Data frame positioning method and device

Abstract

The embodiment of the invention provides a data frame positioning method and device. The method mainly comprises the following steps: allocating a frame fixing state machine to each byte of the data stream in the current initial period, wherein the frame fixing state machines search for data frames from respective corresponding bytes respectively, and obtain multiple data frame search results; and selecting one of the multiple data frame search results according to the data frame search result in the previous clock cycle as the data frame search result in the current clock cycle. According to the embodiment of the invention, as each frame fixing state machine starts searching for one data frame from the respective corresponding byte, multiple data frames encapsulated in the data stream in the current clock cycle can be quickly searched, and the data frames encapsulated in the data stream in the current clock cycle can be accurately positioned.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a data frame positioning method and device. Background technique [0002] With the integration of communication networks, the intercommunication and interconnection between optical transport network, IP network and other networks has been widely used. When the optical transport network is used as the physical layer network of another network, the data of the other network must be encapsulated in a certain format, and the most commonly used encapsulation form is GFP (Generic framing procedure, general framing procedure) encapsulation. [0003] Commonly used GFP encapsulation is mostly used in 1G-10G low-rate streams, so its maximum encapsulated data bit width is 64 bits. However, with the rapid development of the network, the encapsulated data streams range from 40G to 200G. At this time, the data bit width becomes 128 bits to 512 bits. For these high bit width data...

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Problems solved by technology

[0007] In the process of realizing the present invention, the inventor found that the method for frame alignment of GFP frames encapsulated within one clock cycle in the prior art has at least the following problems: since the time of one clock cycle is very short, the set time The search time corresponding to the clock cycle is also very short

The above-mentioned framing state machine starts to search from the first byte of the data stream in this clock cycle, if the above-mentioned first byte is not the start byte of the GFP frame, and more than one byte is encapsulated in this clock cycle data frame, this method may not be able to find the correct start byte of the GFP frame, and cannot locate the GFP frame encapsulated in the data stream in this clock cycle

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