Hitachi, Ltd.

Shoji Iwamoto

Kinji Mori

Masayuki Orimo

Hiroshi Fujise

Masuyuki Takeuchi

Katsumi Kawano

Shigeki Hirasawa

Hitoshi Suzuki

Shigeo Tsujioka

Michio Asano

Yuko Teranishi

Masato Yamagishi

A data transmission method is provided for a multi-computer system which has a plurality of computers mutually connected via a transmission line. The plurality of computers are divided into groups, with an address assigned to each group. Transmission data of a sending computer is provided with a location where the address is assigned and a location where a content code indicating the data content is assigned. The sending computer transmits the data with either the address or content code assigned, and the computers other than the sending computer decide whether or not to receive the data according to either the address or the content code.

Data processing system and data transmission and processing method

A loosely coupled multiprocessor computer includes an input/output control unit for fetching both a program and data derived from an external input device and also for outputting processed data to an external output device; storage for storing therein both the program and data inputted from said input/output control unit; process unit for sequentially executing a processing operation of the data based upon the program stored in the storage; and, a transmission medium for coupling the process unit, input/output control unit and storage with each other. In the loosely coupled multiprocessor computer, a serial transmission medium is employed as the transmission medium. A transmission control unit for performing both a conversion process between data to be transmitted, flowing through the serial transmission medium and the processed data, and also a transmission/reception process of the data to be transmitted via the serial transmission medium, is provided with the input/output control unit, storage and process unit. A unit process unit for controlling the input/output control unit, storage, and transmission control unit is provided with the input/output control unit and storage with the transmission control unit.

Computer equipped with serial bus-connected plural processor units

A micro program control system for use in a data processing system includes a subsidiary control memory for storing the first micro instructions of respective micro programs, and a control memory for storing the second and the remaining micro instructions of the respective micro programs. The subsidinary control memory is coupled to a main memory in which macro instructions of a program for the data processing system are stored. The operation code of the macro instruction includes a code to address the first micro instruction in the subsidiary control memory, so that one of the first micro instructions can be accessed to supply into a control register when the macro instruction is read out from the main memory to an instruction register of the data processing system, whereby control signals for controlling the operation of the data processing system are delivered from the control register according to the contents of the first micro instruction. The second and necessary number of the remaining micro instructions in the control memory are fetched, in turn, into the control register according to the operation code of the macro instruction held in the instruction register and the contents of the preceding micro instruction in the control register, whereby a micro program corresponding to the macro instruction is performed.

Micro program control system

Growing community of inventors

Owariasahi, Japan

Shoji Iwamoto