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questions about 75lvds83b and L138

Zhang Jingpo
Intellectual 280 points
Other Parts Discussed in Thread: SN75LVDS83B, OMAP-L138

Hello everyone:
 
Now I have one question about sn75lvds83b, it is how to connect 75lvds83b to OMAP-L138, the LCD port of L138 is 16-bit, how to extend it to 18-bit. the LCD I used is 18-bit, LVDS interface. my e-mail: zhangjp2008@sina.com

  • 0
    TI__Guru 64510 points

    Zhang Jingpo said:

    Now I have one question about sn75lvds83b, it is how to connect 75lvds83b to OMAP-L138, the LCD port of L138 is 16-bit, how to extend it to 18-bit. the LCD I used is 18-bit, LVDS interface.

    In the TMS320C674x/OMAP-L1x Processor LCD Controller User's Guide (SPRUFM0), take a look at Section 2.5.2 regarding the Frame Buffer format.  In 16-BPP mode illustrated in Figure 15, you will see the RGB format is 5-bits R, 6-bits G and 5-bits B.

    You can tie the MSB (most significant bit) and LSB (least significant bit) together for the Red and Blue components.

  • 0 in reply to BrandonAzbell
    Intellectual 280 points

    BrandonAzbell:

     Thank you. I tried the method you told me ,and Now the LCD works well.

     In fact , I have two kinds of LCD port in my design, one is TTL, the other is LVDS, the TTL port works well now , the LVDS port still has some problem i don't know,  Does it have relationship with the driver? because I test the LVDS port use the same Driver with the TTL port.

    B.r.

    zhang 

  • 0 in reply to Zhang Jingpo
    TI__Mastermind 43875 points

    zhang,

    What is happening with the LVDS display?

    Is the resolution the same as your parallel display?

    Do you get an image, but with wrong colors or do you get no image at all, or a jumping image?

    As long as you send the correct resolution to the LCD it should work in exactly the same way as the parallel LCD.

    You may find the OMAP3 Wiki page informative too. Much of the information on connectivity is relevant to all TI media processors. The only differences really are to do with the number of color bits per channel.

    http://wiki.omap.com/index.php/Display_Subsystem

    BR,

    Steve

  • 0 in reply to Steve Clynes
    Intellectual 280 points

    Dear Steve:

    There is nothing in the LVDS display . the resolution is the same as the parallel display , 640*480,  I use the oscillograph to check the SN75LVDS83B's outputs,  there are some signals, I think they are right the LVDS signal, but why there is no display I really don't know, I'll try again.

    Thank you.

    BR.

    zhang