Semiconductor memory for increasing the number of half good memories by selecting and using good memory blocks
AssigneeFujitsu Limited
InventorsShinya Fujioka, Atsushi Hatakeyama, Hirohiko Mochizuki
Life of this patent
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Abstract
A semiconductor memory has a plurality of memory arrays, and a plurality of selection circuits. Each of the memory arrays has a plurality of memory blocks. The selection circuits is provided to the memory arrays and is used to independently disable a defective memory block and select a normal memory block in the memory array. Therefore, the semiconductor memory enables to increase the number of partial good memories (half good memories: half capacity memory), and to increase a product yield.
Claims17
A semiconductor memory selectively enabled for operation as a complete operative memory or a partial operative memory, comprising:
- a plurality of memory arrays, each memory array comprising a plurality of memory blocks;
- and
- a plurality of selection circuits respectively associated with said plurality of memory arrays, selectively and independently disabling a defective memory block and selecting a normal memory block of a memory array for enabling operation thereof as a partial operative memory.
A semiconductor memory selectively enabled for operation as a complete operative memory or a half operative memory, comprising:
- a plurality of memory arrays, each memory array comprising a first memory block and a second memory block;
- and
- a plurality of selection circuits respectively associated with said plurality of memory arrays, selectively and independently disabling said first memory block and selecting said second memory block, when said first memory block is defective and said second memory block is normal.
Dependencies are inferred from the claim text.