Scheduling of housekeeping operations in flash memory systems

Simultaneously erasable flash EEPROM systems, such as re-programmable non-volatile memory system having grouped the memory cells in the block of cells is operable to perform memory system housing-keeping operation of the foreground during the execution of a host command, the housekeeping operations are independent of the host command. One or more of the execution of all housekeeping operations and the host command is performed in the set time donghan cost of the specific command. One is the command for writing the received data in the memory. One of the housekeeping operation is to level the consumption of individual blocks that are also stored by the repeated erasing and programming.