摘要:
Multiprocessor system having global data replicated in all local memories, each one related to one of the system central processing units (CPUs) where consistency of the global data in each of the local memories is provided by a global write procedure according to which an agent CPUZ, willing to modify a global data in its own local memory, outputs a write command on the system bus for performing the write operation in the local memory of another destination CPU of the system and charcterizes such command as a global write, so that all the CPUs connected to the system bus (including CPUZ) detect such command, perform such write operation in their related local memory, and provide the destination CPU with a signal indicative of performed write operation, so that the destination CPU may signal to CPUZ the execution of the global write. By this procedure it is possible to use a standard system bus and inteface circuits available on the market, such as the coprocessors INTEL MPC, which require, for correct execution of the system bus protocol, the activation of both a requesting coprocessor and a replier coprocessor.
摘要:
Transparent cache memory for data processing system in which a central processing unit requests the read out of an information contained in a working memory at a current address and immediately receives, whithout waiting, the requested information from the cache memory, if the requested information contained in the cache memory and meanwhile the cache memory performs the reading and the storing into the cache, of an information contained in the working memory at the address next following the current address, so as to advance a possible subsequent request of the central processing unit. If the requested information is not contained in the cache memory, the cache memory performs a double memory read in page mode at the current memory address and at the next following address, thus minimizing the occupation times of the memory. The double reading is performed only for those addresses which allow for page mode operation.
摘要:
Printer for data processing system, the printer being for installation on a working desk, and comprising a multifunctional stand (11-15) having a generic handle form hinged to the printer body near the edge defined by the base and the rear wall, the stand being pivotable to take a non operative position, close to the base or the rear wall and at least an operative position in which the stand (11-15) is positioned below and far from the base and supports the rear portion of the printer in a position spaced apart from the working desk.
摘要:
Self adjusting phase lock circuit in which a frequency and/or phase comparator (1) compares the frequency and/or phase of a reference signal FVCO with the frequency and/or phase of a frequency or phase modulated signal RD to generate an error signal input to an integrating network (3,4), which in turn generates an error voltage related to the frequency/phase error of the two signals, said voltage being input to the control input of a voltage controlled oscillator (2) which generates reference signal FVCO as a function of the error voltage and of an adjusting voltage received at an adjusting input, wherein self adjusting means are provided consisting in a fixed reference voltage periodically input to the oscillator control input as a substitute for the error voltage, in a source of a fixed frequency signal, periodically input to the comparator (9) as a substitute for the modulated signal, in an operational network generating from the error voltage a feedback signal (VRANGE) periodically input to the adjusting input of the oscillator (2) and hold at said input by sample and hold circuits (10,11,17), so that the adjusting voltage VRANGE is periodically adjusted in automatic way to provide to the phase lock circuit an operative condition permanently close to a nominal working point, independently of thermal drift and performance spread of the used components.
摘要:
Timing unit for generating a timing signal for synchronous microprocessors (such as microprocessor 68020) in which an oscillator generates a base frequency equal to four times the timing frequency for the microprocessor, a frequency divider divides the base frequency by four and provides such timing frequency, and a shift register clocked by the base frequency and receiving in input a timing signal in output from the frequency divider, generates a mask signal,which is selectively applied to a control input of the frequency divider, depending on presence of one or more control signals, to inhibit the switching of the frequency divider thereby introducing in the phases of the timing frequency wait states equal to 1/4 (or mutliple thereof) of the timing frequency.
摘要:
Aerodynamic damper for impact printing actuator in which a movable armature (7) of a magnetic circuit has to resume, after actuation, with minimum rebounding and oscillations, a stable rest position defined by the contact of a flat surface (9) of the armature (7) with a flat surface (10) of a stop element (2), consisting in a recess (13) formed in at least one of the two flat surfaces and having peripheral side walls (14, 15) slanted as to the flat surface.
摘要:
Dual position fastener for fixing together, in removable way a closing panel to a cabinet for electronic equipment, comprising a cylindrical pin (2) and a resilient boss (1), the boss having an axial opening (3) for insertion of the pin and an annular groove (5) for fixing the boss in an opening of a cabinet wing, the wing providing a ledge for the closing panel, the pin having a threaded tong (11) with a ledge expansion for fixing to the closing panel and a cylindrical portion for insertion in the axial opening of the boss, the cylindrical portion having a diameter equal to the diameter of the axial opening and two toroidal reliefs (8, 9) having greater diameter, one at the end of the cylindrical portion, the other at intermediate position, so as to define two stable fixing positions of the closing panel to the cabinet, a first position in which the boss is located between the two toroidal reliefs and the panel is suitably spaced apart from the cabinet wing, the second position in which the boss is located between the intermediate toroidal relief and the ledge for the closing panel.
摘要:
Timing unit for generating a timing signal for synchronous microprocessors (such as microprocessor 68020) in which an oscillator generates a base frequency equal to four times the timing frequency for the microprocessor, a frequency divider divides the base frequency by four and provides such timing frequency, and a shift register clocked by the base frequency and receiving in input a timing signal in output from the frequency divider, generates a mask signal,which is selectively applied to a control input of the frequency divider, depending on presence of one or more control signals, to inhibit the switching of the frequency divider thereby introducing in the phases of the timing frequency wait states equal to 1/4 (or mutliple thereof) of the timing frequency.
摘要:
Autoprogramming pneumatic gripper for the insertion of components on printed wiring plates constituted by two jaws whose opening is controlled by a double-acting pneumatic cylinder and by a diaphragm pneumatic actuator in series to the cylinder so that the cylinder operation allows to carry out the opening/gripping of the jaws with a wide stroke and the keeping of the cylinder piston in any desired position of its possible stroke, while the diaphragm actuator operation allows to carry out openings/gripping of the jaws on the piece to be handled with very reduced strokes and without modifying in considerable way the cylinder position which, lacking further actuations, stays in an autoprogrammed position for the gripping and the release of subsequent pieces of equal size.