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LMH0030 and 720p50

loic BOISSY
Prodigy 10 points
Other Parts Discussed in Thread: LMH0030, LMH0340

Is it possible to generate SDI 720p50 output signal with the LMH0030 serializer?

Thanks.

Loic

  • 0
    TI__Expert 4400 points

    The LMH0030 directly supports the standards listed in Table 4 "Video Raster Format Parameters" of the datasheet.  Please note that 720p50 (per SMPTE 296M, format 3) is not included in this table and thus is not "directly" supported.

    Although the LMH0030 is not capable of automatically processing this format, it is still capable of serializing it.  The LMH0030 allows for operation as a generic serializer as described in the "Processing Non-Supported and pSF Raster Formats" section near the back of the datasheet.  Essentially, this is accomplished by turning off the TRS and format recognition system.  So, automatic handling and insertion of CRCs and line numbers is not available but the basic data is serialized correctly.  Pre-processing of the parallel data ahead of the LMH0030 can be used to handle line numbering and CRC generation.

    Gary Melchior

  • 0
    TI__Genius 13475 points

    For a serializer capable of supporting all SMPTE defined formats, please look to the LMH0340.

     

  • 0 in reply to Mark Sauerwald88474
    Prodigy 60 points

    In order to "PROCESSING NON-SUPPORTED AND pSf RASTER FORMATS", which values registers should be set?

    • FORMAT_0 (@0x0B) = 0x3F
    • TEST MODE_0 (@0x55) = 0x16
    Is there any registers to set to enable bypass function? (to be shure that CRC will not be computed, and Line Number not added)
    Thanks in advance.
    Thierry HAUSER
  • 0 in reply to HAUSER Thierry
    TI__Expert 4400 points

    In order to configure the LMH0030 for processing non-supported / pSF raster formats, the only register write needed is:

    • FORMAT 0 (register 0x0B) = 0x3F

    This sets the LMH0030 to process a "non-specific" HD format.  This mode disables the EAV/SAV indicators, and guarantees that line numbering and CRC insertion are disabled.  There is no separate bypass function needed (or provided).

    Gary Melchior