MEMORY CONTROLLER, STORAGE DEVICE, AND MEMORY CONTROL METHOD

摘要

According to one embodiment, a memory controller includes a decoding unit. The decoding unit calculates a syndrome weight in an LDPC code using a codeword read out from a non-volatile memory. The memory controller instructs the non-volatile memory to perform readout using first and second read-out voltages, and determines the first read-out voltage as the optimal read-out voltage in the case where a first syndrome weight based on a read-out result at the first read-out voltage is equal to or less than a second syndrome weight based on a read-out result at the second read-out voltage.

主权项

1. A memory controller for controlling a non-volatile memory storing a codeword coded by LDPC coding, the memory controller comprising:
a decoding unit configured to calculate a syndrome weight in an LDPC code using the codeword read out from the non-volatile memory; and a read control unit configured to instruct the non-volatile memory to read out the codewords using first and second read-out voltages, the read control unit determining the first read-out voltage as a read-out voltage used for readout from the non-volatile memory in a case where a first syndrome weight is equal to or less than a second syndrome weight, the first syndrome weight being calculated by the decoding unit using the codeword read out at the first read-out voltage, the second syndrome weight being calculated by the decoding unit using the codeword read out at the second read-out voltage.