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Altera_Forum's avatar
Altera_Forum
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15 years ago

Help! --“msel” floating in cyclone ii design..

I know msel0 and msel1 should be connected to VCC or GND. but I forgot to connect them. when I debug the PCB,the cyclone ii device become very hot quickly! :( can it because of the "msel pro...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

The Cyclone II datasheet is very clear about the need for connecting MSEL pins. In so far, a service request surely won't get the answer ist's O.K. It's different e.g. with Cyclone III, that has pull-down resistors for MSEL.

I would also rather expect I/O shorts to cause excessive power dissipation. But I can't exclude, that the problem may be caused by unconnected MSEL.