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Altera_Forum
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8 years ago

MAX10 - Spikes at output pins upon startup

Upon starting up the 10M02SCU169 I see a spike at pins assigned as outputs that trying to drive low after configuration. I measured the pins of 1.8V and 3.3V bank and still see a spike on any pin ass...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Not sure if your voltage measurements are reliable, but seeing outputs pulled high by a weak pullup during power-on is normal operation of all Altera FPGA. Outputs required to keep low level during power-on must be equipped with a strong pull-down resistor, e.g. 500 ohms to 1k.

Better use active low signaling for critical signals.