Static information storage and retrieval – Read/write circuit – Bad bit
Patent
1993-08-10
1995-03-28
Yoo, Do Hyun
Static information storage and retrieval
Read/write circuit
Bad bit
36523003, 36523006, G11C 700, G11C 2900
Patent
active
054023769
ABSTRACT:
In a semiconductor memory, switch circuits are provided so as to inhibit voltage and signal supplies to each of the normal memory blocks when so required. On the other hand, a ROM is provided on the chip so as to store the address of a defective memory block which consumes an excessively large stand-by current when the semiconductor memory is in the stand-by mode. The switch circuits are controlled by the output of the ROM so as to inhibit the voltage and signal supply to the defective memory block. Then, a spare memory block which is substituted for the defective normal memory block receives the voltage and signal supply.
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Aoki Masakazu
Etoh Jun
Horiguchi Masashi
Itoh Kiyoo
Nakagome Yoshinobu
Hitachi , Ltd.
Hitachi VLSI Engineering Corp.
Yoo Do Hyun
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