Device and method for encoding conversion from thermometer code to binary code based on fpga

Abstract

The embodiment of the invention discloses a device and a method for converting codes from thermometer codes to binary codes based on an FPGA. According to the method, the logical resources of a basic lookup table (LUT) in the minimum resource unit of an FPGA chip are used in a combined way, the thermometer codes are segmented by use of a window moving bit by bit so as to obtain a plurality of window values, and truth-values corresponding to the window values are orderly arranged to obtain one-hot codes corresponding to the thermometer codes, and then bubbling error correction is realized. Meanwhile, during encoding from the one-hot codes to the binary codes, the encoding algorithm is global logical OR operation or global logical AND operation, and the circuit of the encoding algorithm is realized by use of a pipeline architecture in combination with the logical resources of the basic LUT of the FPGA. The method is significant for improving the integrity of a digital processing system designed and realized based on the FPGA, and has an important application value.

Description

technical field [0001] The invention belongs to the field of FPGA digital circuit design, and in particular relates to an FPGA-based coding conversion device and method from thermometer codes to binary codes. Background technique [0002] The digitization of physical quantities generally involves converting the physical quantity into an intermediate digital code word by a certain mechanism, and then converting the intermediate code word into a binary code (B: Binary Code) output by digital coding technology. A common intermediate digital codeword is thermometer code (TM: Thermometer Code), and encoding the thermometer code into binary code (TM2B) is a necessary component of this type of digitizer. For example, a flash analog-to-digital converter (Flash ADC), using a resistor chain to form 2 N - 1 equally spaced reference voltage, via 2 N - 1 comparator is compared with the input analog voltage signal to be converted at the same time, and the output result of the comparator...

AI Technical Summary

Problems solved by technology

Since the FPGA chip is composed of pre-defined logic resources with a fixed structure, transferring the existing TM2B coding technology directly to the FPGA will generally result in a waste of FPGA logic resources or a reduction in execution efficiency; Utilizing FPGA resources, increasing the integration level of user-specific digital systems is detrimental, which in turn results in lower performance of the digitizer

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