buffers for driving interconnection conductors on programmable logic devices are shared between two types of uses , i . e ., to drive static programmable connections to interconnection conductors , and to drive dynamically controllable connections to other interconnection conductors . the dynamically controllable connections are preferably tri - statable . signals for effectuating the dynamic control are preferably generated on the programmable logic device near the tri - state - type connections . for example , a nearby logic module may provide the dynamic control signal . this reduces the extent of routing for , and consequent delay of , the dynamic control signal .