摘要:
An operation unit capable of performing round processing at a high speed in a floating point operation. A circuit for detecting an overflow on the condition of a signal representing all 1's in an output of a mantissa shifter and a signal representing round-up, a carry look-ahead circuit and a circuit for generating a round precision signal are provided. When the overflow takes place, the mantissa is produced as "1". The operation unit is compatible to single, double and extended precisions recommended by Institute of Electrical and Electronic Engineers (IEEE).
摘要:
An overcurrent protection circuit for an inverter device including three arms each composed of a pair of series connected electric gates, a junction therebetween being connected to a load and opposite ends being connected across a d.c. power source, and adapted to supply a three-phase a.c. power to the load by on-off controlling the electric gates sequentially according to on-off signals of the electric gates supplied from a control circuit. Majority logic circuitry is provided, and stress conditions in the electric gates which receive substantially a stress produced when the electric gates are turned off are detected in order to release these gates from a large stress exerted on the gates when an output short-circuit occurs. The majority logic circuitry control the sequence of turning off the electric gates so that the stress on the detected gate is reduced, to protect the gates from damage due to excess stress on the gates when the output short-circuit occurs.
摘要:
A bit slice multiplication circuit operating to slice a multiplier, produce products for the sliced multipliers and a multiplicand and sum the products to obtain the multiplication result. The circuit includes a slicing unit for slicing the multiplicand, multiplying units corresponding in number to the number of sliced multiplicands, and adding units provided in correspondence to the multiplying units and implementing summation for multiplication results from corresponding multiplying units while shifting the sliced portions of the multiplicand at each multiplying operation for sliced multipliers and multiplicands by the multiplying units, the multiplication result being obtained by summing all summation results produced by the adding units.
摘要:
Title information, which contains management information representing the kind or class of document information be recorded and index information representing the title and recording position of each document information, is provided for the recording and retrieving of the document information. When recording document information, title information is reproduced from an index information recording track of a magnetic tape and written in a title memory. A CPU executes an auxiliary decision as to if the management information of the reproduced title information corresponds to any of various management information preliminarily memorized, a first decision as to if the management information of document information newly applied from a keyboard corresponds to the various management information, and a second decision as to if the title applied from the keyboard coincides with a title in the title memory. The CPU inhibits the recording of document information at least one of the auxiliary decision and the first decision is unsatisfied and/or the second decision is satisfied.
摘要:
In a control device of an AC motor wherein a torque equivalent to that of a DC motor is created by controlling the instantaneous values of its stator current, or in a vector control device, signals from a position detector such as a resolver coupled to the AC motor are utilized to form stator current instruction signals and to provide rotation position feed-back signals and rotation speed feed-back signals for the AC motor, thereby to perform precise servo-control.
摘要:
A mobile telephone is provided that includes a plurality of circuit blocks and adapted to cut off the supply of power source voltage to any one of the circuit blocks. The mobile telephone also includes an interblock interface circuit provided on a signal path between an elected circuit block and a branch point at which the signal path branches into different branch paths so as to connect to other circuit blocks. The interblock interface circuit includes a signal gate for preventing signal transmission from the elected circuit block to the other circuit blocks, and includes a storage unit for storing a signal right before the power cut-off.
摘要:
A galvano motor 10 includes a motor shaft 1, a coil 5 which rotationally drives the motor shaft 1, and an encoder scale 6 which is joined to one end of the rotating shaft, the motor shaft 1 is configured so that a mirror 9 which is heavier than the encoder scale 6 at the other end opposite to the one end to which the encoder scale 6 is joined, a phase crossover frequency fphase in open-loop characteristics of the galvano motor 10, a torsion resonance frequency fscale between a center part of the motor shaft 1 and the encoder scale 6, and a torsion resonance frequency fmirror between the center part of the motor shaft 1 and the mirror 9 satisfy the relation of fphase
摘要:
Repeaters are arranged at arbitrary positions to substantially improve transmission speed of a signal. In the semiconductor integrated circuit device 1, repeater regions 10 where repeaters are provided as relay points for wiring are provided in the central parts of the core power source regions 2, 3 and 5, on the left side of the core power source regions 4 to 8 and at the upper and lower parts of the semiconductor integrated circuit device 1. A power switch region for repeater 11 is formed so as to surround the core power source regions 2 to 8 and the repeater regions 10. The power source lines of the reference potential connected to the repeater regions 10 are laid out at equally spaced intervals throughout the core power source regions 2 to 8, which enables the repeater regions 10 to be flexibly laid out. This permits the repeaters to be more effectively arranged, which improves the performances of semiconductor integrated circuit device 1.
摘要:
A mobile telephone is provided that includes a plurality of circuit blocks and adapted to cut off the supply of power source voltage to any one of the circuit blocks. The mobile telephone also includes an interblock interface circuit provided on a signal path between an elected circuit block and a branch point at which the signal path branches into different branch paths so as to connect to other circuit blocks. The interblock interface circuit includes a signal gate for preventing signal transmission from the elected circuit block to the other circuit blocks, and includes a storage unit for storing a signal right before the power cut-off.
摘要:
A semiconductor integrated circuit device having a control signal system for avoiding failure to check an indefinite signal propagation prevention circuit, for facilitating a check included in an automated tool, and for facilitating a power shutdown control inside a chip. In the semiconductor integrated circuit device, power shutdown priorities are provided by independent power domains (Area A to Area I). A method for preventing a power domain having a lower priority from being turned OFF when a circuit having a high priority is turned ON is also provided.