摘要:
A method for determining a layout which passes testing for electrostatic discharge in a semiconductor device, includes extracting an electrostatic discharge protection network including pads, nets and protective elements; setting start pads and end pads in the electrostatic discharge protection network; finding inter-pad voltages between the start pads and the end pads and electrostatic discharge current paths from the start pads to the end pads; grouping together the electrostatic discharge current paths in the same order; calculating estimated values of electrostatic discharge withstand voltages between the start pads and the end pads and groups to which the start pads and the end pads belong using a negative correlation between the inter-pad voltages and corresponding electrostatic withstand voltages; and determining whether the layout passes testing regarding electrostatic discharge.
摘要:
An electrostatic discharge analysis method includes extracting the pads from an input layout of the semiconductor integrated circuit; extracting the nets connected to the extracted pads; extracting the protective elements connected to the extracted nets; forming connection nodes that connect the pads or the protective elements to the nets; extracting for each net, distributed resistances that distribute along the net; connecting the distributed resistances to the connection nodes in place of the nets; forming inter-resistance nodes between the distributed resistances; and calculating an inter-pad voltage when flowing electrostatic discharge current between the pads.
摘要:
A technique for effectively attenuating EMI noise, which is generated from the electric power system of semiconductor devices, is described. In accordance with the technique, a power supply netlist with an additional electric current source(s) is generated by adding block power supply current waveform data, as extracted from test vector data and a block netlist, to the power supply netlist as extracted from the layout data of the circuit under analysis. A circuit simulation of the power supply netlist with an additional electric current source(s) is then performed in order to calculate power supply current/voltage waveform data. Furthermore, current/voltage spectral data is calculated by the Fourier transformation of the power supply current/voltage waveform data followed by displaying the current/voltage spectral data as the result of the Fourier transformation.
摘要:
The speed increasing and accumulating conveyor chain of the present invention can convey a conveyed object faster than the running speed of the chain, and keep the conveyed object stopped while continuously running the chain itself. The load roller with a larger diameter and the running roller with a smaller diameter are coaxially and rotatably mounted on the connecting pin, which is secured to the link plate, respectively. The frictional material is mounted on the load surface of the load roller, wherein the frictional material provides the load surface of the load roller with a larger frictional force than that of rotatable surface between the load roller and the running roller.
摘要:
There is provided a method for analyzing a jitter of a clock flowing in a clock path inside a semiconductor integrated circuit. Elements, which belong to any clock domains except for a selected clock domain among operation scenario information, are brought into a halting state, to create a domain operation scenario. Using the domain operation scenario, a power-supply noise analysis is performed on a clock used in the selected clock domain for a period of one to several cycles, to obtain a domain power-supply noise waveform. The obtained waveform is repeatedly connected, to create a cyclic waveform. Part of the cyclic waveform is halted, to obtain a processed domain power-supply noise waveform. The processed domain power-supply noise waveform obtained with respect to each clock domain is superimposed, to create a power-supply noise waveform. Based on the created waveform, a jitter of the clock flowing in the clock path is calculated.
摘要:
A semiconductor integrated circuit electrostatic discharge analysis apparatus includes a resistance network generation unit generating a resistance network served as a power supply interconnect equivalent circuit in a logic cell region of a semiconductor LSI circuit based on pitch, width and a sheet resistance of a power supply interconnect; a protection network generation unit generating an electrostatic discharge protection network with pads and protection elements placed in an I/O cell region of the changing semiconductor LSI circuit, connected to the resistance network; and an analysis unit calculating an inter-pad voltage between the pads when electrostatic discharge equivalent current flows between the pads.
摘要:
A method for performing compaction of a layout of a semiconductor integrated circuit designed in a hierarchy is described. The compaction of the layout is carried out by repeating a single level compaction process for compacting cell layouts in one of the hierarchical levels from a lowest level to a highest level of the hierarchical levels. The single level compaction process comprises a first replacement step of replacing lower level cell layouts in a current level cell layout with abstract cell layouts having the same profile and the same positions of terminals to be connected to the current level cell layout as the lower level cell layouts have in advance of compaction. The compaction of the current level cell is performed under a constraint that the relocations of the terminals of the current level cell layout after compaction from the original positions before compaction are possible within prescribed ranges. After compaction, the abstract cell layouts is replaced by the lower level cell layouts.
摘要:
A nitrile group-containing, highly saturated copolymer rubber is disclosed, the copolymer chain of which is comprised of (1) 5 to 40% by weight of units of an unsaturated nitrile monomer, (2) 1 to 80% by weight of units of a monomer selected from a fluorine-free unsaturated carboxylic acid ester monomer and a fluorine-containing vinyl monomer and (3) up to 20% by weight of units of a conjugated diene monomer, with the balance being (4) units of a hydrogenated conjugated diene monomer, wherein the sum of the contents of the monomer units (1) and (2) is 30 to 90% and the sum of the contents of the monomer units (3) and (4) is 10 to 70% by weight. This copolymer rubber results in a rubber composition having an improved cold resistance.
摘要:
A method for determining a layout which passes testing for electrostatic discharge in a semiconductor device, includes extracting an electrostatic discharge protection network including pads, nets and protective elements; setting start pads and end pads in the electrostatic discharge protection network; finding inter-pad voltages between the start pads and the end pads and electrostatic discharge current paths from the start pads to the end pads; grouping together the electrostatic discharge current paths in the same order; calculating estimated values of electrostatic discharge withstand voltages between the start pads and the end pads and groups to which the start pads and the end pads belong using a negative correlation between the inter-pad voltages and corresponding electrostatic withstand voltages; and determining whether the layout passes testing regarding electrostatic discharge.
摘要:
A semiconductor integrated circuit electrostatic discharge analysis apparatus includes a resistance network generation unit generating a resistance network served as a power supply interconnect equivalent circuit in a logic cell region of a semiconductor LSI circuit based on pitch, width and a sheet resistance of a power supply interconnect; a protection network generation unit generating an electrostatic discharge protection network with pads and protection elements placed in an I/O cell region of the changing semiconductor LSI circuit, connected to the resistance network; and an analysis unit calculating an inter-pad voltage between the pads when electrostatic discharge equivalent current flows between the pads.