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:
This disclosure concerns a device outputting data to the outside comprising a first transistor with a first conductive type which is connected between an output low voltage corresponding to a first logical value and the pad and which connects the output low voltage to the pad when the digital data has the first logical value; a second transistor with a second conductive type which is connected between an output high voltage corresponding to a second logical value and the pad and which connects the output high voltage to the pad when the digital data has the second logical value; and a third transistor with the first conductive type which is connected between the output high voltage and the pad so as to be parallel to the second transistor and which connects the output high voltage to the pad when the digital data has the second logical value.
摘要:
In an FCRAM having a late write function, when a first command signal indicates “write active”, whether a write operation or an auto-refresh operation is to be performed is determined on the basis of a second command signal. For example, when the second command signal indicates “write”, a write operation for a memory cell is performed by a late write scheme. When the second command signal indicates “auto-refresh”, an auto-refresh operation is performed. In the last write cycle of a write operation immediately preceding this auto-refresh operation, addresses for selecting a memory cell as an object of auto-refresh are predetermined. After data write to a memory cell is completed in the last write cycle, row precharge for auto-refresh is performed. After that, an auto-refresh operation (i.e., a data read operation and a data restore operation) is performed for the selected memory cell.
摘要:
An input data register for latching write data is arranged in a position near a memory cell array of a memory core section. The input data register is arranged on the upstream side of a data path used for writing data into a memory cell. Write data input to a data pin which is arranged in the end position on the downstream side is latched in the input data register via a data input buffer, serial/parallel converting circuit and write data line. Data latched in the input data register is written into a memory cell via a DQ write driver, data line pair, I/O gate and bit line pair in a next write cycle.
摘要:
A semiconductor integrated circuit has an internal clock signal generator circuit and a data input/output circuit. The internal clock signal generator circuit includes a clock receiver, a synchronous delay control circuit, a clock driver, an output control circuit, a delay monitor, and a control signal generator circuit. Accordingly, in a delay measuring mode, a delay in the input signal is set in the delay monitor based on a measurement start signal and a measurement stop signal. After completion of the delay measuring mode, the delay monitor causes the signal CLK, outputted from the clock receiver, to lag behind by a delay set in the delay measuring mode. Further, the delay monitor outputs the delayed signal to the synchronous delay control circuit.
摘要:
A clock signal is supplied to an input buffer circuit. A delay circuit has a delay time equal to a difference between the cycle time for latency (CL) of 3 and the cycle time for latency of 2. When CL=2, a transfer gate outputs a clock signal delayed by the delay circuit, as a clock signal CLK2. The clock signal CLK2 initiates the operation in the second stage at the latency of 3. The operation at the latency of 2 can, therefore, be performed in a cycle time having a sufficient margin, without increasing the speed of the operation in the second stage at the latency of 3.
摘要:
A semiconductor memory device includes a silicon chip and sub-arrays formed in the chip. In each of the sub-arrays, memory cells arranged in a matrix form, word lines provided for respective rows of each of the sub-arrays, and bit lines provided for respective columns of each of the sub-arrays are arranged. Further, in the chip, amplifier groups for amplifying data read out from the memory cells are arranged for the respective sub-arrays. Amplifiers connected to respective bit lines are provided in the amplifier groups and the amplifiers each have a function of continuously holding data read out from the memory cell.
摘要:
A semiconductor memory device having: a RAM port for randomly accessing a memory cell array having memory cells disposed in matrix; a SAM port for serially accessing data of one row of the memory cell array; a mode switching unit for switching the operation mode of the SAM port between an ordinary data output mode and a test mode, upon externally receiving a mode switching signal; and an address pointer outputting unit for outputting an address pointer of the SAM port when the operation mode is switched to the test mode by the mode switching unit.
摘要:
There is disclosed a semiconductor integrated circuit device comprising: an external input signal lead provided outside a semiconductor chip; a power supply lead provided outside the semiconductor chip; a first electrode connected to an internal circuit on the semiconductor chip, and arranged close to the external input signal lead, wherein when the circuit is caused to be operative, the first electrode is connected to the external input signal lead; and a second electrode connected to the first electrode on the semiconductor chip, and arranged close to said power supply lead, wherein when the circuit is not caused to be operative, the second electrode is connected to the power supply lead. This invention is applicable to the device wherein there are provided a plurality of internal circuits. In this case, a plurality of the first electrodes drawn out from the internal circuits are arranged close to the external input signal lead, and a plurality of the second electrodes similarly drawn out from the internal circuits are arranged close to the power supply lead.