An input-output controller for data transfer entreun central computer and input-output unit

摘要

HIGH PERFORMANCE I/O CONTROLLER FOR TRANSFERRING DATA BETWEEN A HOST PROCESSOR AND MULTIPLE I/O UNITS An I/O controller for transferring data between a host processor and an I/O unit is disclosed comprising: a random access storage unit located in the I/O controller for storing data; first selectively operable data transfer circuitry for providing a data transfer path between the host processor and the controller storage unit; second selectively operable data transfer circuitry for providing a data transfer path between the controller storage unit and the I/O unit; first storage accessing circuitry for supplying addresses to the controller storage unit and selection signals to the second data transfer circuitry for enabling the transfer of data between the controller storage unit and the I/O unit; second storage accessing circuitry for supplying host processor main storage addresses to the host processor, controller storage addresses to the controller storage unit and selection signals to the first data transfer circuitry for enabling the transfer of data between the host processor main storage unit and the controller storage unit in a first data transfer mode; third storage accessing circuitry responsive to addresses received from the host processor for supplying addresses to the controller storage unit and selection signals to the first data transfer circuitry for enabling the transfer of data between the host processor and the controller storage unit in a second data transfer mode; and interleaving control circuitry for enabling the second mode data transfers to be interleaved with the first mode data transfers.