MEMORY CONTROLLER, NONVOLATILE MEMORY DEVICE, NONVOLATILE MEMORY SYSTEM, AND MEMORY CONTROL METHOD

摘要

A program download unit (108) downloads, in accordance with a selecting instruction of a program selecting unit (105), a program to be executed by a memory interface unit (103), selectively from a nonvolatile memory (140). The download of the program is performed in parallel with the operation in a control unit (102), so that a time overhead can be made unnecessary for the download. In accordance with a command from a host (160), the necessary program is selected so that the unnecessary program need not be downloaded every time, thereby to realize a power economy. As a result, the operations of the interface unit on the nonvolatile memory can be made programmable thereby to correspond to a plurality of kinds of nonvolatile memories, to reduce the capacity of a program storing RAM and to realize a high-speed access and the power economy.