Semiconductor disk device with a constant data-writing time peri

Details Semiconductor disk device with a constant data-writing time peri Semiconductor disk device with a constant data-writing time peri

1995-04-27

1997-04-08

Nelms, David C.

Static information storage and retrieval

Floating gate

Particular biasing

36518533, 3651852, 36518511, 395430, G11C 1134

Patent

active

056194528

ABSTRACT:
A semiconductor disk device provided with a flash memory capable of performing a stable block erasing operation in a short time period wherein the variations in the erasing times from block to block are minimized. The semiconductor disk device includes: a flash memory having a data storage area and an erasing-condition storage area in which an erasing condition has been written in advance. A CPU is provided and functions as a memory controller. A voltage controlling circuit is provided for changing applied voltages VCC and VPP under the control of the CPU. The CPU has the power supply voltage calculating capability of comparing the erasing condition stored in the erasing-condition storage area of the flash memory with a predetermined reference condition, and determining an optimal power supply voltage for each block so that the actual erasing time for each block becomes equal to a minimized constant value.

REFERENCES:
patent: 5406529 (1995-04-01), Asano
patent: 5418752 (1995-05-01), Harari et al.

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