Transmission convergence sublayer circuit of receiver for asynchronous transmission and its operation method

Abstract

A transmission convergence sublayer circuit of a receiver for asynchronous transmission and an operation method thereof, the circuit is coupled between a buffer and a deframer. The data framer sends a data flow enable signal and a data flow to the circuit, and the circuit uses a data processing pipeline to receive and temporarily store the array byte data in any cell under the permission of the data flow enable signal , and use a header error check register to receive byte data at the same time, search for the header, and use an idle cell identifier to confirm whether the cell is a non-idle cell; when the header is found, and it is a non-idle cell After the free cell, use an anti-scrambler to obtain the payload data of the cell from the data processing pipeline, and perform anti-scrambling after obtaining the data amount enough to reach one word of data, so that it can be processed in a minimum Waiting time, output one word of data to the buffer. In addition, this circuit also has the function of automatic correction when a data error occurs in the header, so that the receiving circuit can continue to perform the receiving function smoothly.

Description

technical field [0001] The present invention relates to a circuit of a receiver for asynchronous transmission and its operation method, in particular to a transmission convergence sublayer circuit of a receiver for asynchronous transmission and its operation method. Background technique [0002] In a communication system, data is sent from the transmitting system to the receiving system through the transmission medium. Usually the transmitted data is composed of several layers according to a specific communication protocol, and the receiving system follows this specific communication protocol to process the received data layer by layer. In all communication protocols, the lowest layer is called the physical layer (Physical Layer), and in the asynchronous transfer mode (Asynchronous Transfer Mode), the physical layer is subdivided into two units, which are the physical medium sublayer ( Physical Medium) and Transmission Convergence Sublayer. [0003] The data format processe...

AI Technical Summary

Problems solved by technology

[0010] However, the descrambling of the payload in the cell, and the reshaping of the data format from bytes to words or double words (Double Words), which are output to the buffer to wait for the processing of the upper unit, etc., must be increased. post-stage circuit to complete

In this way, to complete the synchronous reception of data, check the header, anti-scrambling and data format reformation, etc., it must be completed by the circuit in Figure 2B and the subsequent circuit, which will make the circuit structure very complicated, and by Figure 2B The circuit and the post-stage circuit process the work to be done step by step, which will increase the time spent on processing.

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