Semiconductor memory system with the function of the replacement

Details Semiconductor memory system with the function of the replacement Semiconductor memory system with the function of the replacement

1994-09-06

1995-11-21

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Bad bit

365201, 36523003, 371 102, G11C 700, G11C 2900

Patent

active

054693900

ABSTRACT:
In a semiconductor memory system including a plurality of memory chips, a spare memory is shared among the memory chips. For such a purpose, a common redundant circuit and an external terminal capable of accessing to a spare memory are added to a semiconductor memory system, and a first region for storing a defect address in each memory of the semiconductor memory system and a second region for storing a defect address of the system of the object having the same structure as the first region are provided in the redundant circuit. With this, even when the defect of a normal memory of the semiconductor memory system can not be replaced with the spare memory of the system itself, replacement is made possible with other system having the same structure. Accordingly, the yield of the semiconductor memory system can be increased, and the reliability is also increased.

REFERENCES:
patent: 5293348 (1994-03-01), Abe
patent: 5315552 (1994-05-01), Yoneda
patent: 5357473 (1994-10-01), Mizuno

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