PHASE CHANGE MEMORY APPARATUS
First Claim
1. A phase change memory apparatus comprising the memory cell such that the apparatus is configured to perform a write verify function in the memory cell, wherein the phase change memory apparatus is configured to write a first state level data or a second state level data in the memory cell such that when the first state level data is written, then the apparatus is configured to perform a verify read function as a first voltage level, and when the second state level data is written, then the apparatus is configured to perform the verify read function as a second voltage level.
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Abstract
A phase change memory apparatus is presented. The phase change memory apparatus includes a phase change memory cell, a sense amplifier, and a voltage selecting unit. The sense amplifier is configured to differentially amplify a current that through the memory cell and a comparison voltage. The voltage selecting unit is configured to provide a reference voltage as the comparison voltage when performing a normal read function and to selectively provide either a first voltage level or a second voltage level as the comparison voltage in accordance with data when performing a verify read function.
97 Citations
10 Claims
- 1. A phase change memory apparatus comprising the memory cell such that the apparatus is configured to perform a write verify function in the memory cell, wherein the phase change memory apparatus is configured to write a first state level data or a second state level data in the memory cell such that when the first state level data is written, then the apparatus is configured to perform a verify read function as a first voltage level, and when the second state level data is written, then the apparatus is configured to perform the verify read function as a second voltage level.
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4. A phase change memory apparatus comprising:
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a phase change memory cell; a sense amplifier configured to differentially amplify a current that through the memory cell and a comparison voltage; and a voltage selecting unit configured to provide a reference voltage as the comparison voltage when performing a normal read function and to selectively provide either a first voltage level or a second voltage level as the comparison voltage in accordance with data when performing a verify read function. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification