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LMH0030 TPG in SD PAL

arnaud douville
Prodigy 160 points
Other Parts Discussed in Thread: LMH0030

Hello,

I've got trouble using the LMH0030 for the generation of a PAL (BT601) test pattern.

Configuration of component is OK.

If I configure Test0 register so as to output a NTSC pattern, bit 7 of Test0 (PASS/FAIL) is asserted (logical high).

If I configure Test0 register so as to output a PAL pattern, bit 7 of Test0 is always deasserted (logical low).

I pay attention to modify I/O pin 7 config so as to be able to configure through register access only and I apply VCLK after complete initialization.

Moreover, even in NTSC (PASS/FAIL asserted), I've got nothing at SDI outputs.

Could anyone support us and/or give us some tests to be done?

Many thanks.

  • 0
    TI__Mastermind 20820 points

    Hi Sylvain,


    Somebody is ;looking into this and will respond shortly.

  • 0
    TI__Guru* 93670 points

    Hi Sylvain,

    Do you use the device mainly by IO ports only? Can you use the device by the register control? I have used the device using control registers and have been able to generate different patterns. Is this possible?

    Regards,,nasser 

  • 0 in reply to Nasser Mohammadi
    Prodigy 160 points

    Hello,

    Thanks for your reply.

    I found the problem!
    When TPG is used, BIST is available for all HD formats. For SD, it is only accessible in NTSC/Color Bars and PAL/PLL Pathological.
    I tried PAL/Color Bar and consequently PASS/FAIL bit was always stucked at zero. Using PAL/PLL Pathological, PASS/FAIL bit was one!

    Moreover, I can't get TPG at SDI Output (in an external monitor, in all standards: NTSC, PAL, 720p, 1080i, 1080p) even if my schematics seem to be the same as the LMH0030 eval kit.

    I've got trouble understanding the dual SDI output. Does that mean that we can use either:
      - only one output signal as a single SDI output independantly of the second output (aka connected or not)? In that case, should the second output be loaded (see R39 in the enclosed schematic) ?
      - both outputs as differential signals for used with a cable driver?

    Additionnally, please, can you check my schematics? I've got a doubt because the "master" sends 8-bit BT601 video (in PAL) while input parallel video port of LMH0030 is 10-bits. I keep LSB at zero: is it correct?

    Many thanks!