A logic option that supports zero bus turnaround (ZBT) by increasing the propagation delay of the falling edge of the output enable signal. This option allows a device to quickly release control and slowly take control of a bus. Turning the Increase tzx Delay to Output Pin option on prevents bus contention between ZBT SRAM devices. This option is off by default.

This option is ignored if it is applied anything other than an output or bidirectional pin. This option is available for APEX^™ II, Mercury^™, Stratix^™, and Stratix^™ GX devices.