Nonvolatile semiconductor memory device capable of concurrently and reliably writing/erasing and reading memory cores

摘要

A semiconductor memory device, which allows concurrent execution of a write/erase operation and a read operation, is provided for each core with a core busy output circuit which has a function of, at the start, end, suspending or resuming of a write/erase operation, setting the sequence in which a command to write into/erase or read from a core, a core select signal indicating whether or not the core has been selected, and a busy signal indicating that the core is in the write/erase mode are set or reset so that multiple selection of a core in a write/erase operation and a core in a read operation does not occur.