A method for realizing SDH adaptation to Ethernet rate with logic

Abstract

The method comprises: at SDH data receiving side, the received data is firstly buffered into the on-chip RAM corresponding to the SDH channel; when the buffered data can meet the quantity of once data burst written-in, the SDH data receiving side sends the request for accessing the out-chip RAM, and selects a channel, having access request, whose in-chip RAM has highest data quantity as the channel with highest priority to get the access right to the out-chip RAM.

Description

technical field [0001] The invention belongs to the field of microelectronics and relates to digital integrated circuit design technology, SDH and Ethernet technology. Background technique [0002] SDH is the English abbreviation of Synchronous Digital Hierarchy, which is the optical synchronous digital transmission network. Ethernet is a local area network that uses a shared access scheme called carrier sense multiple access / collision detection. The digitized data is loaded into the virtual container of SDH for transmission via optical fiber. The data transmission rate varies depending on the size of the virtual container. The transmission rate is as small as 1.664Mbit / s or 2.240Mbit / s, as large as 150.336Mbit / s or even higher s speed. [0003] The mainstream rate of Ethernet currently in use is 100Mbit / s or 1000Mbit / s, and the rate of some earlier devices is 10Mbit / s. The data transmission rates of the two are different, and a store-and-forward mechanism is obviously ne...

AI Technical Summary

Problems solved by technology

[0006] 1. The adaptation of multiple SDH cascaded data channels to a single Ethernet port is not realized;

[0007] 2. When using off-chip RAM, the channel average round-robin mechanism is used, resulting in low efficiency

[0008] When using off-chip RAM, the burst read and write method is not used, resulting in low RAM access efficiency

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