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SRC4382: HW control solution for SRC+AES Tx + AES Rx

Barani Subbiah
Prodigy 150 points
Part Number: SRC4382
Other Parts Discussed in Thread: DIX9211

Looks like 4382 requires an external processor for control. Is there any other or SRC+Tx+RX combination solution that is HW control only. Thanks

  • 0
    TI__Expert 5645 points

    Hi Barani,

    As far as devices like Combo SRCs (SRC+TX+RX) go, we have lots of knobs to configure which will require huge # of input pins to configure the devices using HW control mode. Hence it is not practical to have the devices w. large pin count/package.

    So, we do not have HW control only devices w. this blocks integrated. But if the default state of the device works in your system, you can still consider it to be used. Please share the config requirements and i can let you know if it works as is...

    Best regards,
    Ravi

  • 0 in reply to Ravi Patil
    Prodigy 150 points
    Thanks for the suggestion. We are looking at default reg settings on datasheet. Our need is simple. We want to supply the MCLK to the chip for both Rx and Tx to keep in SYNC.

    AES RX side : AES in - SRC - driven by MCLK supplied by our FPGA - I2S out
    AES Tx side - I2S in - MCLK supplied by our FPGA - AES Tx out

    We want to use RX1+/RX1- port - Looks default

    We want to use Audio Serial port A - for I2S in to AES out (not sure why 2 ports?). Could you clarify? Can we use port A for both SDOUT (AES RX to I2S data out) and SDIN (I2S data in-AES TX) OR do we have to use port A for RX and Port B for Tx.?

    Let me know. Thanks
  • 0 in reply to Barani Subbiah
    Prodigy 150 points

    Any update on Audio Serial Port A and B usage?

  • 0 in reply to Barani Subbiah
    TI__Expert 5645 points
    Hi Barani,
    Looking into the details of the SRC4382, the device was intended to be used ONLY in SOFTWARE MODE as we have a Register 0x01 (Power-Down and Reset) which defaults to SRC/DIT/Serial Ports/DIR all disabled on initial power-up. The only way to get enable all the ports/blocks of this device is to poke this register...which would require I2C or SPI communication to write to register. Hence this device will not suffice for your use.

    Having said that, I strongly recommend DIX9211 as an alternative which will allow you to use DIR/DIT and AUX ports to achieve your requirements on power-up without needing SW mode. The device has DIR and you will take SE S/PDIF input on RXIN2 (default) and I2S output is available on Main Output Port. Similarly, the I2S input on AUXIN1 is routed to DIT and the S/PDIF output is available at MPO1.

    Please let me know if you have any additional questions regarding DIX9211.

    Best regards,
    Ravi
  • 0 in reply to Ravi Patil
    Prodigy 150 points

    Thanks. Looks like 9211 has no AES3 input (balanced). We may need to convert bal to unbal. Also, need a separate SRC on Rx side.

    Shame that SRC4382 does not default to AES in - I2S out and I2S in - AES out. We will have to see what we want to do with SPI.

  • 0 in reply to Barani Subbiah
    Prodigy 150 points

    Could you review this schematic  and let us know any comments? We have to go with an external SPI uC as this seem to be single chip solution for what we need.  Thanks.

    Can we get AES in to SDOUT and SDIN to AES out on Port A itself? 

  • 0 in reply to Barani Subbiah
    TI__Expert 5645 points

    Hi Barani,

    I tried to read the SCH on browser or by saving the image file, but it's quite hard to read as resolution is very bad. Can you please try to share the same?

    Also, as far as your question goes - answer is YES.

    The input of the DIT can be from one of four possible sources: Port A, Port B, the DIR, or the SRC. By default, Port A is selected as the source. You can change or configure the source using the Register 0x07 [Transmitter Control Register 1].

    Similarly, the AES Input can be routed from DIR block to Port A by selecting the appropriate value for AOUTS[1:0]='10' (DIR) in Register 0x03 [Port A Control Register 1].

    I assume that the system in question requires one of these audio streams at a given time. Please clarify the same.

    Best regards,
    Ravi

  • 0 in reply to Ravi Patil
    Prodigy 150 points

    AES in and out TI SRC page.pdfHere is a pdf version.

    The system is bi-dir and synchronous. AES in  - DIR - SRC - SDOUTA    

    SDINA - DIT - AES out

    Audio will be on both direction and all the time.

    Barani.