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Original question:

TVP5158 only one channel loss synchronization

Check Lock Status

Yuto Sakai
Mastermind 6100 points


Hi,

I have a question in a previous E2E post.
I would like to check Lock Status in register "00h". Which bit should I check?

Since there is one register for 4 channels of video input, it can not be determined which camera is out of sync.

Is this register confirming the sync signal on the output side?
Or should we look at another register?

Best regards,
Yuto Sakai

  • 0
    TI__Guru 65405 points

    Hi Yoto Sakai,

    Check section 4.2 Table 4.2 about Lock status Lost lock detect, Color subcarrier lock status, Vertical syn clock status and Horizontal sync lock status bits please:

    There is only one register reporting these lock statuses.

    Regards,
    Tsvetolin Shulev

  • 0 in reply to Cvetolin Shulev-XID
    Mastermind 6100 points

    Hi Tsvetolin-san,

    I'm sorry for late reply.
    I understand that the address to confirm is 00h.
    Is there any way to check which channel is not synced?
    If not, what lock status should we check for phenomena that can not be synchronized?

    Best regards,
    Yuto Sakai

  • 0
    TI__Mastermind 43875 points

    Please review registers FEh and FFh. These registers control which of the 4 decoders will receive/return register write/reads.

    For example, to write to decoder #3 and ONLY decoder #3 set bit 2 in register FEh

    To read from decoder 2 it is necessary to set bit 1 in register FFh. The default decoder for register reads is to read from decoder #1.

    Kind regards,

    Steve