The MSEL pins in Stratix II devices are internally pulled down via 5k ohm resistance. Pulling an MSEL pin high externally (to VCCPD = 3.3V) via a 10k ohm resistor will present an indeterminate value of ~1.1V to the MSEL pin. This could prevent the device from configuring. Hence you should tie MSEL pins directly to VCCPD (3.3V) or GND. Alternatively you can use a zero ohm resistor to tie them to VCCPD or GND.
Article ID: 000079993 Content Type: Troubleshooting Last Reviewed: 08/13/2012
Can I pull up the MSEL pins with an external 10k ohm resistor on my Stratix® II device?
BUILT IN - ARTICLE INTRO SECOND COMPONENT