Semiconductor memory device e.g. card with SRAM and EEPROM - uses memory to store data attributes and data, buffer circuit and control memory banks

摘要

The memory device includes a common memory(1) for storing processed data. An attribute memory(2) for storing data attributes. A buffer circuit(3,4) connected between a bus of the common memory and a bus of the attribute memory. A control unit(27) is connected to the bus of the common memory and to the bus of the attribute memory to permit access to the common and attribute memories and to control the connection/isolation of the buffer circuits. ADVANTAGE - Protects integrity of stored data against misuse.