A logic option that enables the weak pull-up resistor when the device is operating in user mode. This option pulls a high-impedance bus signal to VCC. The Weak Pull-Up Resistor option should not be used at the same time as the Enable Bus-Hold Circuitry option.

This option is ignored if it is applied to anything other than a pin. This option is available for APEX^™ II, Cyclone^™, MAX^® 7000B, Mercury^™, Stratix^™, and Stratix^™ GX devices.