Hitachi, Ltd.

Hitachi Ulsi Engineering Corp.

Hitachi Microcomputer System, Ltd.

Other

Isamu Mochizuki

Kiyoshi Matsubara

Mitsuru Watabe

Yasushi Akao

Kouki Noguchi

Shumpei Kawasaki

Kazufumi Suzukawa

Shigeki Masumura

Kaoru Fukada

Eiji Sakakibara

Takashi Miyamoto

Hiroshi Takeda

Kazushige Ayukawa

Jun Sato

Hiroyuki Hamasaki

Kazuhiro Hirade

Makoto Takano

Kenichiro Omura

Yasuhiko Hoshi

Ryuichi Murashima

A semiconductor device is connected to a CPU, a memory and I/O devices to serve as a data transfer bridge for efficient data transfer between the memory and the I/O devices. A CPU interface and a plurality of I/O interfaces included in a bridge chip are connected through an internal bus to a memory interface included in the bridge chip. Each I/O interface has a read/write buffer and a DMAC. An arbiter included in the bridge chip determines a bus master for which data transfer is permitted in response to requests for data transfer from each of the CPU interface and the DMAC to the memory. Each of the I/O interfaces has a control function to skip part of areas in the memory when transferring data between the memory and the I/O interface.

Semiconductor device supporting integrated data transfer bridging between CPU memory and I/O device

A microcomputer that is easy to use and connected direct to such memories as dynamic and static RAM's and to other peripheral circuits. The microcomputer has strobe signal output terminals CASH*, CASL* and RAS* for direct connection to a dynamic RAM, and chip select signal output terminals CS0* through CS6* for outputting a chip select signal in parallel with the output from the strobe signal output terminals. The microcomputer further includes address output terminals for outputting a non-multiplexed or multiplexed address signal as needed, and data I/O terminals for selectively outputting the address signal to comply with a multiple-bus interface scheme.

Microcomputer and microcomputer system

Multiply connectable microprocessor and microprocessor system

Growing community of inventors

Tachikawa, Japan

Isamu Mochizuki