded with Mesa cards that support SSI or BiSS? If I'm not mistaken, this encoder is a Biss encoder.