Non-volatile semiconductor memory device with enhanced erase/write cycle endurance
First Claim
Patent Images
1. A semiconductor memory device being included in one chip, comprising:
- a volatile memory;
a non-volatile memory;
a volatile memory access unit operable to allow a device external to the chip to access the volatile memory;
a data save unit operable to save data from the volatile memory to the non-volatile memory; and
a power-supply unit operable to accumulate power therein, and supply the accumulated power to the data save unit for use in saving data, wherein the volatile memory, the non-volatile memory, the volatile memory access unit, the data save unit, and the power-supply unit are integrated into the chip.
1 Assignment
0 Petitions
Accused Products
Abstract
The power-supply unit, while directing externally supplied power to the control unit and the like, accumulates an amount of power that is required by the control unit to save data from the volatile memory to the non-volatile memory. When an external power supply has started, the control unit restores data of the non-volatile memory in the volatile memory; and when the external power supply has stopped, the control unit saves data from the volatile memory to the non-volatile memory.
60 Citations
7 Claims
-
1. A semiconductor memory device being included in one chip, comprising:
-
a volatile memory;
a non-volatile memory;
a volatile memory access unit operable to allow a device external to the chip to access the volatile memory;
a data save unit operable to save data from the volatile memory to the non-volatile memory; and
a power-supply unit operable to accumulate power therein, and supply the accumulated power to the data save unit for use in saving data, wherein the volatile memory, the non-volatile memory, the volatile memory access unit, the data save unit, and the power-supply unit are integrated into the chip. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification