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DLP 0.55 XGA Bit depth & frame rate

Enio Alburez
Prodigy 100 points
Other Parts Discussed in Thread: DLPC200

Hello community menbers.

I'm working in an application that requires the projection of a large number of light patterns at a very high speed.

From the data manual of the 0.55XGA Chipset : "... enables DMD patterns to be refreshed with frequency rates up to 5000Hz binary and over 700 Hz in 8 bit Gray scale." .

  • I would like to know how to determine the maximum bit depth at a specific frame rate, since the application works between the 700 and 5000 hz limits and requires the highest possible bit depth.

I'm also interested in expanding the 960 binary patterns limit of the chipset. From the data manual: "The 0.55 XGA Chipset relies on the use of SDRAM to store DMD formatted patterns."

  • Which is this format?
  • What is the size of a XGA  8 bit depth image in this format?
  •  Is the amount of memory that can be addressed by the DLPC 200 SDRAM INTERFACE the limitation?
  • Are there other limitations?

Regards.

Enio

  • 0
    TI__Mastermind 30875 points

    Hi Eino,

    Please find response to your question.

    I would like to know how to determine the maximum bit depth at a specific frame rate, since the application works between the 700 and 5000 hz limits and requires the highest possible bit depth.

    The DLP LightCommander 0.55XGA DMD controller DLPC200 supports only two bit depths 1bit or 8bit. So highest possible bitdepth is 8bit and max possible frame rate is 700Hz.

    I'm also interested in expanding the 960 binary patterns limit of the chipset. From the data manual: "The 0.55 XGA Chipset relies on the use of SDRAM to store DMD formatted patterns."

    Which is this format? It is a raw data format. Incase of 1bit pixel depth each pixel value has ('0' or '1'). So 8 pixels are grouped into 1 byte, so 1024*768/8 = 98304 Bytes or 96KB. In case of 8bit depth each pixel has 1byte of memory space.

    What is the size of a XGA  8 bit depth image in this format? For 8bit depth the size of image will be 1024*768*8 bits or 768KB

    Is the amount of memory that can be addressed by the DLPC 200 SDRAM INTERFACE the limitation?  Yes it is the Interface limitation.
    Are there other limitations? DLPC200 allows only 1bit or 8bit depth patterns.

    Regards,

    Sanjeev