Method, system and computer program product for memory repair

A system, comprising:

• a memory testing device configured to perform at least one memory test on a memory block of a memory;
• and
• a processor coupled to the memory testing device,
• wherein the processor is configured to
• extract, from the at least one memory test, a location of at least one fail bit to be repaired in the memory block,
• obtain an available repair resource in the memory for repairing the memory block,
• determine whether the at least one fail bit is unrepairable according to
• the location of the at least one fail bit in the memory block, and
• the available repair resource, and
• in response to determining that the at least one fail bit is unrepairable,
• add the location of the at least one fail bit and the available repair resource to a database containing unrepairable bit patterns and corresponding available repair resources, and
• control the memory testing device to mark the memory block as unrepairable or to reject the memory.

A computer program product, comprising a non-transitory, computer-readable medium containing instructions therein which, when executed by a processor, cause the processor to

• extract, from at least one memory test on a memory block of a memory,
• a fail bit pattern of a plurality of fail bits to be repaired in the memory block, and
• a weak bit pattern of a plurality of weak bits in the memory block, and
• control repairing the memory based on
• a solution of a Constraint Optimization Problem (COP) containing a plurality of constraints and an objective function, the solution of the COP satisfying the plurality of constraints, optimizing the objective function, and indicating how an available repair resource in the memory is allocated in a repair of the plurality of fail bits and one or more weak bits among the plurality of weak bits,
• wherein the instructions, when executed by the processor, further cause the processor to
• assign a plurality of different weights to the plurality of weak bits, the different weights corresponding to different weakness levels of the plurality of weak bits, and
• formulate the objective function of the COP based on the plurality of weights and locations of the plurality of weak bits in the memory block.