摘要:
A data transfer system comprises a plurality of terminals; a plurality of high-speed data transfer units connected to the terminals through a network, each data transfer unit comprising a plurality of storage devices and a storage device group control device or unit for controlling readout of data from the storage devices, and dividing and storing data requested by the terminals; a virtual storage device group controlling device or unit for controlling readout of data from virtual storage device groups, each virtual storage device group being constructed by selecting a storage device from each high-speed data transfer unit; and an instruction conversion unit or device for receiving a data readout instruction on the basis of data requests output from the terminals, which instruction is given to the virtual storage device groups, from the virtual storage device group control unit or device, and converting the instruction into a data readout instruction to the storage devices from the storage device group control unit or device. In this data transfer system, the load for the data transfer processing is equally distributed among the high-speed data transfer units even when data transfer requests are output from plural terminals.
摘要:
A transfer-target unit outputs commands for data reading and data writing. An address generator generates control signals in accordance with the commands, and outputs the number of bytes of data first transferred by read access. A command generator generates control commands in accordance with the control signals to control an SDRAM. At this time the command generator judges the number of transferred bytes to control so that the SDRAM executes instructions in order from an instruction which is the most efficient in data transfer. That is, in the case where data is read across a bank boundary, the command generator judges which is to be executed first between read processing in a bank 0 and active processing in a bank1, to control the SDRAM. A data processor mediates data transfer between the transfer-target unit and the SDRAM in accordance with the control commands. In this way, it is possible to issue commands so as to terminate data transfer in the minimum number of cycles in the case where data read processing is continuously performed to different banks. The number of cycles required for two continuous access (access to the bank 0 and the bank 1) can be thus reduced, thereby increasing effective transfer rates of the SDRAM.
摘要:
A memory control device having a plurality of data transfer paths including a storage device group comprising a plurality of storage devices for storing data and a buffer memory group comprising multiple buffer memories for storing transferred data, dividing files into multiple blocks for storing blocks in multiple storage devices on different data transfer paths, and executing control to read data from the storage device to be output with a request from a connected terminal to the buffer memory wherein storage devices on different paths create multiple virtual storage device groups, and buffer memories create virtual buffer memory groups. The memory control device comprises a data output control for executing control in a first cycle, the data being temporarily dividedly stored in a prescribed virtual storage device group. In a second cycle the device outputs data stored in the virtual buffer memory group and by alternately repeating first and second cycles, data read from the plural virtual buffer memories group is switched.
摘要:
In a data transfer system in which when a first to fourth terminals require reading data, the data are read out of a first to fourth storages to be stored in a first and second buffer memories while a first and second virtual groups of storages are alternately switched every constant cycle, and thereafter a first and second data sending units send the data stored in the first and second buffer memories to the terminals; on the other hand, when the first to fourth terminals require writing data, received data is divided in a way to distribute the process loads of data read and data write of the divided data equally into a first and second data transfer units. At the same time, the data are stored in the first and second buffer memories of the first and second data transfer units, and thereafter the data are written into the first to fourth storages while switching the first and second virtual groups of storages alternately. As a result, the load of transferring data to the terminals is not concentrated on a particular data transfer unit in the data transfer system, even when the rate of request-to-reads from the terminals changes or differs from those of others.
摘要:
There is provided a new glow plug that can be easily determined as to whether or not it is a new article.An additional circuit 12 formed by connecting a diode 13, a fuse 14, and an adjusting resistor 15 in series in this order is connected in parallel to a heating element 11 of a glow plug 1. The diode 13 is provided so as to have an anode located on the positive electrode side of the heating element 11 and a cathode located on the fuse 14 side. In the case of a unit inspection, by applying a positive voltage for test to a heating element negative electrode connecting portion 3a, it is possible to determine whether or not the glow plug 1 is normal without blowing the fuse 14 before the glow plug 1 is used in a vehicle.
摘要:
To suppress current fluctuations upon commencement of driving and prolong lifespan by reducing electric stress caused by current fluctuations.A glow plug 1, a glow switch 2, and a stabilizing coil 3 are series-connected, and upon commencement of the driving of the glow plug 1, a repetition frequency of PWM signals that control the opening and closing of the glow switch 2 is made into a higher frequency than a repetition frequency in a normal drive state and the opening and closing of the glow switch 2 is controlled (S104), and when a predetermined drive shift condition has been met (S106), the repetition frequency of the PWM signals is returned to the frequency during normal driving and the opening and closing of the glow switch 2 is controlled (S108), whereby the current upon commencement of driving is smoothed and the occurrence of an instantaneous large current is suppressed.
摘要:
A semiconductor memory device includes first and second driving transistors; first and second load transistors; and first and second transmission transistors. Their respective drain diffusion layers of the transistors are isolated from one another. The semiconductor memory device also includes a bit cell in which the first and second driving transistors, the first and second load transistors, and the first and second transmission transistors are arranged; a first wiring for connecting their respective drains of the first driving transistor, the first load transistor, and the first transmission transistor; and a second wiring for connecting their respective drains of the second driving transistor, the second load transistor, and the second transmission transistor.
摘要:
A semiconductor memory device includes first and second driving transistors; first and second load transistors; and first and second transmission transistors. Their respective drain diffusion layers of the transistors are isolated from one another. The semiconductor memory device also includes a bit cell in which the first and second driving transistors, the first and second load transistors, and the first and second transmission transistors are arranged; a first wiring for connecting their respective drains of the first driving transistor, the first load transistor, and the first transmission transistor; and a second wiring for connecting their respective drains of the second driving transistor, the second load transistor, and the second transmission transistor.
摘要:
A processing apparatus includes a sealed vacuum chamber which contains a processing portion; a pressure controlling system which keeps the internal pressure of the sealed vacuum chamber constant at a predetermined level by exhausting the ambient gas in the sealed vacuum chamber; and an ambient gas recirculating system which recirculates the ambient gas exhausted from the sealed vacuum chamber back into the sealed vacuum chamber; wherein the ambient as recirculated by the ambient gas recirculating system is blown into the sealed vacuum chamber so that a gas flow is generated in a predetermined direction along the processing portion.
摘要:
A packet recording/reproducing system is provided which records or reproduces packets on or from tracks formed in time sequence on a magnetic tape. In a recording operation, the packet recording/reproducing system adds to input packets time stamps whose values are synchronous with packet arrival time control clocks produced by the system. The timing with which the packets are recorded on the magnetic tape is controlled by the arrival time control clocks so that a given number of the packets inputted at high data rate are recorded within a one-track area, a two-track area, or a one-track over area defined across at least two of the tracks, thereby minimizing the loss of capacity of the magnetic tape.