Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

2007-07-31

2007-07-31

Nguyen, Hiep T. (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

Reexamination Certificate

active

10859542

ABSTRACT:
The logic format of a mask ROM (10) is composed of a user region (11) having a plurality of blocks, a spare region (12) having a plurality of blocks, and a table region (13) having a plurality of blocks. When the outside data is written in the mask ROM by the control of a MPU (24), if there is a defective block in the user region, the defective block is replaced by a spare block in the spare region. If the spare block is defective, it is replaced by another spare block. The replacement information (address, et.) is stored in a block in the table region, and if the block of the table region is defective, it is replaced by another block. Accordingly, since a defective block in the mask ROM (10) is replaced by another block, a defective mask ROM is relieved.

REFERENCES:
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patent: 5841699 (1998-11-01), Miyauchi
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patent: 6360293 (2002-03-01), Unno
patent: 2003/0051093 (2003-03-01), Takeuchi
patent: 2005/0289389 (2005-12-01), Yamagami et al.

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