Method and device for achieving backboard auto-negotiation function by means of high speed Serdes

Abstract

The invention provides a method and device for achieving a backboard auto-negotiation function by means of a high speed Serdes. The method comprises steps of obtaining a sampling multiple N according to the communication rate of an AN and the transmission rate of the Serdes; selecting a parallel interface bit width M which the Serdes supports with the value of the parallel interface bit width M being smaller than the value of the sampling multiple N; making N copies of sent data in the sending direction of the data, and sequentially transmitting the N copies of the sent data into a transmission channel; obtaining one of the N copies of each data from the transmission channel in the receiving direction of the data, and outputting the copy of each data to the AN. According to the invention, in the sending direction of the data, the data is copied, in the receiving direction of the data, a sample of the data is taken, furthermore, on the premise that the high speed Serdes communication mode is not changed, the method supports a plurality of combinations of the Serdes transmission rate and the parallel interface bit width, the AN reuses the high speed Serdes connected with a PCS, auto-negotiation between two devices is achieved, the degree of participation of system software is reduced, the hardware expense is reduced, and the manufacture and usage cost is saved.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a method and a device for realizing a backplane auto-negotiation function by using high-speed Serdes. Background technique [0002] IEEE802.3ap defines auto-negotiation for the backplane, so that Ethernet devices with different transmission rates connected through the backplane can select the highest rate supported by each through auto-negotiation. [0003] Such as figure 1 As shown, it introduces the framework diagram of implementing AN in the PHY. For example, the Ethernet device PHY in this example supports 1G / 10G / 40G rates at the same time. If it is connected to a device that also supports AN, the two devices will pass through during initialization. The respective AN modules send their own capabilities in DME encoding, and at the same time decode the capabilities sent by the peer. When both ends can negotiate the same highest rate (such as 10GBase-R), they will each send...

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Problems solved by technology

[0005] In the prior art, for the baud rate of 312.5Mhz during AN communication, because the high-speed Serdes cannot support this rate, usually, the transmission rate supported by the high-speed Serdes will be higher than the communication rate of the AN, so, as figure 1 As shown, an additional low-speed Serdes is required for serial-to-parallel conversion, which increases the cost of hardware implementation and the complexity of system implementation.

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