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I'm not sure about the CIV board but the CIII started board has 2.5V IO with no protection on the inputs so I'd wouldn't expect the inputs to reliably work / survive with 3.3V.
If the Max device can see the HSMC pins it might be that it's got 2.5V IO and can't withstand 3.3V.
Nial.
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Last time before I used CIVGX board, I tested and run the same design on CIII Starter board too. Through the HSMC, I give 3.3V input signal and it is still functioning well. So I have no idea why it is not functioning in CIVGX.
Also, I find the MAXII device does not connect to HSMC pins. Attached the MAXII block diagram from the C4GX reference manual.
Pls advice if I understand the block diagram wrongly.
Thank you.
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