Patent ID: 8659950
Filing Date: 2014-02-25
Classification: G11C

Abstract:
1. A semiconductor memory device, comprising: a memory array, formed by a plurality of memory cell units configured as a matrix, wherein each of the memory cell units is formed by a plurality of electronic rewritable memory elements coupled in series; a bit line, coupled to a drain side of the memory cell units; a first source line, coupled to a source side of even number memory cell units of the memory cell units; a second source line, coupled to a source side of odd number memory cell units of the memory cell units; a row selection circuit, selecting memory elements in a row direction of the memory elements in the memory cell units; a first selection circuit, selecting an even number bit line or an odd number bit line coupled to a sensing circuit; a second selection circuit, selecting the even number bit line or the odd number bit line coupled to a voltage supply; and a source voltage supply circuit, supplying voltage to the first source line and the second source line, wherein when the even number bit line is selected by the first selection circuit, the odd number bit line is selected by the second selection circuit, when the odd number bit line is selected by the first selection circuit, the even number bit line is selected by the second selection circuit, when the even number bit line is selected by the first selection circuit, a first voltage from the sensing circuit is supplied to the even number bit line, a reference voltage is supplied to the first source line by the source voltage supply circuit, a second voltage from the voltage supply is supplied to the odd number bit line, a third voltage is supplied to the second source line by the source voltage supply circuit, and the third voltage is equal to the second voltage, when the odd number bit line is selected by the first selection circuit, the first voltage from the sensing circuit is supplied to the odd number bit line, the reference voltage is supplied to the second source line by the source voltage supply circuit, the second voltage from the voltage supply is supplied to the even number bit line, and the third voltage is supplied to the first source line by the source voltage supply circuit.