Hitachi, Ltd.

Hitachi Vlsi Engineering Corp.

Michio Fujimoto

Masashi Wada

Akinori Matsuo

Masashi Watanabe

Yoshiharu Nagayama

Kazuo Naito

Means for changing-over address signals is provided in an address input portion, and the order of the signals to be input to an address decoder is changed according to external control signals. Alternatively, a reading output circuit is provided which reads data in bit unit different from that of the writing input circuit. Thus, data can be read and written even when the number of bits of data differs between in case of accessing a built-in memory of an LSI inside the LSI and in case of accessing it from outside the LSI.

Semiconductor integrated circuit device

A memory area within a semiconductor integrated circuit device is accessible through an address changeover circuit. External control signals instruct the memory device as to the addressing mode desired. Address signals originating externally are provided directly to the IC's address decoder circuits, while addresses originating internal to the IC are first shifted one or two bits to modify the address by a power of 2, then provided to the address decoder circuits. In this way, data of bit length N may be written to a memory array of bit length M, where M&gt;N.

Semiconductor device with change-over circuit to access a memory area

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Akishima, Japan

Michio Fujimoto