MEMORY SYSTEM, MEMORY SYSTEM CONTROL METHOD, AND DRIVE RECORDER APPARATUS
First Claim
Patent Images
1. A memory system comprising:
- a non-volatile memory including a plurality of memory cells which are controlled to be at any one of 2m (m is a positive integer) kinds of threshold levels and thereby can retain m-bit data;
a duplicating-converting section configured to duplicate input data so that m-bit data to be retained in one of the memory cells are assigned to two threshold levels different from each other; and
a controller configured to write respective pieces of the input data duplicated by the duplicating-converting section, to memory areas different from each other in the non-volatile memory.
1 Assignment
0 Petitions
Accused Products
Abstract
A memory system includes a NAND-type flash memory which includes a plurality of memory cells and can store one-bit, two-bit or more data in one memory cell, and a duplicating-converting circuit configured to duplicate input data by assigning the input data to a predetermined threshold level and another threshold level different from the predetermined threshold level. Moreover, the memory system includes a controller configured to control to store the data duplicated by the duplicating-converting circuit, in the NAND-type flash memory.
-
Citations
20 Claims
-
1. A memory system comprising:
-
a non-volatile memory including a plurality of memory cells which are controlled to be at any one of 2m (m is a positive integer) kinds of threshold levels and thereby can retain m-bit data; a duplicating-converting section configured to duplicate input data so that m-bit data to be retained in one of the memory cells are assigned to two threshold levels different from each other; and a controller configured to write respective pieces of the input data duplicated by the duplicating-converting section, to memory areas different from each other in the non-volatile memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A memory system control method including a non-volatile memory including a plurality of memory cells which are controlled to be at any one of 2m (m is a positive integer) kinds of threshold levels and thereby can retain m-bit data;
- the memory system control method comprising;
duplicating input data so that m-bit data to be retained in one of the memory cells are assigned to two threshold levels different from each other; and writing respective pieces of the duplicated input data to memory areas different from each other in the non-volatile memory. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
- the memory system control method comprising;
-
20. A drive recorder apparatus, comprising:
-
a moving image compressing section configured to compress input data from an image pickup apparatus, according to a predetermined scheme; a volatile memory including a memory capacity capable of retaining the input data compressed by the moving image compressing section; a shock sensor configured to output a control signal which is a trigger for duplicated storage when sensing an impact; a non-volatile memory including a plurality of memory cells which are controlled to be at any one of 2m (m is a positive integer) kinds of threshold levels and thereby can retain m-bit data; a duplicating-converting section configured to duplicate the input data retained in the volatile memory so that m-bit data to be retained in one of the memory cells are assigned to two threshold levels different from each other; and a controller configured to, when the control signal is outputted from the shock sensor, write respective pieces of the input data duplicated by the duplicating-converting section, to memory areas different from each other in the non-volatile memory.
-
Specification