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Altera_Forum
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15 years ago

The MSEL pins are powered by VCCINT

1)I am using EP3C25E144,it has MSEL[2..0],from tha datasheet see that "The MSEL pins are powered by VCCINT",but when I design the PCB ,i only saw that keep them '101' is Fast Active Serial Fast (AS F...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

If you want to be able change the MSEL setting easily, would it be ok to connect the MSEL pins via 10 kohm pulldowns to GND, and to use jumpers to VCCA? The 10 kohm pulldowns would be in parallel with the internal 5 kohm pulldowns (mentioned above by JacoL) just to make sure. The get a high level on the MSEL pin(s), close the jumper(s) to VCCA.

Where in the official documentation does it say that there are 5 kohm internal pulldowns?

I searched for MSEL in the data sheet, but I couldn't find it.