摘要:
The disclosed semiconductor memory comprises a random access memory port, a serial access memory port, a data transfer gate formed between the two ports, and in particular a test signal generating circuit for generating a test signal to the data transfer gate to close the gate so that data stored in the serial access memory port can be read to outside, without transferring data from the random access memory port to the serial access memory port. Therefore, it is possible to discriminate an erroneous operation caused when data are read from the serial access memory port from that caused when data are transferred from the random access memory port to the serial access memory port.
摘要:
A multiport memory has a RAM port including a memory cell array having a plurality of memory cells arranged in a matrix form, sense amplifier circuit for sensing potential of a bit line after the storage potential has been transferred from the memory cells, restore circuit connected to the bit line for pulling up the potential of the bit line at the predetermined timing after sense operation has been started and a barrier circuit connected between the bit line and the sense amplifier circuit; and a SAM port including a data register, transfer gate and functional means for transferring serial data in the column direction. In this memory, the RAM port is connected to the SAM port by the transfer gate with the bit line directly connected to the data register, and the potentials at the bit line are amplified by the sense amplifier circuit and are directly transferred to the data register.
摘要:
In a semiconductor memory system of the serial column access type, a redundant column is used for replacing a defective column. Redundant data lines are connected to the redundant column through a redundant column selection gate. A defective address detection circuit detects the address of a defective column to enable the redundant column selection gate. An address counter is provided for a defective address detection circuit. A redundant column selection circuit selects the redundant column in response to a detection signal from the defective address detection circuit. A data line switching circuit switches, in redundant column select mode, the data lines connecting to a data input/output drive circuit from said regular data lines to the redundant data lines. With this circuit arrangement, in a redundant column select mode, the regular data lines are separated from the data input/output drive circuit. Therefore, even if a shift register constituting a regular column selection circuit operates and the defective column selection gate is enabled to set up a connection of the defective column to the regular data lines, the error data from the defective column is never output. Further, the shift register is operable irrespective of the defective column detection.
摘要:
A semiconductor memory device determines the level of a select control signal, according to the level of drive signals for two systems as generated in the preceding access cycle, and the level of the least significant bit of an address to fetch data in a desired serial access cycle. In accordance with this select signal, a select circuit selects one of the drive signals as generated by drive signal generating circuits, and supplies the selected signal to two data selecting/fetching systems. The function of this select circuit allows one of the two data selecting/fetching systems to first start the data access operation.
摘要:
A flip-flop circuit has a power terminal set at 5 V, first and second output terminals, a latch section for charging one of the first and second terminals to 5 V and discharging the other one of the first and second terminals to 0 V in accordance with an input signal, a first MOS transistor having a current path connected between the power and first output terminals, a second MOS transistor for charging the gate of the first MOS transistor while the potential of the second output terminal is changed from 5 V to 0 V, and a capacitor for bootstrapping the gate potential of the first MOS transistor to turn on the first MOS transistor. The flip-flop circuit further includes a third MOS transistor, having a current path connected between the gate of the first MOS transistor and the first output terminal and a gate connected to the first output terminal, for charging the gate of the first MOS transistor when the gate potential of the first MOS transistor is dropped a predetermined level in comparison with that of the first output terminal.
摘要:
The present invention provides a method for writing data to a non-volatile memory device having first wirings and second wirings intersecting one another and memory cells arranged at each intersection therebetween, each of the memory cells having a variable resistive element and a rectifying element connected in series. According to the method, the second wirings are charged to a certain voltage not less than a rectifying-element threshold value, prior to a rise in a selected first wiring. Then, a selected first wiring is charged to a voltage required for writing or erasing, after which a selected second wiring is discharged.
摘要:
A semiconductor device including a circuit substrate including n number of terminals; a semiconductor chip provided on the circuit substrate and including n number of terminals; and a relay chip including a triangular substrate having a first side, a second side and a third side which form triangle, n number of first terminals located along the first side, n number of second terminals located along the second side, and a plurality of wires connecting the first terminals and the second terminals respectively; a first wire connecting each of the n number of terminals of the circuit substrate to a corresponding first terminal among the n number of first terminals; and a second wire connecting each of the n number of terminals of the semiconductor chip to a corresponding second terminal among the n number of second terminals.
摘要:
A semiconductor device, a semiconductor memory tester, and a multi-chip package are provided. The semiconductor device includes a plurality of nonvolatile semiconductor memories; a boosting circuit which generates a boosted voltage for operating the plurality of nonvolatile semiconductor memories; and a boosting circuit controller which controls the operation of the boosting circuit to generate the boosted voltage on the basis of an operation sequence of the plurality of nonvolatile semiconductor memories.
摘要:
A method of programming a non-volatile memory device with memory cells formed of variable resistance elements and disposed between word lines and bit lines, includes: previously charging a selected word line and a selected bit line together with a non-selected word line and a non-selected bit line up to a certain voltage; and further charging the selected word line and the non-selected bit line up to a program voltage higher than the certain voltage and a program-block voltage, respectively, and simultaneously discharging the selected bit line.
摘要:
A semiconductor device according to the present invention includes a substrate including a plurality of first pads thereon; at least one semiconductor chip including a plurality of second pads; and at least one wiring chip including a plurality of third pads. A part of the plurality of second pads of the semiconductor chip is electrically connected to a part of the plurality of third pads of the wiring chip, and another part of the plurality of third pads of the wiring chip is electrically connected to a part of the plurality of first pads of the substrate. The plurality of third pads of the wiring chip are located along two adjacent sides of a wiring chip substrate of the wiring chip, and are connected to each other by a plurality of metal wires, sequentially from the third pads closest from a contact point of the two sides; The plurality of metal wires each include a first part drawn from each of the plurality of third pads located along a first side of the two sides inward the wiring chip so as to be parallel to, or so as to form an acute angle with, a second side of the two sides, a second part drawn from each of the plurality of third pads located along the second side inward the wiring chip so as to be parallel to, or so as to form an acute angle with, the first side, and a third part connecting the first part and the second part to each other in a straight manner. The plurality of metal wires are formed such that a wiring width of each metal wire, a wiring interval between each metal wire and a metal wire adjacent and outer thereto, and a wiring pitch which is a sum of each wiring width and a corresponding wiring interval are set so as to minimize a difference between wiring capacitances of each adjacent metal wires among the plurality of metal wires.