A logic option that enables bus-hold circuitry during device operation. If this option is turned on, a pin will retain its last logic level when it is not driven, and will not go to a high impedance logic level. The Enable Bus-Hold Circuitry option should not be used at the same time as the Weak Pull-Up Resistor 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.