Diagnosability for shared output registers

A method comprising:

• reading a first register that stores failing column status of memory arrays that are sharing the first register;
• reading a second register that stores a status bit associated with each of the memory arrays that are sharing the first register;
• reading a third register that stores an overflow status bit indicating whether more than one of the memory arrays that are sharing the first register have failing columns;
• determining whether the number of bits set in the first register is equal to one;
• responsive to determining that the number of bits set in the first register is equal to one, applying a repair action to a memory array corresponding to a bit that is set in the second register.

A system comprising:

• a processor set;
• memory arrays, each of the memory arrays comprising rows and columns of memory cells;
• a first register shared by the memory arrays, and operable to receive failing column status data from the memory arrays and store a failing column status bit corresponding to the failing column status data;
• a second register operable to receive failing memory array status data from the memory arrays, and set a failing memory array status bit corresponding to the failing memory array status data;
• and
• a third register coupled with the second register and operable to set and store an overflow status bit indicating whether more than one of the memory arrays are failing;
• the processor set configured to:
• read the first register that stores the failing column status of the memory arrays that are sharing the first register;
• read the second register that stores the failing memory array status bit;
• read the third register that stores the overflow status bit indicating whether more than one of the memory arrays that are sharing the first register have failing columns;
• determine whether the number of bits set in the first register is equal to one;
• responsive to determining that the number of bits set in the first register is equal to one, apply a repair action to a memory array corresponding to a bit that is set in the second register.