Schematics for 7c81

Is there any mesa guys willing to share the schematics for the 7c81 ? Pretty Pretty PLEASE

I want to buy three but the lady cam told me they will have to redesign because of part shortage 3-6 months. I have a few Spartan 6 LX9 and want to try build one for my production machine.

Its a bit of a nuisance for me to pdf-ize the 7C81 schematics with all the
mixed sheet sizes, but you can get most of the wiring from the 7c81.ucf file
in the source.

Thanks for the reply. That helped a bit what IC's do you use to interface with RS-422/RS-485 and FGPA ?

The RS-485 chips are SP491 or equivalent
I think there's a 74LCX04 use to convert
the RX out from the SP491s to 3.3V
and invert the DE signal (though this inversion can also be
done in the firmware)

The port bus switches for 5V compatibility are 74CBT16211Cs

How much to post schematics ? I have been researching the whole day and it will take me some time to design this not to mention to edit configs. I found schematics for 7i92 are the 7c81 and 7i92 close to design ? Can I replace the PI5C16211 with SN74HCT245PWR ? Do use Raspberry 4B for RS422/485 or FGPA ?

I would like 2 x Parallel port and 2 x Serial Port/Modbus ports output from the FGPA Cards

Schematics for the 2 x Parallel Breakout board designed in EasyEDA if anyone is interested

 

 

 

It seems the real time latency is a problem for me when using 2 x parallel port on PC without FGPA

Ill try an get to this in the next week or so

Thanks Dude ! Once I have the schematics i will try and design PCB and use items that are available.

Please don't forget about the Schematics