Modified Xilinx FPGA power-on reset circuit
An improved technology of power-on reset, which is applied in the field of power-on reset circuit system, can solve the problems of different time delays of reset signal lines, time errors of power-on reset, and inaccurateness, etc., and achieve improved signal quality, accurate reset time, The effect of improving stability
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[0023] image 3 Shown is the schematic diagram of the FPGA power-on reset circuit of the present invention, where the PROM uses the XCF16P of Xilinx Company, and the FPGA uses the Virtex-II series XC2V3000 of Xilinx Company. In the system design, the circuit design delays the DONE signal through the RC and passes the Schmitt trigger and inverter as the global reset input of the software, which is the MRST signal in the abstract diagram. The hardware design mainly considers the requirement that the power-on reset delay is greater than 10ms. The resistance value in the RC delay reset circuit can be 4.7K ohms. In order to improve the voltage resistance of the capacitor, two 22uF tantalum capacitors are used in series, and the positive To a Schmitt trigger with a threshold voltage of 3v, the rise time of the reset signal (time from 0 to 3v) can be calculated by the RC delay formula, such as formula (1), which is about 100ms. In this way, the low-to-high transition time of the globa...
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