Metadata management for a cache

An apparatus, comprising:

• a volatile memory configured to operate as a cache for a non-volatile memory;
• and
• an interface controller coupled with the volatile memory and the non-volatile memory, the interface controller operable to cause the apparatus to:
• receive, from a host device, an activate command;
• communicate storage information for a row of the volatile memory from an array to a register based at least in part on the activate command being associated with the row;
• receive, from the host device, a write command associated with the row of the volatile memory;
• and
• determine, based at least in part on the storage information in the register, whether the row of the volatile memory stores data from an address, of the non-volatile memory, associated with the write command.

An apparatus, comprising:

• a volatile memory configured to operate as a cache for a non-volatile memory;
• and
• an interface controller coupled with the volatile memory and the non-volatile memory, the interface controller operable to cause the apparatus to:
• receive, from a host device, an activate command associated with a row of the volatile memory;
• communicate storage information for the row of the volatile memory from a first array to a first register based at least in part on the activate command;
• receive, from the host device, an access command associated with the row of the volatile memory;
• and
• communicate, based at least in part on the access command and the storage information in the first register, validity information for the row from a second array to the first register or dirty information for the row from the second array to a second register.