In this pape, pricision brushless DC motor control system based on field programmable gate array(FPGA) was designed. The system consists of two parts: FPGA and peripheral circuits. FPGA as the control core of the whol...
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In this pape, pricision brushless DC motor control system based on field programmable gate array(FPGA) was designed. The system consists of two parts: FPGA and peripheral circuits. FPGA as the control core of the whole circuit, through the hardware programming language VerilogHDL programming FPGA internal hardware circuit to complete fractional PID control algorithm, based on fractional PID control mode to achieve the appropriate duty cycle PWM output controller design. The simulation results show that the fractional-order PID controller based on FPGA has the advantages of simple structure, flexible control and strong anti-interference ability, meanwhile meets the actual requirements of motor speed regulation.
Package stacking, die stacking, wafer stacking, and device stacking are the four different types of three dimensional (3D) technology. Except for package stacking, the other three stacking techniques require special c...
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ISBN:
(纸本)9781424448869
Package stacking, die stacking, wafer stacking, and device stacking are the four different types of three dimensional (3D) technology. Except for package stacking, the other three stacking techniques require special considerations when designing circuits and systems. In this paper, different stacking techniques will first be reviewed, followed by an introduction to the possible applications for 3D circuits and systems, including sensor systems, processor-memory systems, Network-on-Chip designs, and Field-programmable gate arrays. The paper will also provide key design considerations in 3D circuits and systems, and use a sensor system as an example to summarize 3D design issues discussed.
Field programmable gate arrays (FPGAs) are preferred in the modern embedded system to accelerate the performance of the entire system. However, the FPGAs are liable to suffer from reconfiguration overheads. These over...
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Field programmable gate arrays (FPGAs) are preferred in the modern embedded system to accelerate the performance of the entire system. However, the FPGAs are liable to suffer from reconfiguration overheads. These overheads are mainly because of the configuration data being fetched from the off-chip memory at run-time and due to the improper management of tasks during execution. To reduce these overheads, two algorithms are proposed. Both the algorithms focus on the prefetch heuristics, reuse technique, and an optimal mapping of tasks over the available memories. However, in terms of reusing technique, algorithm-1 uses least recently used (LRU) policy and algorithm-2 uses the optimal replacement policy (considering the vitality of the reconfigurable units (RUs)). Simulation results are obtained for both the algorithms. It is evident from the result that most of the reconfiguration overheads are eliminated when the applications are managed and executed based on the proposed algorithms. Also, the two algorithm results are compared and analyzed. For this purpose, the experiments included smaller and larger task graphs. In the case of smaller task graphs, algorithm-2 outperforms algorithm-1 in reducing reconfiguration overheads. In larger task graphs, algorithm-1 produces better results compared to algorithm-2.
Optically reconfigurable gatearrays (ORGAs) have been developed as a type of multi-context field programmable gate array. An ORGA's programmable gate array with more than 100 reconfiguration contexts can be recon...
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ISBN:
(纸本)9781467357609
Optically reconfigurable gatearrays (ORGAs) have been developed as a type of multi-context field programmable gate array. An ORGA's programmable gate array with more than 100 reconfiguration contexts can be reconfigured in nanosecond-order. In addition to that beneficial feature, ORGAs can be reconfigured with invalid configuration data that have been damaged by high-energy charged particles in a radiation-rich space environment. Even if 35 % or 5,915 pixels of holographic memory data are damaged by high-energy charged particles, the ORGA can execute configuration operations correctly. Therefore, ORGAs are sufficiently robust devices for use in space-radiation environments. This paper presents a proposal of a more advanced dependability-increasing technique on a multi-context ORGA. This technique can raise the ORGA's level of configuration dependability even further by exploiting multi-context implementation.
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