Troubleshooting Eye Diagram Failure Issue with DP83822I in Fiber Optic Schematic
Utilizing the Tektronix MSO 70404C oscilloscope and differential probe for testing, the customer encounters failure in the eye diagram test with the DP83822 IC. Suggested solutions from the BU and potential configuration of Reg0x0027 register in DP83822I to meet the eye diagram test requirements are explored.
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Eye diagram failure issue with DP83822I Date: Aug.05,2024
Schematic B fiber Optic
Test ways 1.Customer doesn t use the test way recommended by oscilloscope vendor because customer has not purchased Ethernet-specific test fixtures, the way is shown as below. 2. Customer currently uses below way to do eye-diagram test. Test instrument Tektronix MSO 70404C (4GHz25 GS/s) The PC pings the board and there is no dropping packets, Then use the oscilloscope differential probe to test the relative receiving eye diagram of the MDI. differential probe Test results with #2 test method 1. With competitor ICs, such as YT8512, it can pass the eye diagram test, no anomalies are seen. 2. With DP83822, eye diagram test is failure. The test report is attached.
Questions: 1. Need BU help to give some suggestion about customer test results. 2. To implement an eye test, Should customer configure Reg0x0027 register in DP83822I to meet the eye diagram test?
