Invention Grant
- Patent Title: Write verify method for resistive random access memory
- Patent Title (中): 电阻随机存取存储器的写验证方法
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Application No.: US12123647Application Date: 2008-05-20
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Publication No.: US07826248B2Publication Date: 2010-11-02
- Inventor: Haiwen Xi , Song S. Xue
- Applicant: Haiwen Xi , Song S. Xue
- Applicant Address: US CA Scotts Valley
- Assignee: Seagate Technology LLC
- Current Assignee: Seagate Technology LLC
- Current Assignee Address: US CA Scotts Valley
- Agency: Campbell Nelson Whipps LLC
- Main IPC: G11C11/00
- IPC: G11C11/00

Abstract:
Write verify methods for resistance random access memory (RRAM) are provided. The methods include applying a reset operation voltage pulse across a RRAM cell to change a resistance of the RRAM cell from a low resistance state to a high resistance state and setting a counter to zero. Then the method includes applying a forward resetting voltage pulse across the RRAM cell if the RRAM cell has a high resistance state resistance value less than a selected lower resistance limit value and adding one to the counter. This step is repeated until either the counter reaches a predetermined number or until the high resistance state resistance value is greater than the lower resistance limit value. The method also includes applying a reverse resetting voltage pulse across the RRAM cell if the RRAM cell has a high resistance state resistance values is greater than a selected upper resistance limit value and adding one to the counter. The reverse resetting voltage pulse has a second polarity being opposite the first polarity. This step is repeated until either the counter reaches a predetermined number or until all the high resistance state resistance value is less than the upper resistance limit value.
Public/Granted literature
- US20090290411A1 WRITE VERIFY METHOD FOR RESISTIVE RANDOM ACCESS MEMORY Public/Granted day:2009-11-26
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