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TMS570LC4357: Is it possible to write to peripheral registers with the HTU?

Mark Steele
Intellectual 330 points

Part Number: TMS570LC4357

Hello, I'm trying to configure a peripheral register using the the N2HET by passing data using the HTU. 

I have the N2HET and HTU working well(I'm able to read/write from the RAM (512kB) portion of memory). However, I can't seem to write to peripheral registers. I'm specifically talking about this region here:

Is it possible to write to the peripheral registers using the HTU? Am I missing something? 

Thanks.

  • 0
    TI__Mastermind 49120 points

    Hi Mark,

    The "Peripheral Interconnect System" section in the TMS570LC43x TRM (spnu563) defines the access privileges for the different bus masters. I have pasted that table below:

    As you can see, HTU1/2 do not have the ability to access the peripheral regions.

    Regards,

    Sunil

  • 0 in reply to Sunil Oak
    Intellectual 330 points

    Hi Sunil,

    Thanks for the reply.

    It's weird that that table seems to contradict what is said in the HTU section. 

  • 0 in reply to Mark Steele
    TI__Mastermind 49120 points

    Hi Mark,

    The limitation on memory accesses from the HTU does not come from the HTU design. The HTU is still able to drive the full 32-bit address bus. The blocking is implemented in the interconnect to minimize chances of “network collisions” when multiple masters access a particular slave.

    Please note that the DMA controller is able to access the peripheral registers spaces. This would be not as efficient as using the HTU, but would save CPU bandwidth nevertheless.

    Regards,

    Sunil