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TUSB564: We use TUSB564 as DP sink device re-driver. It have a performance issue.

zeng yifeng
Prodigy 10 points
Part Number: TUSB564
Other Parts Discussed in Thread: TUSB1064

We use TUSB564(TUSB564IRNQT) as DP sink device re-driver. It have a performance issue. The output frame can not higher than 40frame @4K.
Our schematic is the picture "schematic.jpg".
The chip mark is the picture "device marking.jpg".
In test mode, input/output waveform is the picture "input_output.jpg".
Below is the question:
1.We read the register from the TUSB564 address 0x00~0x07. value is the following:
00=54 ;
01=55 ;
02=53 ;
03=42 ;
04=31 ;
05=30 ;
06=36 ;
07=34 ;
The ASCII is "TUSB1064",Does it means the assembling chip is TUSB1064 ?
2.Could the TUSB1064 replace TUSB564?
3.Through TUSB564 the signal wave become worse,How to change the configuration of TUSB564 to reslove the problem?

  • 0
    TI__Guru**** 178046 points

    Hi, 

    What is the resolution you are trying to support?

    Depending on the resolution, the bandwidth and Scalar supported data rate, you may need to enable all 4 DP lanes across the USB Type-C interface.

    For example, if the Scalar max data rate is 5.4G and the resolution is 4k@60Hz, then the total bandwidth is 17.82Gbps and you need to enable all 4 lanes to support this resolution (5.4G x 4 = 21.6Gbps).

    If it is a signal integrity issue, you can tune the TUSB564 DPEQ0/1 to see if there is a performance improvement.

    The TUSB564 and TUSB1064 both support DP1.4 8.1Gbps, the difference is in USB supported data rate (5G -> TUSB564, 10G -> TUSB1064). You can use either one for the DP application.

    Thanks

    David