• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 100 subscribers
  • Views 98 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRA821U: DRA821U

Goran Stojcevski
Prodigy 100 points
Part Number: DRA821U
Other Parts Discussed in Thread: DRA821

Hi,

We are developing a new product called Automotion Server that is one is a evolution on a existing product.

The new product will be based on DRA821 processor.

The existing product is using a co-processor which main tasks are to handle the reset and supervisory of the main processor.

So when the product is powered up the co-processor is checking that all the main power input to the product is OK and then resets the main processor.

It also continuously monitors the main processor during runtime where the main processor needs to kick a watchdog in the co-processor and if this fail the co-processor will initiate a power failure/backup step.

My question for the new product where we will use the DRA821 processor if the R5F cores inside the DRA821 can be used instead of a seperate co-processor.

Are the R5F cores completly isolated from the other cores(Dual A72) and domains and can be powered and reset seperatly ?

I would like to use the R5F cores to monitor the power input with an ADC and if the power input is OK the R5F cores will pull the rest of the processor domains out of reset.

The R5F cores will need to continously monitor the other domains during runtime and if the the domains hangs the R5F core will initialize a controlled power down.

It his possible to use the R5F cores like this.

Thanks!

Regards

Goran

  • 0
    TI__Guru* 93771 points

    Hi Goran,

    The DRA821 would seem to be a good fit for everything that has been described in your post.  The DRA821 TRM (https://www.ti.com/lit/pdf/spruiu1) and DRA821 Datas Manual (https://www.ti.com/lit/ds/symlink/dra821u.pdf) contains much of the information you are after.   

    Also encourage you to contact your local TI representative to over the details of the use case.

    "Are the R5F cores completly isolated from the other cores(Dual A72) and domains and can be powered and reset seperatly ?"  

    Yes

    "I would like to use the R5F cores to monitor the power input with an ADC and if the power input is OK the R5F cores will pull the rest of the processor domains out of reset."

    The DRA821 Analog-to-Digital Converter (ADC) module contains a single 12-bit ADC which can be multiplexed to any 1 of 8 analog inputs (channels). For more information, see Analog-to-Digital Converter (ADC) section in Peripherals chapter in the device TRM

    "The R5F cores will need to continously monitor the other domains during runtime and if the the domains hangs the R5F core will initialize a controlled power down."

    Reference TRM Section 12.6.2.1 RTI Overview, for details on readily available watch dog timers.   For further information on monitoring of "other domains" this will be use case dependent for which the device will have mechanisms available for.   

    The Software Diagnostic Library (Software Diagnostics Library (SDL) — Software Diagnostics Library (SDL) - J7200 User Guide) goes over available Software Diagnostics examples that may be of use in your product, and the DRA821 Safety Manual is also a recommended read when considering which mechanisms are most applicable.

    The DRA821 Safety Manual is available under NDA, upon request.

    Regards,

    kb