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  • Forum Post: Re: TVP5150AM1 no NTSC colour lock

    David Ambry
    Kevin Are you using this device with a YPbPr input? No that's fine Kevin, I'm not insulted. I'm sure you must come across a lot of people that don't know composite from component, but I'm not one of them. I've put a THS8200 on the bus from the TVP5150AM1 to reconstruct my...
    on Sep 14, 2009

  • Forum Post: Re: TVP5150AM1 no NTSC colour lock

    Larry Taylor
    Dave, Are you using a nominal NTSC input with color burst present at all times? Regarding potential TVP5150AM1issues: - When an external clock or oscillator is used, 1.8V logic levels should be used. You are seeing the same issue when a crystal is used, so this may not be causing this particular...
    on Sep 14, 2009

  • Forum Post: Re: TVP5150AM1 no NTSC colour lock

    David Ambry
    Hi Larry, thanks for getting back to me. My responses to yours as follows: Yes, the burst is present at all times. Last night I burned a DVD with SMPTE-75 colour bars in NTSC format and here are some pics of the mighty Bravia hanging off the component out of the 8200 (hope this works): YPrPb...
    on Sep 15, 2009

  • Forum Post: Re: TVP5150AM1 no NTSC colour lock

    Larry Taylor
    Brad, Pb looks OK, so YC separation in the TVP5150AM1 and the crystal are most likely not the issue. Cb and Cr use the same digital data path, so this appears to be ouput DAC or cable related. Does PAL work well consistently? If this were a DAC channel issue, I would suspect both PAL and NTSC to be...
    on Sep 15, 2009

  • Forum Post: Re: TVP5150AM1 no NTSC colour lock

    David Ambry
    Brad??? Hi Larry, the 20ppm xtal made no difference whatsoever. Yep, PAL is consistently perfect. I am at a loss as to where to go from here.
    on Sep 28, 2009

  • Forum Post: Re: TVP5150AM1 no NTSC colour lock

    David Ambry
    Is it possible that there is some issue associated with the timing of the 4:2:2 decode? That is, when the THS8200 samples the parallel bus, that would be different between PAL and NTSC?
    on Sep 28, 2009

  • Forum Post: Re: TVP5150AM1 no NTSC colour lock

    David Ambry
    Should have done this earlier. I'm guilty of postulating causes when I didn't understand the fault. (Where do I hand in my degree?) Here's Pb on the little 'scope: and here's Pr: You can see the Pr signal polarity alternates with every line, effectively cancelling out the...
    on Sep 28, 2009

  • Forum Post: Re: TVP5150AM1 no NTSC colour lock

    Larry Taylor
    David, Other than turning on the TVP outputs, are you using default TVP5150 settings with the THS8200 settings that were sent? I am having trouble figuring out what could be causing Pr to invert every other line. Are you still using a direct connection from the TVP5150 to the THS8200? Are you seeing...
    on Sep 30, 2009

  • Forum Post: Re: TVP5150AM1 no NTSC colour lock

    David Ambry
    Hi Larry, Yep, I've tried the default settings as well as my own custom settings to force the 5150 into just NTSC mode by loading #00000010B (0x02) into reg 0x28. As you can see from the above CRO shots, the problem has nothing to do with the THS8200. As the R-Y signal is reversed on alternate...
    on Sep 30, 2009

  • Forum Post: Re: TVP5150AM1 no NTSC colour lock

    David Ambry
    Finally got a few moments where I decided to follow this one through (or die in the attempt!) I measured the colour burst frequency and what do you know - it's 4.433MHz - the source is being recoded from NTSC to PAL (NTSC is 3.579MHz), although still as 480i60. I had assumed (fairly I think) it...
    on Oct 1, 2009

  • Forum Post: SVGA display not working with DM6446 interfaced to THS8200

    deepthi kiran
    Hi, We are having a custom board in which DM6446 is connected to THS8200 to get SVGA display on monitor. 16bit YCbCr is interfaced to THS8200 with FID pin connected to GIO3/LCD_FIELD_B0.Color space conversion is enabled since YcbCR to RGB conversion is required and I have programmed the color space...
    on May 20, 2010

  • Forum Post: Re: SVGA display not working with DM6446 interfaced to THS8200

    Larry Taylor
    Hi Deepthi, Can you describe the failure? Is there no output at all? How is the GIO3/LCD_FIELD_B0 bit being used and is this signal at a constant logic level? Your dtg1_field_flip (REG36h) and dtg2_fid_pol (REG82h) settings require that this signal be at a logic low level for proper THS8200 field...
    on May 20, 2010

