1. A memory comprising: a memory block comprising data bits and additional bits; and logic configured to: receive a first and a second input; mask data in response to the first input; respond to a first command, wherein the response includes: writing the masked data into the data bits of the memory block, and writing “don't care” values into the additional bits of the memory block; and respond to a second command, wherein the response includes: writing the data into the data bits of the memory block, and writing the second input into the additional bits of the memory block.