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Method for converting packet mode data from high-bit width format to low-bit width format using frame alignment

A technology for format conversion and packet realization, applied in the direction of data exchange through path configuration, etc., can solve the problem of waste of storage resources

Inactive Publication Date: 2004-01-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the 37-bit wide data is not processed and directly stored in SDRAM, considering that a storage unit of SDRAM needs at least two pieces of SDRAM in bytes, this causes a waste of storage resources, so it is necessary to perform certain operations on the 37-bit wide data. process to make it suitable for use with 32-bit wide SDRAM storage
The traditional data format conversion method can split 37-bit wide data into a 16-bit wide data and a 21-bit wide data, so that each SDRAM storage unit (32bit) can store 16-bit wide data or a 21-bit wide data Wide data, although only one piece of SDRAM can be used to complete the storage, but there is also a waste of storage resources

Method used

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  • Method for converting packet mode data from high-bit width format to low-bit width format using frame alignment
  • Method for converting packet mode data from high-bit width format to low-bit width format using frame alignment
  • Method for converting packet mode data from high-bit width format to low-bit width format using frame alignment

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Embodiment Construction

[0016] Taking the format conversion of Ethernet packet data as an example, the format conversion realizes the conversion from high-bit-width data to low-bit-width data. Such as figure 1 As shown, the general idea of ​​Ethernet packet format conversion is as follows: firstly, the input Ethernet packet is detected to be oversized, and the Ethernet packet exceeding the preset packet length is processed into a standard Ethernet packet. The standard Ethernet packet is converted into low-bit-width data through the format conversion first-in-first-out buffer (FIFO), and the SDRAM controller controls the reading and writing of SDRAM. The low-bit-width data read from the SDRAM controller is restored to high-bit after frame alignment processing Wide data, complete the data preprocessing and recovery of the flow control unit.

[0017] The data preprocessing of the flow control unit mainly includes three main processes: (1) Overlong packet detection; (2) Format conversion of Ethernet pac...

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Abstract

The invention discloses a method for realizing the format conversion of the package mode data from the higher bit wide to the lower bit wide using the frame positioning, characterized by that the method comprises, (1) conducting super-long package detection for the input package, processing the packages exceeding the preset package length into the standard package, (2) adding the package length information of the status signal of the input packages to transform them into the frame header of the lower bit wide, and storing it in the previous address of the data package header, (3) by performing frame header positioning to the lower bit wide data, recovering them into the higher bit wide data having the status information. The invention has the advantage of saving storage resource, convenient format conversion and having self-curing function.

Description

field of invention [0001] The present invention belongs to a format conversion method based on packet mode data. The so-called packet mode data includes Ethernet, asynchronous transfer mode (ATM), high-order data link control procedure (HDLC), link access procedure (LAPS), general Frame format processing (GFP) and other data that use packets as the basic unit of transmission. The format conversion method involves processing of super long packets, abnormal packets, filtering of special packets, and the use of frame positioning to realize packet-based high-bit-width data to Method for low-bit-width data conversion. technical background [0002] Packet data can usually be processed into status bits + data bits. After adding status bits, the data bit width changes, which is often not conducive to direct storage. Therefore, it is necessary to convert high-bit-width data into low-bit-width data to facilitate data storage. [0003] Taking the processing of Ethernet packet data as...

Claims

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Application Information

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IPC IPC(8): H04L12/28
Inventor 徐春石磊
Owner HUAWEI TECH CO LTD
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