in a computer system having multiple components , a bidirectional scheme which allows bidirectional data communications between components over a single wire without using termination resistors by placing two drivers from two corresponding processor cores on the same wire , and allowing simultaneous data transfer in two directions . this doubles the effective bandwidth per pin without requiring a modification to the clocking scheme of the system . the driver is impedance matched to the line , and used as the termination for the driver on the opposite end of the wire . this reduces the termination power , since no power is consumed when both drivers are in the same state . the bidirectional flow of data creates a ternary encoding , with a relatively simple decoding possible .