Memory device having a write-back cache storing cache data and scrub data

Abstract

Systems, methods, and apparatus for a memory device that stores a scrub list in a cache used to reduce data traffic to and from a memory array. In one approach, the cache merges the scrub list with cache data. Data in the scrub list can be identified and distinguished from the cache data by adding a one-bit scrub flag to each data entry in the merged cache. In this merged approach, the cache data shares the same memory as the scrub list. Read data that has an error is saved temporarily in this merged cache until the correct value for the data is written back into the memory array.