摘要:
A semiconductor device includes a memory cell array having memory cells arranged in a matrix form, a plurality of bit lines for communicating information to the memory cells, and a plurality of word lines crossing the bit lines to select among the memory cells, a plurality of sense amplifiers for amplifying data read out onto the bit lines, a plurality of data lines for transferring data amplified by the sense amplifiers to the outside of the cell array, the plurality of data lines including first and second wiring layers, a plurality of column select circuits for controlling connections of the plurality of data lines and the plurality of sense amplifiers, and a plurality of control signal lines connected to the plurality of column select circuits, the plurality of control lines including third and fourth wiring layers.
摘要:
There is provided a semiconductor memory having a reduced power consumption in data access and a high access speed in a NAND cell array scheme in which a memory cell unit is constituted by cascade-connecting a plurality of memory cells with each other. A memory cell array is divided into a plurality of sub-arrays, and the divided sub-arrays are selectively activated, thereby decreasing the capacitances of the word lines, register word lines, bit lines, and the like which are charged/discharged in data access.
摘要:
A semiconductor memory device comprises a memory array in which word lines are driven by a single decoder or a plurality of memory arrays driven by a plurality of decoders operating with the same row address, in the memory array or memory arrays memory cell units in which a plurality of memory cells are connected in series being arranged in the form of an array, a plurality of sense amplifier arrays constituted by arranging a plurality of sense amplifiers each provided for a pair of bit lines or a plurality of pairs of bit lines to read out data from the memory cells of the memory cell arrays, the sense amplifier arrays being divided into a plurality of blocks, and the blocks corresponding to one memory cell array, a register array having a plurality of registers for storing data read out by the plurality of sense amplifiers, the register array being divided into a plurality of blocks, and the blocks corresponding to the sense amplifier block and one memory cell array, and a control circuit for independently controlling the blocks of the sense amplifier arrays and the register array and independently reading out data from the registers in the blocks.
摘要:
A semiconductor memory device comprises a memory cell array including NAND type memory cell units arranged in matrix and having a plurality of dynamic type memory cells connected in series, a plurality of word lines, a plurality of bit lines arranged within the memory cell array, the plurality of bit lines including a bit line pairs which are arranged adjacent to each other or between which at least one bit line is interposed, and a plurality of sense amplifiers of a folded bit line type, provided in each of the plurality of bit line pairs, in which the memory cells are provided in positions corresponding to intersections of the bit lines and the word lines, and complementary data are written to two memory cells connected to each of the plurality of bit line pairs and one word line, and the two memory cells store one-bit data.
摘要:
A sense amplifier is connected between memory cell arrays, a re-writing register is arranged in position adjacent to the sense amplifier, transfer gates are disposed between the sense amplifier and the memory cell arrays, transfer gates are provided between bit lines of the memory cell arrays and global bit lines, and a gate control circuit for controlling the transfer gates is provided. When readout data is written into the register, the node of the sense amplifier is electrically separated from the bit lines and global bit lines.
摘要:
A sense amplifier is connected between memory cell arrays, a re-writing register is arranged adjacent to the sense amplifier, first transfer gates are disposed between the sense amplifier and the memory cell arrays, second transfer gates are provided between bit lines of the memory cell arrays and global bit lines, and a gate control circuit for controlling the transfer gates is provided. When readout data is written into the register, the node of the sense amplifier is electrically separated from the bit lines and global bit lines.
摘要:
In a semiconductor memory device wherein a plurality of memory cell units formed by connecting a plurality of memory cells in series are provided and each of the memory cell units is connected to a bit line, the semiconductor memory device comprises control circuit for directly reading data of a register cell during a reading operation when the previous row address designates the same memory cell as the present row address, and a data changing controlling circuit for changing data of an arbitrary memory cell of the memory cell unit to data of the memory cell closest to the bit line contact in the memory cell unit, and a row decoder for corresponding row addresses which select the memory of memory cell units, to the upper addresses than the parts of the row addresses which select a memory unit among the memory cell units.
摘要:
According to the present invention, there is provided a semiconductor device comprising: a power supply circuit which receives an external power supply voltage supplied, and outputs an internal power supply voltage not higher than the external power supply voltage; a system module which receives the internal power supply voltage, and performs a predetermined operation; and a performance monitor circuit which measures a processing speed of said system module when the internal power supply voltage is applied, and, on the basis of the processing speed, outputs a first control signal which requests to set the external power supply voltage at a first level, and a second control signal which requests said power supply circuit to set the internal power supply voltage at a second level, wherein said power supply circuit outputs the internal power supply voltage having the second level on the basis of the second control signal applied thereto.
摘要:
A chain type ferroelectric random access memory has a memory cell unit including ferroelectric memory cells electrically connected in series to each other, a plate line connected to an electrode of the memory cell unit, a bit line connected to the other electrode of the memory cell unit via a switching transistor, a sense amplifier which amplifies the voltages of this bit line and its complementary bit line, and a transistor inserted between the switching transistor and the sense amplifier. A value, being the minimum value of the gate voltage in the transistor obtained during elevation of the plate line voltage and comparative amplification, is smaller than a value, being the maximum value of the gate voltage in the transistor obtained during fall of the plate line voltage and comparative amplification. With these features, decrease in the accumulated charge of polarization in the memory cell is reduced and occurrence of disturb is prevented during read/write operations.
摘要:
A ferroelectric memory has a memory cell array of memory cells having ferroelectric capacitors, which is divided into a plurality of blocks, a boost power circuit provided in each block of the memory cell array to generate a boost voltage required for operation of the memory, a boost power switch provided between a power line connected to an external power terminal and a power supply terminal of each boost power circuit, and remaining ON during normal operation of the memory, a voltage detector circuit for detecting a drop of voltage level of the power line, and a switch control circuit for turning off the boost power switches in the blocks of the memory cell array excluding the boost power switch in a currently selected block in response to the voltage detector circuit.