  • Forum Post: Re: SVGA display not working with DM6446 interfaced to THS8200

    deepthi kiran
    Hi Larry, Thanks for your quick replay Right now we have pulled GIO3/LCD_FIELD line to ground in the hardware, what do we need to do program 0x36 reg.0x82 Yestruday I had typed it half by miskate I clicked on Post so complete query didnt posted, after that I posted the quirey again completly...
    on May 21, 2010

  • Forum Post: Re: SVGA display not working with DM6446 interfaced to THS8200

    Larry Taylor
    Deepthi, When using discretes with the FID input pulled low, use dtg1_field_flip = 1 (REG36h=80h). The REG82h setting depends on sync polarites. SVGA60Hz required postive output syncs. If the DM6446 is outputting postive HS and VS, try REG82h=1Bh. If the DM6446 is ouputting negative HS and...
    on May 21, 2010

  • Forum Post: Color Space Conversion with THS8200

    shahin f
    Hello, I am converting YCrCb to RGB using the Color Space Conversion (CSC) block in the THS8200. In the data manual as an example a coefficient set is given for HDTV YCC to RGB conversion. Now my question is whether I could use the same coefficient set for NTSC YCrCb conversion to RGB or not. ...
    on May 24, 2010

  • Forum Post: Re: Color Space Conversion with THS8200

    Larry Taylor
    Hello, SDTV and HDTV YCbCr clor spaces are different, so different CSC coefficients will be requried when converting to RGB. Below are example THS8200 CSC and CSM settings for converting both HDTV and SDTV to RGB. BEGIN_DATASET // DATASET_NAME," YCbCr to RGB Using SDTV CSC coefficients and...
    on May 25, 2010

  • Forum Post: Re: Color Space Conversion with THS8200

    shahin f
    Thanks a lot Larry!
    on May 25, 2010

  • Forum Post: Re: SVGA display not working with DM6446 interfaced to THS8200

    deepthi kiran
    Thanks Larry, Now Iam able to get display on Monitor. But only blue component is getting displayed. We have connected THS7303 amplifier to THS8200 and RGB o/p from amplifier is connected to monitor. We have programmed amplifier with 0x94 for all channels.but if we probe on CRO we are getting...
    on May 27, 2010

  • Forum Post: Re: SVGA display not working with DM6446 interfaced to THS8200

    Larry Taylor
    Deepthi, The THS7303 DS also recommends using an RC filter circuit (100-ohm / 22pF) on SCL and SDA for noise immunity. I think there is a potential I2C issue if this is not done. Are you able to read the 3 channel registers to see if all 3 have been programmed? Are you using AC or DC coupling...
    on May 27, 2010

  • Forum Post: Re: SVGA display not working with DM6446 interfaced to THS8200

    deepthi kiran
    Thanks Larry for your good support. Now after putting RC filter Iam able to get the display properly. But instead of white Iam getting Yellow patchs on white.What can be the issues. I have enabled color space conversion by programing the register values as below 0x04- 0x81 0x05- 0xd5 0x06...
    on May 28, 2010

  • Forum Post: Re: SVGA display not working with DM6446 interfaced to THS8200

    Larry Taylor
    Deepthi, Are you still having the color issues? Can you describe the test pattern being used and color patches you are seeing? Do the color artifacts appear throughout the pattern or just after video edge transitions. CSC settings could affect overall color but should no cause color patch artifacts...
    on Jun 4, 2010

  • Forum Post: Re: SVGA display not working with DM6446 interfaced to THS8200

    deepthi kiran
    Hi Larry, That issue got resolved, that was because Under-/overflow protection was off, now it is fine, now little bit flickering is there, or other wise it is fine, Thanks for your support provided to resolve the issues Thanks and Regards Deepthi
    on Jun 7, 2010

  • Forum Post: Re: THS8200 Register settings for HD video

    James Nave
    Xiaoyu, Thanks for your interest in the THS8200. We'll respond to your question as soon as possible. Regards, Jim
    on Jul 16, 2010

  • Forum Post: Re: TVP5150AMI data output pin

    Larry Taylor
    Steven, The THS8200 does not support an 8-bit 4:2:2 discrete sync interface. ITU-BT.656 embedded syncs must be used with 8-bit 4:2:2. Discrete syncs can be used only with the 16 or 20-bit 4:2:2 and 24 or 30 bit 4:4:4. TVP5150AM1>THS8200 S-video to YPbPr conversion can be supported by the 8-bit...
    on Jul 16, 2010

  • Forum Post: Re: THS8200 Register settings for HD video

    Larry Taylor
    Xiaoyu, Below are the addtionial graphics settings. All that changes for the various graphics formats is pixels per line, line per frame, HSOUT width, VSOUT width, and HS/VSout polarity. Regarding the HD settings, what type of interface will you be using? Will it be like the graphics interface...
    on Jul 16, 2010
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