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Here it is. 
As I see it, pinout for P1 connector (where 7I76U is connected) is wrong for pins 7-13 (Sserial and spindle encoder)
 

koch777 wrote:

That one has all the right pinouts, but seem to be for older generation of 7I76 (Spartan FPGA?), not sure it will work for my 7I76EU (Efinix FPGA)

It does not work and might brick the card, well i am sure it will brick it, but being Mesa there might be ways to save it, so do not flash that.
Post the result of mesaflash readhmid here se we can have a look.

Hello everyone,

So, I have this configuration:

• Main board is Mesa 7I76EU
• 7I76U connected to main board expansion header P1
• 7I89 connected to main board expansion header P2

Main board's +5V is connected to P5; +24V field power - to TB1.
Actually, never mind, main 7I76EU is not a problem, it works, everything's detected, steppers are moving, spindle/spindle encoder are working, MPG is working.

Now, expansion 7I76U (on P1 header) is indicating communication failure (red led in the middle of te board). It doesn't show up in halconfig (should it?). Field power is there, cable power from main board is there.

For 7I89 I see all 8 encoders, but encoder inputs do not react to signals from encoders. None of the encoder input-a/input-b/rawcounts change despite the fact that physical signals from encoders are. Encoders are TTL and so 7I89 is jumpered accordingly.
+5V power to 7I89 is connected to its P1 and cable power from 7I76EU is activated as well (per 7I89 manual). Encoders are powered and working just fine (checked with oscilloscope).

Firmware I load is from mesa website: 7i76eu_7i76x1_7i88_7i89d.bin
It is somewhat strange as its 7i76eu_7i76x1_7i88_7i89d.pin file has stepgens 10/11 where 7I76U (P1) should have Sserial and it also has Sserial where should be MuxedQCount (spindle encoder). Basically I/O for DB25 pins 7-13 is all wrong for 7I76U.
Probably that's why my 7I76 doesn't work.

I'm afraid to load firmware from post www.forum.linuxcnc.org/27-driver-boards/...7i89-firmware#240149
That one has all the right pinouts, but seem to be for older generation of 7I76 (Spartan FPGA?), not sure it will work for my 7I76EU (Efinix FPGA)
It also has clock high frequency set at 200MHz, while 7i76eu_7i76x1_7i88_7i89d.pin shows 160MHz.

How can I get out of this predicaments?
Can anybody help?

For basic step/dir servos, a 7I76EU should do (by itself)

The 7I76EU has:

5 axis of step/dir outputs
32 digital inputs (5 to 24V)
16 digital outputs (5 to 24V)
Isolated analog 0..10V output for VFD spindle speed control
encoder input for spindle synchronized motion
2 parallel expansion ports (for additional step/dir or encoder channels)
1 serial expansion port (for more digital I/O

 

i asked ChatGPT about the boards, and it said I should use the 7i76e for axis control, the 7i85 for secondary axes, and the 7i89 for encoders.
Is this configuration correct?I also want to add some information about the servo motors I'm planning to buy.
I don't fully understand all the technical details, but if there is anything wrong or incompatible, I would really appreciate it if you could let me know.
Thank you!  

drive.google.com/file/d/1As0Eivp9ck6G0jz.../view?usp=drive_link