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Part Number: TUSB1064
Our customer used the TUSB1064EVM with Dell XPS15 9550, But no DP Alt mode output.
The DA400.Zip file is used DPA-400 read data, 20190103-source.bin.html is MUX side, 20190103-sink.bin.html is after MUX.
The Good NB Waveform.Zip File is used other NB waveform, But Dell XPS15 9550 no waveform.
Could you give us a suggestion?
DA400.zipGood NB Waveform.zip
In reply to Hugo Liu:
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In reply to David (ASIC) Liu:
Please remove the 1M.
Below is an AUX channel block diagram.
On the AUXP, we have 100k pulldown on the source side and 1M pullup on the sink side, results in ~0.3V common mode voltage on AUXP.
On the AUXN, we have 100k pullup on the source side and 1M pulldown on the sink side, results in ~3V common mode voltage on AUXN.
The 1M resistor in TUSB1064 assumes we are dealing with a DP compliant source.
Looking at the previous common mode voltage measurement results, it looks like we are dealing with a non-compliant DP source . The 100k pullup/pulldown on the source side is missing or populated with resistor weaker than 1M resistor.
By adding 100k on AUXP/AUX on TUSB1064, we basically make the 100k resistors to be the strong resistor when comparing against 1M resistor, therefore correctly set the common mode voltage for both AUXP and AUXN.
On a compliant DP system, we would have two 100k pulldown/pullup, the two combined 100k pulldown (50k) would still be strong when comparing against 1M resistor. AUXP common mode voltage would be around ~0.157V and AUX common mode voltage would be around ~3.143V, still within AUXP/N common mode spec requirement. It looks the latest measurement is backward, would you please check again?
Again, the 100k is a workaround solution for non-DP compliant system. The fix needs to be on the source side to make it to be compliant.
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