摘要:
A clock generation circuit includes a clock input circuit receiving complementary external clocks to generate an internal clock, a variable delay circuit delaying the internal clock to generate an internal operation clock, a replica circuit further delaying the internal operation clock by a predetermined time to generate a return clock, a phase comparator directly comparing the phase where potential levels of external clocks cross with the phase of the return clock, and a delay control circuit adjusting the delay amount of the variable delay circuit according to a phase comparison result of the phase comparator.
摘要:
An input signal phase compensation circuit having a monitor mode and a normal operation mode includes a mode switching circuit, a logic gate receiving an internal data signal, a delay circuit connected to the logic gate, and a phase comparator comparing, in the monitor mode, phases of a signal output from the delay circuit and a clock signal, and determining time for delaying an internal clock signal in a variable delay circuit so as to match phases of the both signals. In the normal operation mode, the time is fixed, and data is obtained at phase compensated timing.
摘要:
A graphic data processing device is proposed that enables high-speed graphic processing for repeated graphic in semiconductor layout data. A plurality of sets of systematic array graphic data are inputted in an input device, the inputted systematic array graphic data are checked in an array information analyzer to confirm that the grid widths of the array grids of the different data are equal, and data are converted at an array graphic converter to systematic array graphic data sharing common array grid information. The data can then undergo graphic processing at a graphic processor in the form of systematic array graphic data without further alteration.
摘要:
A MOS random access memory device includes a semiconductor substrate having a trench formed therein, and an array of memory cells on the substrate. Each of the memory cells includes a 1-bit data-storage capacitor and a transfer-gate MOS transistor. The capacitor includes an insulated layer buried in the trench, which serves as a storage node. An island-shaped semiconductor layer covers the storage-node layer at least partially on the substrate, and is coupled thereto. The transistor has a source and a drain defining a channel region therebetween in the substrate, and an insulated gate overlying the channel region. One of the source and drain is directly coupled to the island-shaped layer, while the other of them is contacted with a corresponding data-transfer line (bit line) associated therewith.
摘要:
A structure of a semiconductor device and a method of manufacturing the same is provided wherein a leakage current can be reduced while improving a drain breakdown voltage of an Insulated-Gate transistor such as a MOSFET, MOSSIT and a MISFET, and a holding characteristic of a memory cell such as a DRAM using these transistors as switching transistors can be improved, and further a reliability of a gate oxide film in a transfer gate can be improved. More particularly, a narrow band gap semiconductor region such as Si.sub.x Ge.sub.1-x, Si.sub.x Sn.sub.1-x, PbS is formed in an interior of a source region or a drain region in the SOI.IG-device. By selecting location and/or mole fraction of the narrow band gap semiconductor region in a SOI film, or selecting a kind of impurity element to compensate the crystal lattice mismatching due to the narrow-bandgap semiconductor region, the generation of crystal defects can be suppressed. Further the structure that the influences of the crystal defects to the transistor or memory characteristics such as the leakage current can be suppressed, even if the crystal defects are generated, are also proposed.
摘要:
A semiconductor memory device comprises a semiconductor substrate having memory cell area, a plurality of trenches selectively formed in the memory cell area aligning in certain intervals and a plurality of memory cell arrays provided in the memory cell area, wherein each of the memory cell arrays comprises a plurality of MOS transistors connected in a serial array and a plurality of capacitors each formed in a corresponding one of the trenches. Each of the transistors has a gate electrode above the substrate with a gate insulating film formed therebetween and source and drain regions formed in the substrate on both sides of the gate electrode. Each of the capacitors includes a charge storage layer formed on an inner wall of each of the trenches and connected integrally to one of the source and drain regions of each of the transistors, a capacitor insulating film formed on the charge storage layer and a capacitor electrode formed on the capacitor insulating film so as to bury each of the trenches and extending to the surface of the substrate, which is formed on the surface of the substrate except for at least formation areas of the transistors.
摘要:
An encoding circuit shortens time required for a coincidence signal to be converted into an address code after selected and output sequentially according to a predetermined priority level when the coincidence signal is obtained from an associative memory. The circuit is provided with a contention arbitrating circuit for a lower subgroup and a contention arbitrating circuit for a higher subgroup. In the contention arbitrating circuit for a lower subgroup and the contention arbitrating circuit for higher subgroup, each coincidence signal simultaneously activates inhibiting signals whose priority levels are lower than the priority level of the coincidence signal. A lower half of coincidence signals are arranged in descending order in the contention arbitrating circuit for a lower subgroup and a higher half of coincidence signals are arranged in ascending order in the contention arbitrating circuit for a higher subgroup. The contention arbitrating circuit for a lower subgroup and the contention arbitrating circuit for a higher subgroup are arranged in a triangular array and a complementary triangular array, respectively.
摘要:
A data storing circuit including memory cells arranged in a plurality of rows and columns and flag cells corresponding to respective rows for storing flag information, the memory cells and the flag cell of the same row constituting one word, is provided. When a retrieval data is externally applied, the data included in the retrieval data is compared with the data of the memory cell, and the flag information stored in the retrieval data is compared with the flag stored in the flag cell. Respective results of comparison are output to a match line. Logical operation circuit carries out logical operation dependent on the result of comparison output to the match line, and writes the logical output to the flag cell of the data storing circuit.
摘要:
A bit line control circuit is disclosed for implementing a dynamic content addressable memory. The bit line control circuit includes a read circuit 12 and a first write circuit 13 connected to data line pairs DT, /DT, a sense amplifier 14, a bit line discharge circuit 15, a bit line charge circuit 16, a transfer gate circuit 17, and a second write circuit 18. The bit line control circuit is connected to a CAM cell array through bit lines BLa, /BLa. Various operations such as write, read, refresh and match detection and the like necessary in the dynamic associative memory can be implemented under simple timing control by a simple circuit configuration.
摘要:
A memory cell circuit of an associative memory composed of only four NMOS transistors is disclosed. Each memory cells of the circuit is connected two bit lines, a word line, a match setup line for commanding coincidence detection, and a match line for transferring the results of detection. The data signals are stored in the gate capacity of each of the transistors 3. This simplified memory cell circuit contributes to higher integration of the associative memory.