SEMICONDUCTOR MEMORY CARD, SEMICONDUCTOR MEMORY CONTROL APPARATUS, AND SEMICONDUCTOR MEMORY CONTROL METHOD

摘要

A host information memory is provided in a semiconductor memory card to hold data write commencement addresses and data sizes given from an access apparatus. An open physical area producing part decides, from the data write commencement addresses and data sizes, whether to erase ineffective blocks of the nonvolatile memory during data write and also decides the number of blocks to be erased. In a case of erasing, the erasing of ineffective blocks and the writing of data are simultaneously executed to different memory chips. In this way, the data erase processing can be optimized, and the access from the access apparatus to the semiconductor memory card can be preformed in a high speed.