摘要:
A memory and a boundary searching method thereof are provided therein. When searching a boundary of a threshold voltage distribution of the memory, data errors resulted from tail bits of the memory would be corrected. Therefore, a sensing window could be broader, and the boundary of the threshold voltage distribution could be determined precisely.
摘要:
A Y-decoder includes a selection unit and a Y-MUX. The selection unit is coupled to the memory array for selecting the column lines. The Y-MUX is coupled to the selection unit for supplying a voltage to the selected column line. The Y-MUX includes a first switch, a second switch, a third switch and a fourth switch coupled in parallel. The first switch and the second switch are respectively for receiving a first shielding voltage and a second shielding voltage. The third switch and the fourth switch are respectively for receiving a first sensing voltage and a second sensing voltage.
摘要:
A memory and a boundary searching method thereof are provided therein. When searching a boundary of a threshold voltage distribution of the memory, data errors resulted from tail bits of the memory would be corrected. Therefore, a sensing window could be broader, and the boundary of the threshold voltage distribution could be determined precisely.
摘要:
A program method for a multi-level cell (MLC) flash memory is provided. The memory array includes a plurality of pages and a plurality of paired pages, which correspond to the respective pages. The program method includes the following steps. Firstly, a program address command is obtained. Next, whether the program address command corresponding to any one of the paired pages is determined. When the program address command corresponds to a first paired page, which corresponds to a first page among the pages, among the paired pages, data stored in the first page to a non-volatile memory are copied. After that, the first paired page is programmed.
摘要:
Some embodiments of the present invention provide a memory device including a first memory array having a first word line and a comparator circuit having a first terminal coupled to a reference voltage and a second terminal coupled to a first switch selectively coupling the first word line to a power source or the second terminal. In an embodiment, the reference voltage is selected for identifying a leakage condition associated with the first word line. In another embodiment, the first switch is configured to couple the first word line to the power source for a first predetermined period of time to allow charging of the first word line. In another embodiment, the first switch is configured to couple the first word line to the second terminal of the comparator for at least a second predetermined period of time.
摘要:
In response to a disagreement between a previously generated check code associated with previously programmed data bits and a more recently generated check code generated in response to a read command, the comparison process is changed, between i) a value representing accessed data and ii) a reference applied to such accesses to distinguish between logical levels. For example, the read bias arrangement and/or a read reference of a memory integrated circuit is changed.
摘要:
A memory cell array, such as an EEPROM flash memory array, includes a current limiting circuit that limits a sum of leakage currents from nonselected memory cells during operation of the array, such as during a programming operation.
摘要:
A method for designing a circuit layout of non-neighboring metal bit lines to reduce coupling effect in sensing operation is disclosed. The method comprises providing a memory array having a plurality of bit lines arranged sequentially, wherein every two adjacent bit lines are paired in the sensing operation of a memory cell in the memory array. The first embodiment is presented by assigning a first pair of the bit lines permuted with each other to create a non-neighboring bit line layout. The second embodiment is presented by inserting one of a second pair of the bit lines into a first pair of bit lines to separate the first pair of bit lines in layout design. The method further comprises shrinking the layout space between two adjacent non-paired bit lines. In this way, the method contributes to the reduction of metal bit line coupling effect without any trade off of integrated circuit density by modifying the circuit layout of metal bit lines to a non-neighboring bit line arrangement in a memory array.
摘要:
According to an embodiment of the present invention, a method for detecting word line leakage in a memory device includes coupling a first word line in the memory device to a voltage source while coupling a second word line in the memory device to a ground level voltage. Next, the first word line is decoupled from the voltage source. The method also includes comparing a current of the first word line with a predetermined reference current for determining a leakage condition of the word line.
摘要:
A method for detecting word line leakage in a memory device includes coupling a first plurality of word lines in the memory device to a voltage source while grounding a second plurality of word lines. Each of the second plurality of word lines is adjacent to a corresponding one of the first plurality of word lines. The method includes waiting for a period of time to allow the word lines to reach a predetermined read voltage level. The method also includes decoupling the first plurality of word lines from the voltage source and waiting for a second predetermined period of time to allow the first plurality of word lines to discharge. The method further includes sensing a current associated with the word lines, and comparing the current with a predetermined reference current which is selected for identifying a word line leakage condition associated with the first plurality of word lines.