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How to Use SRIO Maintenance Transection read destination's REG

user4514084
Prodigy 120 points
Other Parts Discussed in Thread: TMS320C6678

i have all the config ready 

I can communicate between DSP with Nwrite \ Request \ doorbell type .

.apart from that  i also can access switch's REG to change the router  by maintenance  package type ,

but how to access other DSP's REG to  get status of other DSP.

such  as the  interrupt flag bit? 

and i use c6638.

  • 0
    TI__Mastermind 28085 points

    Hi,

    Are you trying to configure the switch registers on SRIO maintenance transaction? Refer SRIO user guide document for SRIO maintenance transaction.

    When accessing RapidIO defined memory mapped register within an external device, RapidIO allows 4 bytes, 8 bytes, or any multiple of a double-word access (up to 64 bytes) for type 8 (maintenance) packets. The peripheral only supports 4-byte accesses as the target, but can generate all sizes of request packets. RapidIO is defined as big-endian only, and has double-word aligned big-endian packet payloads.

    Thanks,

  • 0 in reply to Ganapathi Dhandapani95
    Prodigy 120 points
    I have succeed in configuring switch router by Maintenance packets

    and now I want to access the DSP's status Reg (like DOORBELL_n InterruptConditionStatusRegister(DOORBELL[0-3]_ICSR)
    )
    could i use Maintenance type to access these Reg filed in dest DSP?
  • 0 in reply to user4514084
    TI__Mastermind 28085 points
    Yes, you can access these Reg field.
    Note: Accesses to the DSP Control/Status Registers are valid only from the DSP. Accesses to these registers are not allowed by an external PE through RapidIO maintenance transactions.

    Thanks,
  • 0 in reply to Ganapathi Dhandapani95
    Intellectual 840 points

    Hi,

    We wanted to access SRIO switch registers from DSP (TMS320C6678). Is there any example codes to perform maintainence read/write

    operation? 

    If yes, Kindly share the code.

    Regards,

    S.Sivanantham

  • 0 in reply to Sivanantham S
    Intellectual 840 points
    Hi,
    Now we are able to read srio switch registers. But when we perform write followed by read the switch register gives previous register value vice versa works fine. If we perform dummy maintainence write and then issue a maintainence write works fine.

    Is there anything else need to be taken care for maintainence read and write?

    Regards,
    S.Sivanantham
  • 0 in reply to Sivanantham S
    Prodigy 85 points
    Hi,
    I try to communicate between DSP and FPGA by maintenance read/write, but don't understand how to do it. If you have work code of maintenance operation, can you share it?

    With regards,
    Vladimir