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DLP2010EVM-LC: having the EVM dictate to the PC what resolution and fps it needs

John Staples
Intellectual 410 points

Part Number: DLP2010EVM-LC

Most video input devices have a list of supported resolutions and fps and have one default one. DLP2010EVM-LC does not.

I already had a discussion with your team regarding how to achieve this with DLPC-EVM and custom DLP PCB further down the road. I was suggested to move this to private messages, but while I am thankful for the help the PMs I get are at around 10 day intervals and I haven't gotten a response in the last 13 days. I believe my question was rather simpe. I was dicusssing this with Navneet Singh.

This is getting pretty out of hand so I'm moving this back to the forums.

To summarize:

EDID needs to be reprogrammed for this. TI representative said he would provide the new firmware to reflash with.

For this a "Devasys board" and "Adapter board" is needed.

While I was finally linked to the exact "Devasys board" product when asked, I also asked the same for the "Adapter board" and wasn't. I asked again 13 days ago. I don't think that's much to ask. I believe this info could even be its own public access document since it's not a rare thing to need rather than going in a needless path of accepting friend request and getting it via private messages..

Regardless please link the exact "Adapter board" needed, here or via PM again, I don't care. I just can't wait any longer for Navneet.

  • 0
    TI__Mastermind 20045 points

    Hello John,

    Sorry for the delays in communication. Are you simply looking to try to test various input resolutions? Note that you can simply ignore the EDID and send whatever resolution you would like. The EDID is essentially a flash device on the front end to tell the HDMI to parallel chip what resolutions it should accept. This is a third party (ITE) chip.

    The list of supported resolutions by the TI DLP chipset itself is in the DLPC3470 datasheet. The DLPC3470 is the controller that controls the DMD on the EVM. As long as the DLPC3470 receives the properly encoded data at one of the supported resolutions, it will be able to properly display what's needed. Note the DLP2010 DMD native resolution is WVGA (854x480).

    Thanks,

    Kyle

  • 0 in reply to Kyle Rakos
    Intellectual 410 points

    Hi Kyle,

    To reiterate the requirements from a previous post, we need the EVM to tell what resolution and fps it needs from the host, not the other way around. We are not using a Windows PC as the host. We need the EVM EDID to specify 854x480 @ 104 fps.

    Navneet explained that a Devasys board ( http://www.devasys.com/usbi2cio.htm ) and Adapter board "for connecting the Devasys board to HDMI" will be needed, as well as "8 pin clip to program the EEPROM - which will also help you to remove write protected (pin 7 )", "we are shorting the pin 4 and 7" and that we will receive a new binary for the EEPROM with the settings we need.

    So right now we need a link to the "Adapter board" to know which one is needed exactly and the binary file to reflash the EEPROM.

    Thank you.

  • 0 in reply to John Staples
    TI__Mastermind 20045 points

    Hello John,

    Allow me to clarify a few things about the EDID. The EDID (Extended Display Identification Data) is simply as standard data format that is stored in the EEPROM which will tell a video source (such as a PC over HDMI in your case) what video data is accepted. Therefore, you can use any standard EDID editor to create a custom EDID file. It can then be programmed to the M24C02-WMN6TP EEPROM device on our board using any tool supported to reprogram an EEPROM. I believe Navneet was looking into what tools we have used in the past at TI; however, there shouldn't be anything specific from our side on what's needed. The relevant circuit info can be found here and a screenshot is below.

    For us the Devasys is used to convert USB of the PC to I2C. The adapter then sends the I2C signals over the HDMI connector to the EEPROM (U17) to reprogram it. It will likely depend on your tool setup how this is done. Other times clips can be used to directly connect to the EEPROM and program it as well. I hope this info helps.

    Thanks,
    Kyle

  • 0 in reply to Kyle Rakos
    Intellectual 410 points

    Hi Kyle,

    Thank you for the clarification.

    Can you please specify what Adapter board you use and would recommend to use with the DLP boards?

  • 0 in reply to John Staples
    TI__Mastermind 20045 points

    Hello John,

    It is a custom internal adapter board. I am unaware of what publicly available options may exist. Alternatively your own board could be made.

    Thanks,
    Kyle