I/O control system using buffer full/empty and zero words signals to control DMA read/write commands

摘要

In an input/output control system: a read/write operation for a control register (REG) under a program mode is achieved by hardware; the system is started or stopped under the control of firmware, and a data transfer in the system is achieved under the control of hardware. Therefore, a high speed data communication is realized, via the system, between a central control unit (CC) and an input/output unit (IO).