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Oscillation device, method of oscillation, and memory device

A technique for oscillating devices and oscillating signals, which is applied in static memory, power oscillator, digital memory information, etc., and can solve problems such as different frequency division numbers

Active Publication Date: 2014-01-22
SOCIONEXT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for each semiconductor chip, it is difficult to set the period of the update request signal before redundancy longer than the period of the update request signal after redundancy with an appropriate margin because it is impossible to obtain a semiconductor chip from the outside. The number of divisions varies with the chip

Method used

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  • Oscillation device, method of oscillation, and memory device
  • Oscillation device, method of oscillation, and memory device
  • Oscillation device, method of oscillation, and memory device

Examples

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Embodiment Construction

[0021] Figure 12 is a schematic diagram showing the structure of a memory device. The oscillating device 1201 generates an update request signal S2. In the measurement mode, the test circuit 1203 specifies a frequency division number, and outputs data representing the specified frequency division number to the frequency divider 1206 through the selection circuit 104 . The oscillator 1205 outputs an oscillation signal S1. The frequency divider 1206 divides the frequency of the oscillation signal S1 by a specified frequency division number to output an update request signal S2. The period of the update request signal S2 is measured and the frequency division number for correcting the variation in the measured period is written into the fuse circuit 1202 . In the normal mode, the fuse circuit 1202 outputs data representing the written frequency division number to the frequency divider 1206 through the selection circuit 1204 . Therefore, the oscillating means 1201 can generat...

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Abstract

An oscillation device includes a first setting unit (102ˆ¼104) that outputs an oscillation period designation signal, a calculating unit (111) that performs an arithmetic operation on the oscillation period designation signal to provide some margin, and an oscillating unit (105,106) that generates an oscillation signal having a period based on the oscillation period designation signal subjected to the arithmetic operation. The device may be used, for example, to adjust the period of a refresh request signal in a semiconductor chip, to reduce a variation in required period of the refresh request signal between different chips.

Description

technical field [0001] The present invention relates to an oscillating device, an oscillating method, and a memory device. Background technique [0002] The memory includes an oscillator for generating a self-refresh request signal. Unfortunately, due to process variations, the oscillation period of the oscillator also varies. It is thus disadvantageous that the required update time varies from semiconductor chip to semiconductor chip. In order to overcome this disadvantage, in the trial test, the frequency division number of the refresh request signal for each semiconductor chip was changed. Therefore, the period of the refresh request signal is adjusted to reduce variation in the period required for the refresh request signal between semiconductor chips. [0003] The memory includes normal memory cells and redundant memory cells. The problem that arises in this case lies in the first tentative test before replacing normal memory cells with redundant memory cells (herei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11C11/406H03B19/00
CPCG11C29/14G11C2211/4061G11C29/023G11C11/406G11C29/50G11C29/50012G11C29/028G11C29/12015G11C29/02G11C11/4076
Inventor 富田浩由
Owner SOCIONEXT INC