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SN65DSI86: SN65DSI86 hardware questions

Yishan Chen
Intellectual 1910 points

Part Number: SN65DSI86

Hi Team,

Regard SN65DSI86, Customer want to know if we can support below requirements:


Source Bus type:4lane MIPI C/DPHY 2.5Gbps;
Source terminal number:1.0;
Sink Bus type:4lane DP1.2 or DP1.4 support 4K30;
Sink Terminal number:1.0;
Support Lane swap:Yes; (Type-C output, will plug-in forward and backward)

Thank you,

Yishan Chen

  • 0
    TI__Mastermind 28980 points

    Hi Yishan,

    Resolution:

    The SN65DSI86 converts DSI input to eDP output. It can support D-PHY only, up to 1.5 Gbps per lane for a maximum of 12 Gbps video bandwidth, as mentioned in the datasheet.

    It can support eDP 1.4, and the maximum DP rate per lane is 5.4Gbps.

    The 4K30 resolution bandwidth will depend on the exact PCLK used.

    As an estimate, if the pixel clock rate for 4K video at 30 fps is ~297 MHz, then the video bandwidth required will be = pclk * bpp = 297MHz * 24bpp = 7.128 Gbps. This should be supported since it is below the 12 Gbps DSI limit.

    Lane swap:

    The device also support lane swapping using the 0x59 register.

    DP Alt-mode and Type-C:

    For using DP output with Type-C, DP Alt-mode will need to be used with a suitable separate PD controller device, and type-C redriver such as TUSB546A. 


    Best regards,
    Ikram

  • 0 in reply to Ikram Haque
    TI__Intellectual 1910 points

    Hi Ikram,

    Thank you for your quick response.

    Two more questions to check the detail:

    1) Only support eDP1.4 or device can also support original DP1.2/1.4, I see from some posts that SN65DSI86 can also compatible to DP1.4?

    2) Are Lane swap and DP Alt mode are two differnt concepts? By using Lane Swap they can support type-C double-side plug in, but for the protocol, they still need chip to support.

    Thank you,

    Yishan Chen

  • 0 in reply to Yishan Chen
    TI__Mastermind 28980 points

    Hi Yishan,

    1. Yes this device can also support DisplayPort interface. The hardware and software configurations have to be done differently for DP applications.

    There are some details shared in this E2E thread: SN65DSI86-Q1: Driving a display port connector instead of eDP


    2. Could you tell us what you mean by lane swap. In my previous response, by lane swap I was referring to changing the output lane assignments for the pins.


    Ikram Haque said:
    For using DP output with Type-C, DP Alt-mode will need to be used with a suitable separate PD controller device, and type-C redriver such as TUSB546A. 

    Additional components will be required for type-C connection for DP alt-mode. You can consider using the TUSB546A if it works for your application.


    Best regards,
    Ikram