Hitachi Maxell, Limited

Hitachi, Ltd.

Mikio Matoba

Shigeru Sakairi

Ken Sugawara

Katsutaka Kimura

Toshio Sasaki

Katsuhiro Shimohigashi

Katsujiro Nakamura

A memory cartridge having a plurality of dynamic memory units includes an access conversion circuit which converts a static access signal into its inverted signal and an access control circuit which controllably switches between a signal for refreshing each dynamic unit and a signal for external access. The memory cartridge also includes a power switching circuit which switches power from an internal power supply to an external power supply when the memory cartridge is mounted to an external device.

Semiconductor apparatus with two activating modes of different number of

Memory cartridge and its memory control method

A semiconductor file memory has a semiconductor memory connected to an information processor and operated to store data transferred from the information processor and read out stored data, the file memory comprising a serial/parallel conversion circuit which receives, in a serial manner, data to be stored in the semiconductor memory and converts the data line parallel data, a parallel/serial conversion circuit which receives data read out of the semiconductor memory and converts the data into serial data, and an address data holding circuit which holds address data transferred from the information processor, the serial data transferred from the information processor being converted into parallel data by the serial/parallel conversion circuit and the converted data stored in the semiconductor memory in accordance with addresse data held in the address data holding circuit, and parallel data stored in the semiconductor memory is read out in accordance with address data held in the address data holding circuit, the readout data being converted into serial data by the parallel/serial conversion circuit and the converted data is being transferred to the information processor.

Semiconductor serial/parallel-parallel/serial file memory and storage

A semiconductor file memory, intended for use as an external memory of an information processor such as an arithmetic processor, including an interface for transacting data with the information processor, a plurality of memory units each including semiconductor memory devices mounted on a substrate and having identical terminal assignments in connection commonly to a bus of the interface through a connector, a control circuit unit having identical terminal assignments for the connectors of the memory units and operating to control the memory units by taking the place of at least one of the memory units, and a selection circuit for selecting a memory unit or control circuit unit out of the memory units and the control unit which has taken the place of the memory unit in response to signal from the interface.

Semiconductor file memory

Growing community of inventors

Ibaraki, Japan

Mikio Matoba