Refresh control device

Abstract

A refresh control device may include a first oscillator configured to generate a first oscillation signal, a second oscillator configured to generate a second oscillation signal having a different cycle from the first oscillation signal, a first address controller configured to latch an address in response to the first oscillation signal, and output the latched address when a refresh signal is enabled. The refresh control device may also include a second address controller configured to latch the address in response to the second oscillation signal, and output the latched address when the refresh signal is enabled. Further included may be a selector configured to select any one of the output of the first address controller and the output of the second address controller in response to a select signal, and output the selected output as a row hammer address.

Description

CROSS-REFERENCES TO RELATED APPLICATION[0001]The present application claims priority under 35 U.S.C. § 119(a) to Korean application number 10-2016-0123184, filed on Sep. 26, 2016, in the Korean Intellectual Property Office, which is incorporated herein by reference in its entirety.BACKGROUND1. Technical Field[0002]Various embodiments relate to a refresh control device, and more particularly, to a technique for overcoming row hammering.2. Related Art[0003]With the increase in integration density of memories, a pitch between word lines included in a memory has been reduced. The reduction of the pitch between word lines has increased a coupling effect between adjacent word lines.[0004]Whenever data is inputted to or outputted from a memory cell, a word line toggles between an active state and an inactive state. However, the above-described increase in coupling effect between adjacent word lines may damage data of a memory cell coupled to a word line adjacent to a word line which is fre...

AI Technical Summary

Benefits of technology

The patent is about a device that controls refreshing for computer memory. It uses multiple oscillators to create a unique address that helps to reduce the chance of problems with refreshing. This can improve the reliability of computer memory and prevent it from failing.

Problems solved by technology

However, the above-described increase in coupling effect between adjacent word lines may damage data of a memory cell coupled to a word line adjacent to a word line which is frequently activated.

Word line disturbance may damage data of a memory cell before the memory cell is refreshed.

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