High-reliability serial transmission processing method and device for programmable hardware

Abstract

The present invention provides a high-reliability serial transmission processing method which is suitable for the programmable hardware and the device, which includes a receiving port, a receiving control module and a controlled receiving module, the receiving control module scans the prescribed number n of the receiving port in each receiving period and defines the interval between each scanning as one scanning period; judging whether the value of current receiving port has changed after the completion of each scanning; and the receiving module receives one bit information from the receiving port when the triggering signal of the receiving control module is received. The invention can settle the problem of wrongly receiving caused by the disaccording of the crystal vibration between the receiving and transmitting equipment; can settle the problem of wave distortion at the receiving end caused by the transmission medium and the transmission circuit and increases the reliability of the communication.

Description

technical field [0001] The present invention relates to the field of transmission between two devices through a medium such as an optical fiber, etc., with a method of serial communication. The phase shift caused by the influence of the waveform distortion caused by the communication medium reduces the communication reception processing method that requires the communication transceiver circuit. Background technique [0002] The serial communication technology has been widely used in the industrial field because of its simple equipment and convenient implementation. A branch of its field, optical communication, is especially suitable for use in places with strong electromagnetic interference because of its strong anti-interference and long transmission distance. However, there are two problems in the existing serial communication technology: the first problem is that the sending and receiving equipment uses different clock crystal oscillators, and the phase shift of the rec...

AI Technical Summary

Problems solved by technology

However, there are two problems in the existing serial communication technology: the first problem is that the sending and receiving equipment uses different clock crystal oscillators, and the phase shift of the receiving and receiving bits is caused by the existence of the crystal oscillator period error; The clock crystal oscillator of device B is slow, and both sending device A and receiving device B transmit and receive at the same baud rate; as time goes by, the sending point of sending device A will be slower than the receiving point of receiving device B slow back

Similarly, when the crystal oscillator of the sending device A is faster than that of the receiving device B, at a certain point in time, the bit sent by the sending device A will have no receiving point on the receiving device B.

Given the setup and hold time requirements for receiving data, this often results in false receipt

If the problem occurs precisely during the transfer of data, the transfer will produce wrong results

The second problem is that for some communication media (such as optical fiber), the high and low level duty cycle distortion caused by the characteristics of the medium itself, see Figure 1, for example, for 1521 / 2521, if you use its standard circuit Send 0101 at an interval of 200ns, the low level time of the receiving end takes up 230ns, and the high level time only takes 170ns

However, because there are errors in the parameters of the analog circuit, and the duty cycle is related to the characteristics of the transmission medium (such as the length of the optical fiber, the process, etc.), the revision accuracy is not high; it is often necessary to assist in reducing the transmission speed to ensure a certain transmission. precision

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