So we are using the SGMII version of the WGI210 device in a specific way to receive data. We connect a Marvell 88Q2112 PHY, via a TI MUX and a TI CML buffer to the WGI210IS Serdes inputs. I have attached a sample schematic of the components involved in this link. We have discovered that after some time (typically a couple of weeks) some of our WGI210 devices seem to break permanently (specifically the SERDES receive channel). We know this is broken permanently because we have removed the device and placed it on another of our working boards and the link still seems to be broken. Before it breaks, the link works 100%. We have run tests for several days over this link at full gigabit bandwidth and 0 packets are lost. When the device breaks the I210 will receive no packets typically, but we have also seen in some cases that bursts of packets come through but they are all reported as errors. We are assuming that electrically the SERDES receivers are breaking. However, the I210 datasheet does not give any indication of how they work electrically, only that they are compliant to SGMII interfaces. We have used this design with other MACs and PHYs with no failures, but it seems that the I210 is sensitive to these outputs. In the schematic I have noted that the design outputs a 550mV peak-peak signal, but in an attempt to fix the problem I have reduced the amplitude to 360mV to match the I210 outputs. I can only assume that the I210 outputs indicate what the I210 needs, but I have no information on these inputs. I have been tested this design with 360mV for a few days now with now failures, but this doesn't mean it could fail in the future. So please could you help us with a few questions : 1. What exactly is required electrically by the I210 SERDES receive channels? 2. Could you suggest where the problem could be or how we can debug this issue? 3. Could you suggest another SGMII buffer that has been used with the I210 successfully? 4. Is there something in the design that we can change to fix the issue? Thank you and regards
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