Abstract:
전원이 순간 정지되었을 때의 데이터를 리커버리 하는 기능을 갖춘 메모리 회로를 제공하는 것을 목적으로 한다. 본 발명의 메모리 회로(100)는, 노드(N1) 및 노드(N2)에 상보적인 관계의 데이터를 유지 가능한 쌍안정 회로와, 노드(N1)에 접속된 제1 비휘발성 메모리 회로(NV1)와, 노드(N2)에 접속된 제2 비휘발성 메모리 회로(NV2)를 가지고, 제1 비휘발성 메모리 회로(NV1)는, 부트 데이터를 저장하고, 제2 비휘발성 메모리 회로(NV2)는, 제2 노드에 유지된 데이터를 저장했을 때, 제2 노드에 유지된 데이터의 논리 레벨을 반전시킨다.
Abstract:
PROBLEM TO BE SOLVED: To provide an improved multiport SRAM.SOLUTION: In a multiple port SRAM 10, a first bit cell 38 is coupled to a first word line WL0A and a second word line WL0B and a first bit line pair BL0A/BL0Ab and a second bit line pair BL0B/BL0Bb. A first data line pair DLA, DLAb is coupled to the first bit line pair via first switching logic 52, 54. A second data line pair DLB, DLBb is coupled to the first bit line pair via second switching logic 56, 58 and to the second bit line pair via third switching logic 60, 62. If a row address match but not a column address match exists between a first access address and a second access address, the second switching logic selectively connects the second data line pair with the first bit line pair based on a first decoded signal generated from the column address of the second access address, and the third switching logic decouples the second data line pair from the second bit line pair.
Abstract:
PROBLEM TO BE SOLVED: To suppress data corruption of a memory cell.SOLUTION: Bit line potential detection circuits BD00, BD01 are respectively connected to bit line pairs B00, xB00, B01, xB01. Bit line potential detection circuits BD10, BD11 are respectively connected to bit line pairs B10, xB10, B11, xB11. The bit line potential detection circuits BD00 to BD11 detect potential differences of the bit line pairs B00, xB00 to B00, xB11, and output detection signals DS00 to DS11 of levels corresponding to detection results. A word line voltage adjustment circuit 31 outputs a level adjustment signal WLC on the basis of detection signals DS00 to DS11 of the bit line potential detection circuits BD00 to BD11. A word line driver 21 connected to a selected word line WL0 supplies a high potential power supply voltage or a voltage lower than the high potential power supply voltage by a predetermined value to the word line WL0 in accordance with the level adjustment signal WLC.
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor storage device capable of suppressing rush current when the power is turned on.SOLUTION: A word line potential-fixing circuit 10 fixes the potentials of word lines wl_0 to wl_m to low level so that, when the power of a memory cell MC is turned on, the memory cell MC is not subjected to row selection before the power of the memory cell MC is completely turned on, and releases fixing of the potentials of the word lines wl_0 to wl_m when the power of the memory cell MC is completely turned on.