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Multi-channel audio input with McBSP on C6654

yuhsun chen
Prodigy 190 points
Other Parts Discussed in Thread: PCM1865

Hi

1.Can I use McBSP connect to three ADC/DAC?

2.How to implement hardware connect?

Thanks.

  • 0
    TI__Mastermind 42545 points

    Hi,

    The McBSP is designed to allow multiple devices to drive different channels on a serial stream. You should be able to find ADC and DAC devices that are compatible with the McBSP interface on the TI.com. Implementation will depend on the device selected. Generally you will provide a master clock to the ADC/DAC devices. One will act as a master which generates the framesync and clock for the McBSP interface. The rest of the ADC/DAC devices and the C6654 would accept the clock and framesync as an input. 

    Regards, Bill

  • 0 in reply to Bill Taboada
    Prodigy 190 points

    Hi 

    For example, C6654 connector to two PCM1865 shared RX pin of McBSP. Is it can work?

    I concern is one PCM1865 transfer data and another rest, but they are both output pin.

  • 0 in reply to yuhsun chen
    TI__Mastermind 42545 points

    Hi Yh,

    The data manual for the PCM1865 does indicate that it supports a TDM mode. Time division multiplexing usually allows multiple devices to share the same transmit and receive pins by only driving the output during a specific period of the entire data transfer. The data manual implies that the PCM1865 can support that mode but doesn't provide any specifics information on how it should be configured. It also doesn't have any timing information on how the frame sync is provided or accepted. You'll have to post a question to the forum which specifically supports that part  to get the information you need.

    Regards, Bill

  • 0 in reply to Bill Taboada
    Prodigy 190 points

    Hi Bill,

    I will check SW. But, I am worry about HW connector. 

    Example:

    PCM1865 transfer data to C6654 via McBSP, then DOUT PIN of AIC3101 is low or high or high Impedance?

    If AIC3101 is high or low that it affect PCM1865 transfer data to C6654. I mean PCM1865 output high, but AIC3101 out default low. C6654 will get voltage is error.

    Could you help me check if DOUT pin status of PCM1865 and AIC3101 is not use status.

  • 0 in reply to yuhsun chen
    TI__Mastermind 42545 points

    Hi Yh,

    I understand your question but you are asking the question on the wrong forum. We support the C6654 and other multicore processors on this forum but we are not experts on the ADC and DAC devices. 

    From my experience, devices that are using a TDM type interface will only drive their DOUT pin during the channels that are assigned to them. Once a device has finished driving the bits of data on DOUT, it will tristate the output to allow another device to drive the signal. As I said, you'll have to ask the ADC/DAC experts if the devices can share a connection to the McBSP. Since they are both TI parts, the proper support people should be able to tell you if they are compatible with McBSP.

    Regards, Bill