Abstract: In electronic systems, signaling problems frequently occur when a device is driving a signal on a line to an incorrect level at a particular point in time. When production schedules do not permit fixing the defects in the errant device, programmable logic has been employed to work around the problems caused by the defective device. Higher device speeds and increasingly complex bus protocols have made the technique of singly using programmable logic, more difficult to implement. The addition of bidirectional switches integrated with and controlled by programmable logic in a monolithic integrated circuit allows the programmable logic device to respond more quickly while at the same time consuming less printed circuit board space. Additionally, the invention provides for termination of the isolated device and/or signal line stubs.