| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem that cost reduction in a system requiring both flash memories and reduction in a mounting area in a portable system are obstructed because a code flash memory for storing programs, etc., and a data flash memory for storing image data, etc., respectively have different request performance for reading/writing or the like, so that they may be configured by different chips in the conventional practice. <P>SOLUTION: This nonvolatile semiconductor storage device is provided with a first memory block 104 having a first writing level and a first reading means, a second memory block 102 having a second writing level different from the first writing level and a second reading means with a different system from the first reading means and formed on the same memory block as that of the first memory block, and a data outputing means 128 for selecting either the first reading means or the second reading means and outputing read data to the outside. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
