MEMORY SYSTEM HAVING AN UNEQUAL NUMBER OF MEMORY DIE

摘要

A flash memory system having unequal number of memory die and method for operation is disclosed. The memory includes a plurality of flash memory die distributed unevenly among different control lines, such that there are an unequal number of die between control lines. A total physical storage capacity of the plurality of flash memory die is greater than a total logical capacity such that the memory system is over provisioned with physical storage capacity. A logical address splitter directs data received from a host system and associated with host logical block addresses such that each control line only receives data associated with predetermined host logical block address ranges and directs the data such that a ratio of physical capacity to logical capacity is equal among each of the control lines, regardless of the different number of die, and associated different physical capacity per control line.

主权项

1. A mass storage memory system, comprising:
an interface adapted to receive data from a host system; a plurality of control channels; a first group of flash memory die in communication with a first of the plurality of control channels; a second group of flash memory die in communication with a second of the plurality of control channels, wherein a number of die in the second group of flash memory die is greater than a number of die in the first group; wherein each of the plurality of control channels is associated with a unique subset of a host logical block address range; and wherein a ratio of a size of the unique subset of the host logical block address range associated with the first group to the number of die in the first group is equal to a ratio of a size of the unique subset of the host logical block address range associated with the second group to the number of die in the second group, and wherein a combined physical capacity of the die in the first group is less than a combined physical capacity of the die in the second group.