Baud rate generator, communication equipment and Baud rate clock signal generation method

Abstract

The embodiment of the invention provides a Baud rate generator, communication equipment and a Baud rate clock signal generation method, and relates to the technical field of data communication. The Baud rate generator comprises a subtracter, a comparator and a processing unit. The subtracter and the processing unit are electrically connected with the comparator. The subtracter calculates a difference value between a denominator value and a molecular value of a pre-configured score. The processing unit calculates a complement code of the difference value according to the difference value. The comparator controls the processing unit to select the complement code of the molecular value or the difference value as the data to be processed according to the current accumulated value and the difference value. The processing unit accumulates the current accumulated value and the to-be-processed data under the control of the system clock signal to obtain a new accumulated value and outputs the new accumulated value to the comparator, so that the comparator takes the new accumulated value as the current accumulated value. When the current accumulated value is larger than or equal to the difference value, the comparator generates a Baud rate clock signal with the frequency being the preset frequency, and therefore the Baud rate clock signal is generated through a pure fractional frequencydivision method.

Description

technical field [0001] The invention relates to the technical field of data communication, in particular to a baud rate generator, a communication device and a method for generating a baud rate clock signal. Background technique [0002] With the development of communication technology, the application of serial communication has been very extensive. Serial communication refers to a communication method for bit-by-bit data transmission between peripherals and computers through data signal lines, ground lines, control lines, etc. The baud rate is one of the most important parameters in serial communication. It is used to measure the symbol transmission rate. The baud rate clock signal can be converted by the baud rate generator according to the input system clock, but when the system clock is not designed for baud When the rate generator is set, that is, when the frequency of the system clock signal is not an integer multiple of the frequency of the required baud rate clock s...

AI Technical Summary

Problems solved by technology

The baud rate is one of the most important parameters in serial communication. It is used to measure the symbol transmission rate. The baud rate clock signal can be converted by the baud rate generator according to the input system clock, but when the system clock is not designed for baud When the rate generator is set, that is, when the frequency of the system clock signal is not an integer multiple of the frequency of the required baud rate clock signal, the baud rate generator needs to use fractional frequency division, otherwise the baud rate generator is divided according to the system clock frequency The obtained baud rate clock signal will have a large deviation

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