How to turn off all output port of MAXII during power-on.

As clearly documented in the device manual, MAX II I/O-pins are configured as input with weak pull-up during power up. Presumed the specification is correct, you'll see a positive pulse generated by the pull-up resistors during power-on reset. It's basically the same state that you'll observe for an unconfigured device.

If the assumption is right, there are two points to mention.

- There's absolutely no problem of collision involved with weak pull-up resistors.

- Weak pull-ups may be still a problem with active high output pins that are activating some function unintentionally. In this case you should either change the logic to active low or place external pull-down resistors overriding the weak pull-ups, e.g. 1k.

Regards,

Frank