Method and apparatus for phase adaption and frame alignment of serial media independent interface of ethernet network

A technology of Ethernet and frame alignment, applied in the field of communication, which can solve problems such as non-uniformity

Active Publication Date: 2014-12-31
FENGHUO COMM SCI & TECH CO LTD
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Problems solved by technology

However, if the data sources of one of the 8 channels are different, or even the data sources of the 8 channels are different, different data sources are accompanied by different timing sources, that is, the clock and SYNC pulse are different, and they must be merged into the same timing combination. Needs retiming and frame alignment

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  • Method and apparatus for phase adaption and frame alignment of serial media independent interface of ethernet network
  • Method and apparatus for phase adaption and frame alignment of serial media independent interface of ethernet network
  • Method and apparatus for phase adaption and frame alignment of serial media independent interface of ethernet network

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] For the SMII buses that are all derived from the same source of the system clock and come from different clock domains, an asynchronous FIFO (First Input First Output, first-in-first-out queue) can be used to adapt them all to the system clock domain. Note: FIFO data is combined by SMII data and SYNC, the write clock is the companion clock, and the read clock is the system clock. Since the clocks are from the same source, the read and write enable signals can always be in an enabled state without causing FIFO overflow. After they are all adjusted to the system clock domain, the method described below can be used to align the data to the system SYNC pulse of any phase.

[0023] The method for phase adaptation and frame alignment of the Ethernet serial media independent interface provided by the embodiment of the present invention includ...

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Abstract

The invention discloses a method and an apparatus for phase adaption and frame alignment of a serial media independent interface (SMII) of an ethernet network. The method comprises the following steps that: when an input synchronous pulse signal comes, clearing is carried out on a counter and the counter starts to count again; when a system synchronous pulse signal comes, a trigger with clock enablement latches a counting value of the counter to obtain a phase difference delay between the input synchronous pulse signal and the system synchronous pulse signal; with regard to input data, a shift register works out data of ten kinds of different phase time delays , wherein the data contains the input data itself; and according to the phase difference delay value, a synchronization selector selects data for output from the data with ten kinds of different phase time delays, wherein the selected data are corresponded to the phase time delay and are used as output data after phase alignment is carried out again according to the system synchronous pulse signal. According to the invention, multipath source synchronous SMII (SS-SMII) data can be synchronized to a same system clock and a same frame pulse, wherein the SS-SMII data has a same source, so that a timing combination mode of a target chip or a target module can be satisfied.

Description

technical field [0001] The invention relates to the field of communications, in particular to a method and device for phase adaptation and frame alignment of an Ethernet serial media independent interface. Background technique [0002] SMII (Serial Media Independent Interface, Serial Media Independent Interface) interface is an Ethernet media interface proposed by Cisco on the basis of MII (Media Independent Interface, Media Independent Interface). The clock frequency is 125MHz, 10 bits per frame, and SYNC (synchronization pulse, 10 bits per frame) is used to set the frame. At present, the SMII interface has become the universal serial bus standard of the Ethernet MAC (Medium / Media Access Control, Media Access Control) interface of the switch chip. [0003] According to the provider of the timing source, the SMII interface is divided into two types: system synchronous SMII interface and SS-SMII (Source Synchronous SMII, source synchronous SMII) interface, see figure 1 and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/70H04L7/00
Inventor 林雪章灿辉
Owner FENGHUO COMM SCI & TECH CO LTD
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