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SN65DSI86-Q1: Please help with configuration of SN65DSI86-Q1 for display panel Sharp LS315M7JX01

Lukas Cepec
Prodigy 10 points
Part Number: SN65DSI86-Q1

Please yould you help us with configuration of SN65DSI86-Q1 for display panel Sharp LS315M7JX01?

Thanks very much.

  • 0
    TI__Intellectual 1205 points

    Hi Lukas,

    Please reference this FAQ for help with configuring the DSI86-Q1 registers: https://e2e.ti.com/support/interface-group/interface/f/interface-forum/945404/faq-sn65dsi86-how-do-i-programming-the-sn65dsi86-registers. You can use the given spreadsheet to generate the register programming values based on the panel EDID information.

    Please also reference the programming guide: https://www.ti.com/lit/an/slla425/slla425.pdf and the following hardware implementation guide: https://www.ti.com/lit/an/slla343/slla343.pdf for more information.

    Thanks, Allison

  • 0 in reply to Allison Noe
    Prodigy 10 points

    Thank you Allison for this spredsheet.

    Please I sent you my schematic. could you check it? we have a big problem to get image on panel. When we try set anything we see on screen nothing. We have problem with AUX communication. There is som error in error registers.EM8310_V0SCH.PDF

    Thanks a lot

  • 0 in reply to Lukas Cepec
    TI__Intellectual 1205 points

    Hi Lukas,

    Can you provide your register dump as well? For the AUX communication problems, some DP sinks require source detection pull-up or pull-down resistors, so you might need to add resistors to the AUXP/N pins.

    Best, Allison 

  • 0 in reply to Allison Noe
    Prodigy 10 points

    Hello Allison

    Here is register dump.

    2656.Script_ASSR.txt 
    <aardvark> 
<configure i2c=1 spi=1 gpio=0 tpower=1 pullups=0/> 
<i2c_bitrate khz=100/> 

======REFCLK Frequency  ====== 
<i2c_write addr=0x2D count=1 radix=16> 0A 6 </i2c_write>/> 

======DSI Mode  ====== 
<i2c_write addr=0x2D count=1 radix=16> 10 26 </i2c_write>/> 

======DSIA Clock  ====== 
<i2c_write addr=0x2D count=1 radix=16> 12 7C </i2c_write>/> 

======DSIB Clock  ====== 
<i2c_write addr=0x2D count=1 radix=16> 13 7C </i2c_write>/> 

======DP Datarate  ====== 
<i2c_write addr=0x2D count=1 radix=16> 94 20 </i2c_write>/> 

======Enable PLL  ====== 
<i2c_write addr=0x2D count=1 radix=16> 0D 1 </i2c_write> <sleep ms=10/> 

======Enable ASSR in Panel  ====== 
<i2c_write addr=0x2D count=1 radix=16> 64 1 </i2c_write>/> 
<i2c_write addr=0x2D count=5 radix=16> 74 0 1 0A 1 81 </i2c_write> <sleep ms=10/>

======Enable enhanced frame and ASSR in DSI86  ====== 
<i2c_write addr=0x2D count=1 radix=16> 5A 5 </i2c_write>/> 

======Number of DP lanes  ====== 
<i2c_write addr=0x2D count=1 radix=16> 93 30 </i2c_write>/> 

======Start Semi-Auto Link Training  ====== 
<i2c_write addr=0x2D count=1 radix=16> 96 0A </i2c_write> <sleep ms=20/> 

======CHA Active Line Length  ====== 
<i2c_write addr=0x2D count=2 radix=16> 20 80 07 </i2c_write>/> 

======CHB Active Line Length  ====== 
<i2c_write addr=0x2D count=2 radix=16> 22 0 0 </i2c_write>/> 

======Vertical Active Size   ====== 
<i2c_write addr=0x2D count=2 radix=16> 24 38 04 </i2c_write>/> 

======Horizontal Pulse Width   ====== 
<i2c_write addr=0x2D count=2 radix=16> 2C 30 00 </i2c_write>/> 

======Vertical Pulse Width   ====== 
<i2c_write addr=0x2D count=2 radix=16> 30 12 00 </i2c_write>/> 

======HBP   ====== 
<i2c_write addr=0x2D count=1 radix=16> 34 58 </i2c_write>/> 

======VBP   ====== 
<i2c_write addr=0x2D count=1 radix=16> 36 0B </i2c_write>/> 

===== HFP  ====== 
<i2c_write addr=0x2D count=1 radix=16> 38 18 </i2c_write>/> 

===== VFP  ====== 
<i2c_write addr=0x2D count=1 radix=16> 3A 03 </i2c_write>/> 

===== DP-18BPP Disable  ====== 
<i2c_write addr=0x2D count=1 radix=16> 5B 0 </i2c_write>/> 

===== Color Bar Enable  ====== 
<i2c_write addr=0x2D count=1 radix=16> 3C 10 </i2c_write>/> 

===== Enhanced Frame, ASSR, and Vstream Enable  ====== 
<i2c_write addr=0x2D count=1 radix=16> 5A 0D </i2c_write>/> 

</aardvark>

    About AUX pins but i read in datasheet and in some thread in this forum that if we use eDP then pull resistors are not needed. Because this display is eDP interface.

    Thanks

  • 0 in reply to Lukas Cepec
    TI__Guru**** 153421 points

    Hi,

    The pullup/pulldown on AUX is optional for eDP but do depend on the eDP vendor requirement. Does the eDP vendor require AUX to have pullup/pulldown? Or can you try to add 100k pulldown to GND on AUXP and 100k pullup to 3.3V on AUXN and see if you are able to get AUX communication?

    Thanks

    David