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This is probably not an explanation why the MAX II smoked, but I just want to point out one thing:
By default the C4GX Dev Kit is configured to use 1.8V as the I/O voltage for banks 5 & 6. And many of the HSMC pins are connected to banks 5 & 6 ...
In order to change to IO voltage 2.5V for those banks, you should shunt the jumper J3. See the table 2-45 in the G4GX DevKit reference manual.
We were lucky and our board survived but without this jumper our HSMC board did not work correctly ...
Regards,
Jari
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Shunt the jumper J3 means to connect it?
I thought to make it to 2.5V IO is to assign at pin planner so that it is 2.5V LVCMOS? Because it seems that shunt the jumper J3 is for power management kind of stuff?
and, you mentioned without the jumper your HSMC board did not work correctly. The HSMC board you mean is the host Altera board or the daughter card you connecting to? However, you didnt burn the board even though you give it 2.5V while it is configured for 1.8V right?
Well, I still have no progress on my finding. Because it still seems to me that there is no direct connection between HSMC and MAX II. So no matter HSMC is supporting 1.8V, 2.5V or 3.3V, it still seems to me to not possible to damage the MAXII CPLD.
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