Semiconductor memory device having a serial access memory.

摘要

A semiconductor memory device includes a RAM (40) and a serial access memory (SAM) (41). The SAM includes an address counter which generates a slave address (SAD) and a master address (MAD). The slave address precedes the master address by half the period of a serial access strobe signal (SAS). A redundancy decision is made by comparing the slave address with a redundancy address. When the master address is supplied to a data register provided in the SAM, the decision result is available. That is, the SAM can be accessed immediately after the master address is supplied thereto.