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DS90C385A

Leonardo Rossi
Prodigy 30 points
Other Parts Discussed in Thread: DS90C385A

Hello,

I'm currently trying to implement video conversion through the help of a DS90C385A LVDS line driver IC.

The datasheet states on page 9 of 20 that there are 28 input bits, being 24 for 8 bit RGB and another 4 for control. However, it states that the control pins are HSYNC, VSYNC and DRDY (or data enable) - this sums up to 3, not 4.
So, my question is: What is pin #25 (TxIN23) for? The datasheet refers to is sometimes as RES and sometimes as CNTL. Is it an iput? It seems to be, cause the data on it is driven to the LVDS bus. What sort of data is that and how do I connect it to my DVP interface?

Thank you very much,

Leonardo Novak Rossi

  • 0
    TI__Mastermind 29655 points
    Hi Leonardo,

    You can regard this TxIN23 bit as an extra general-purpose bit. The reason why there are 28 input bits is because each LVDS pair, in OpenLDI fashion, serializes 7 bits per pair. Since a 24-bit application only requires a total of 27 bits to accommodate 8-bit RGB and 3 control signals (VSYNC, HSYNC, DE), there will be a leftover bit remaining. You can choose to tie the input low if it will be unused, which is typically the case. Otherwise, you can send additional control information if necessary on this input.

    Regards,

    Michael