Page buffer and related reading method
First Claim
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1. A reading method comprising:
- a unitary operation, the unitary operation adapted to execute either a normal read operation or a copyback read operation using a page buffer, the unitary operation comprising;
initializing a latch to store a first logic value;
sensing a voltage level corresponding to a programming state of a selected memory cell; and
,selectively storing a second logic value in the latch in response to the sensed voltage level,wherein the page buffer enters a programming operation mode when the second logic value is stored in the latch.
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Abstract
A page buffer and a reading method comprising a unitary operation adapted to execute either a normal read operation or a copyback read operation using a page buffer are disclosed. The unitary operation comprises initializing a latch to store a first logic value; sensing a voltage level corresponding to a programming state of a selected memory cell; and selectively storing a second logic value in the latch in response to the sensed voltage level, wherein the page buffer enters a programming operation mode when the second logic value is stored in the latch.
7 Citations
16 Claims
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1. A reading method comprising:
a unitary operation, the unitary operation adapted to execute either a normal read operation or a copyback read operation using a page buffer, the unitary operation comprising; initializing a latch to store a first logic value; sensing a voltage level corresponding to a programming state of a selected memory cell; and
,selectively storing a second logic value in the latch in response to the sensed voltage level, wherein the page buffer enters a programming operation mode when the second logic value is stored in the latch. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for performing a copyback read operation in a page buffer comprising:
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initializing a latch to store a first logic value; sensing a voltage level corresponding to a programming state of a selected memory cell; and
,selectively storing a second logic value in the latch in response to the sensed voltage level, wherein the page buffer enters a programming operation mode when the second logic value is stored in the latch. - View Dependent Claims (8, 9, 10)
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11. A page buffer adapted to perform either a normal read operation or a copyback read operation using a unitary operation, the page buffer comprising:
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a bitline select and bias unit adapted to select a bitline corresponding to a selected memory cell; a precharge unit adapted to precharge the bitline; and
,a sense and latch unit adapted to sense a level of a voltage apparent on the bitline and store a logic value in a latch in response to the sensed voltage level, wherein the latch is initialized to store a first logic value during each of the normal read operation and the copyback read operation; and
,wherein the value stored in the latch changes from the first logic value to a second logic value if the sensed voltage level indicates that the selected memory cell is programmed. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification