Information transferring apparatus

摘要

An information transferring apparatus disposed between first and second information processing units comprises a first-in first-out stack, a first information line for transferring information from the first information processing unit to the first-in first-out stack, a second information line for transferring information from the first-in first-out stack to the second information processing unit, a third information line for transferring information from the second information processing unit to the first-in first-out stack, a fourth information line for transferring information from the first-in first-out stack to the first information processing unit, switching circuits for selectively deactivating the first to fourth information lines, and a command register for applying first and second control signals to the switching circuits, wherein the switching circuits operate responsive to the first control signal from the command register to deactivate the third and fourth information lines while holding active the first and second information lines, and operate responsive to the second control signal from the command register to deactivate the first and second information lines while holding active the third and fourth information lines. The command register may be replaced and its functions performed by either manual control or an external circuit.