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TDA2SX: Is it OK to mix VIN(VIP) pin groups?

Li Niu
Prodigy 131 points
Part Number: TDA2SX
Other Parts Discussed in Thread: TDA2

Due to routing constraint, we cannot have a group of consecutive pins (for example VOUT1_D0 to VOUT1_D7) on the TDA2 to be assigned to the same VIN(VIP) group input.

Is it OK to break the group? 

For example, as the picture below indicated, we have some of them assigned to VIN3 and some of them assigned to VIN4. 

Based on the TDA2 datasheet, all these pins can be mux-ed to either to VIN3 or VIN4. we couldn't find any document confirm or disconfirm if the pin groups can be mixed and matched.

We have our product on the line waiting for this... we'd really appreciate you guys input!

Li

  • 0
    TI__Guru**** 482295 points

    Hi LI,

    Well, this depends really on your input data format. If your input data format is YUV422, which requires just D0 to D15 datalines, it should be ok. But if your input data format on VIN3A is RGB888, then it is not possible to mix the data lines as shown above. Also please check pinmux and see if above VIN4A datalines also support missing VIN3A datalines, there is a possibility to mix them.

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    Prodigy 131 points

    Hi Brijesh, 

    Thanks for your reply. We are using this in image radar application where all 24 bit data lines are being used. (which is similar to your RGB888 example. 

    We did checked the TDA2's pinmux and they support the above-mentioned pin functions.

    Could you please elaborate why in RGB888 case we cannot mix data lines?

    THanks

    Li

  • 0 in reply to Li Niu
    TI__Guru**** 482295 points

    Hi LI,

    Li Niu said:
    Could you please elaborate why in RGB888 case we cannot mix data lines?

    Because then we need to use two VIN ports to capture data and then need to manually merge the captured data.. I would not recommend doing this. Instead, if single VIN port can be used for capturing RGB888 format, by changing pinmux, it would be easier. 

    Regards,

    Brijesh