Method for realizing universal serial transceiver

Abstract

The invention provides a method for realizing a universal serial transceiver. The baud rate of a sending end can be determined by receiving a pilot pulse sequence; the total width of the data bit of the pilot pulse sequence must be more than 16*M, the width difference of two adjacent bits (Nth bit and (Nth-1) bit, 1<=N<=M) of the pilot pulse sequence can not be more than x% (x value can be allocated) of the width of the (Nth-1) bit, if more than x%, the pilot pulse sequence needs to be received again for automatic matching connection; and the error of the accumulative bit width of a received data sequence can not be more than y% (y can be allocated) of a standard bit width. The method provided by the invention can not only enhance the anti-interference capacity of serial communications, but also have universality. In combined with a certain communication protocol controller, the universal serial transceiver can form a corresponding serial communication interface, such as a debugging interface and an asynchronous serial communication interface, achieves the effects of flexibility and high reliability and has wide application prospect.

Description

technical field [0001] The invention belongs to the field of data communication, in particular to a method for realizing a universal serial transceiver. Background technique [0002] In some communication processes, the baud rate of the input data cannot be obtained directly, so the receiver needs to determine the baud rate of the data transmission according to the characteristics of the received data. Nowadays, the basic principle of adaptive baud rate detection is mostly used: N represents a certain falling edge on the serial line, P represents the rising edge following the falling edge N, and T represents the time interval between N and P, which is equal to several data bit period. The sampling period counter starts counting from 0 at the falling edge N, and stops counting at the rising edge P. This value indicates that the serial data has a low-level clock cycle, which is equal to several data bit periods. This count value is then compared with the value stored in the ...

AI Technical Summary

Problems solved by technology

In the above design, if the difference between the minimum width of the low level and the standard bit width is too large, there will be a large error in the baud rate coefficient obtained by this method, and normal communication may not be realized.

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