摘要:
A semiconductor storage device according to the present invention comprises one or more memory planes 8 comprising a plurality of memory blocks 9, and a block selection circuit for decoding an block address signal for selecting the memory block 9 from the memory plane 8 to select the memory block, generates a dummy block address for selecting a dummy block that is different from the selected block address and a defective block address of a defective block by a predetermined logical operation targeted for a specific partial bit in address bits of the selected block address when the defective block is contained in the memory plane. A bit line connected to the selected memory cell selected by the selected block address and a bit line in the dummy block are connected to differential input terminals of a sense amplifier circuit 9.
摘要:
A nonvolatile semiconductor storing device according to the present invention comprises a block replacing means for replacing a defective block with a redundant block when a memory block in a memory array is the defective block. The block replacing means includes an address translation circuit 10 for converting an inputted external block address into an internal block address by inverting an address bit corresponding to dissident of each address bit between a defective block address of the defective block and a redundant block address among address bits of the inputted external block address, and each of the memory blocks 5 is selected based on the internal block address after the translation of the external block address inputted from outside by the address translation circuit 10.
摘要:
A semiconductor storage device according to the present invention comprises one or more memory planes 8 comprising a plurality of memory blocks 9, and a block selection circuit for decoding an block address signal for selecting the memory block 9 from the memory plane 8 to select the memory block, generates a dummy block address for selecting a dummy block that is different from the selected block address and a defective block address of a defective block by a predetermined logical operation targeted for a specific partial bit in address bits of the selected block address when the defective block is contained in the memory plane. A bit line connected to the selected memory cell selected by the selected block address and a bit line in the dummy block are connected to differential input terminals of a sense amplifier circuit 9.
摘要:
Two bias circuits which supply a current to a selected memory cell and a reference memory cell have the same circuit constitution. Each bias circuit includes a first active element between a power supply node and a junction node, where a current is controlled to prevent a voltage level at the junction node from fluctuating, a second active element between the power supply node and an output node, where a current is controlled such that a voltage level at the output node is changed in direction opposite to a voltage level at the junction node in other bias circuit, a third active element and a fourth active element between the junction node and a current supply node and between the output node and the current supply node, respectively, where a bias voltage is adjusted.
摘要:
A semiconductor memory device comprises at least one memory plane in which a plurality of memory blocks are arranged, and a block decoder circuit which decodes a block address signal for selecting the memory block from the memory plane and outputs block selection signals for selecting the memory block, as well as puts all of the block selection signals in a selected state and output them in a predetermined test mode, and a block selection signal inversion circuit which inverts or non-inverts signal levels of the block selection signals.
摘要:
A semiconductor memory device comprises at least one memory plane in which a plurality of memory blocks are arranged, and a block decoder circuit which decodes a block address signal for selecting the memory block from the memory plane and outputs block selection signals for selecting the memory block, as well as puts all of the block selection signals in a selected state and output them in a predetermined test mode, and a block selection signal inversion circuit which inverts or non-inverts signal levels of the block selection signals.
摘要:
A nonvolatile semiconductor storing device according to the present invention comprises a block replacing means for replacing a defective block with a redundant block when a memory block in a memory array is the defective block. The block replacing means includes an address translation circuit 10 for converting an inputted external block address into an internal block address by inverting an address bit corresponding to dissident of each address bit between a defective block address of the defective block and a redundant block address among address bits of the inputted external block address, and each of the memory blocks 5 is selected based on the internal block address after the translation of the external block address inputted from outside by the address translation circuit 10.
摘要:
Two bias circuits which supply a current to a selected memory cell and a reference memory cell have the same circuit constitution. Each bias circuit includes a first active element between a power supply node and a junction node, where a current is controlled to prevent a voltage level at the junction node from fluctuating, a second active element between the power supply node and an output node, where a current is controlled such that a voltage level at the output node is changed in direction opposite to a voltage level at the junction node in other bias circuit, a third active element and a fourth active element between the junction node and a current supply node and between the output node and the current supply node, respectively, where a bias voltage is adjusted.
摘要:
A nonvolatile semiconductor memory device comprises a readout circuit which reads data stored in a selected memory cell by applying predetermined voltage to the selected memory cell and a reference cell such that currents corresponding to the respective threshold voltage may flow, and comparing the current flowing in the selected memory cell with the current flowing in the reference cell. The readout circuit commonly uses the reference cell set in the same storage state for normal readout and for readout for program verification, and when the predetermined voltage is applied to the selected memory cell and the reference memory cell at the time of the readout for the program verification, it sets an applying condition to the reference memory cell such that its storage state may be shifted more in the program state direction than that in an applying condition at the time of the normal readout.
摘要:
A semiconductor memory device is provided, which comprising a memory cell array comprising a two-value memory region and a multi-value memory region, in which the two-value memory region comprises a plurality of memory cells each storing 1-bit data and the multi-value memory region comprises a plurality of memory cells each storing 2 or more-bit data, and a sense amplifier section common to data read of the two-value memory region and data read of the multi-value memory region, for reading data stored in a selected memory cell by comparing a potential of the selected memory cell with a reference potential.