ZERO READ ON TRIMMED BLOCKS IN A NON-VOLATILE MEMORY SYSTEM

摘要

A system and method is disclosed for providing zero data in response to a host data read directed to a logical address that is not associated with valid data. The system may be a non-volatile memory system including non-volatile memory and a controller configured to determine whether a logical address in a read command is associated with valid data. The controller may be configured to generate, store in non-volatile memory and retrieve from that non-volatile memory a zero data entry. The controller may also be configured to include any associated encryption key or logical address in the generation of the zero data in order to satisfy data path protection and/or encryption requirements for the non-volatile memory system. Storage and retrieval of the zero data may be via the non-volatile memory array or only the data latches of the non-volatile memory.

主权项

1. A method for providing expected zero data in a non-volatile memory system, the method comprising:
receiving a read command from a host identifying a logical address; determining whether valid data is present at the logical address; in response to determining that no valid data is present at the logical address:
determining whether a zero data entry exists for the logical address;in response to determining that no zero data entry exists:
automatically generating a zero data entry for the logical address;storing the zero data entry in non-volatile memory of the non-volatile memory system;retrieving the zero data entry from the non-volatile memory; andtransmitting the retrieved zero data entry to the host in response to the read command.