Force sensor from interlink that use square pad forforce sensing is useful for many applications, as the resolution of this sensor continues and FPGA is digital, an ADC is required to deal with such sensor and as the embedded ADC of Spartan 3E kit need complex signals synchronization to work.This paper present a hardware design and optimized implementation based VHDL coding of control unit that make the ADC of Spartan 3E kit operate in real time. The system use Moore states machine style for generating ADC synchronization signals. Also, the result observed via new approach, which is instead of using chip scope for displaying values of ADC, LabVIEW FPGA environment is used so it"s possible to display result on PC via USB. The control is optimizedand efficient due to using only 1% of FPGA chip and the measured force can be displayed in real time and the proposed control unit can be work as standalone or coprocessor architecture.
General TermsFPGA, VHDL, LabVIEW FPGA, Force, Sensor.
Most of the traditional digital implemented systems uses fixed point or floating point for representing and processing data. An alternative approach is to represent data as random bits that are distributed along the sequence. To be precise, stochastic logic can be considered as a solution for hardware size for application that consume physical area like neural networks as it uses logic gates to implement complex operations and its inherits resistance to bit flips noise. To avoid some of the problems that this type of processing suffers from, a combination of stochastic logic and classical logic (fixed point) is used to implement a neural networks (Fully connected feed-forwards) that is characterized by FPGA large size consuming. The stochastic logic is utilized have to implement part of the multiplication operations in the hidden layers of network and LFSR is used as a random generator for conversion of weights and activation functions outputs. The hardware utilization of Spartan 3E-500K FPGA results are compared with another network of the same size. A discussion of some of the issues that related to this methodology faces is also presented.
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