Semiconductor memory device and access method and memory control system for same

Abstract

A semiconductor memory device using inexpensive block access semiconductor memories for storage media and able to be treated like a usual randomly accessible system memory, including a first semiconductor memory and a second semiconductor memory, wherein the second semiconductor memory is a cache of the first semiconductor memory, the first semiconductor memory is accessed via the second semiconductor memory, there are a first address region and a second address region on logical memory addresses accessed from the outside, at least part of the second semiconductor memory is mapped to the first address region, and a function of controlling data transfer between the first semiconductor memory and the second semiconductor memory by accessing the second address region is provided, and an access method and a memory control system of the same.