Create a FPGA board for raspberry

No sense to use multiplexers for expand inputs, xc6slx9 in spi hostmot2 configuration support up to 85 gpio pins(for example: 4 port x 21 pin or 5 port x 17 pin).

Ok. Thats a interesting info.
My idea was to design the hardware very similar to the 7c80 board (IO0..IO36). There is already a bitfile for this and as a linuxcnc beginner I have fewer sources of error. So I can start more easy.
In future i want to have a bitfile for IO00..IO53. My machine doesn't has a encoder at this moment but it is planed.

But if I have to make a bitfile because of the ssr functionality then I can also remove the multiplexer.

Before loading the firmware - all pins in high impedance state.
After loading the firmware - all pins in gpio mode.
After loading the LinuxCNC, pins may be switching to the secondary function - it defined in hal/ini config string.
If in config string defined num_ssrs=0, all ssr pins in gpio mode.

Where i have to add num_ssrs=0. If I add it into .hal there is a error "unknown command".

First tests looks good!
 

Boaschti wrote:

Where i have to add num_ssrs=0. If I add it into .hal there is a error "unknown command".
 

You added it to config string?

Yes, I tried it also in the hm2_rpspi config string.
The message is here " invalid token in config string: "num_ssrs=0" "