Memory System

Abstract

The present invention provides a memory system which contributes to improvement in efficiency of a data process accompanying a memory access. A memory system has a rewritable nonvolatile memory, a buffer memory, and a controller. The controller controls, in response to an access request from an external apparatus, first data transfer between the controller and the external apparatus, second data transfer between the controller and the nonvolatile memory, and third data transfer between the controller and the buffer memory, controls transfer from the controller to the buffer memory in the third data transfer and transfer from the buffer memory to the controller in a time sharing manner, and enables the first data transfer or the second data transfer to be performed in parallel with the transfer carried out in the time sharing manner.

1 . A memory system comprising:
 a rewritable nonvolatile memory;   a buffer memory; and   a controller,   wherein said controller controls, in response to an access request from an external apparatus, first data transfer between said controller and said external apparatus, second data transfer between said controller and said nonvolatile memory, and third data transfer between said controller and said buffer memory, controls transfer from said controller to said buffer memory and transfer from said buffer memory to said controller in said third data transfer in a time sharing manner, and enables said first data transfer or said second data transfer to be performed in parallel with the transfer carried out in the time sharing manner.   
     
     
         2 - 22 . (canceled)