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TDA4VM: PLL shows bus error

Hasan Aarzoo
Intellectual 485 points
Part Number: TDA4VM

Tool/software:

Hi TI,

I am having bus error or PLL. Do yo have any ideas why is it like that?

Looking forward to your response.

Best regards,
Hasan

  • 0
    TI__Mastermind 19980 points

    I don't fully understand your concern. The memory map for the PLL registers is not continuous; as an example it makes sense that 680030, 680034, and 680038 have values because there are registers at these addresses; it also makes sense that 68003C is uncertain because there is NO register at that address.

    If this does not answer the question, please re-ask.

    Kevin

  • 0
    Intellectual 295 points

    If some registers in the address range 0x680000 - 0x69FFFF, where the PLL registers are located, give a bus error, this may be due to lack of access authorization to the relevant addresses or to restricted access type (read/write).

    • When you see actual values: These are valid, implemented PLL registers that respond correctly to read operations
    • When you see "???????" with "bus_error": These are likely reserved or unimplemented addresses within the PLL register block. The hardware actively responds with a bus error to prevent reads from these addresses, hence the "bus_error" message.