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DM365 PRTCSS

Robin Iddon
Intellectual 380 points

Hi,

Does anybody have any useful documentation for the PRTCSS - the documentation in the datasheet is too vague to be of use, and I'm trying to understand how the spectrum digital EVM works (just looking at schematics - my EVM hasn't arrived yet [8-)] and I'm trying to pull together a design for our product's power supply.

 

Thanks in advance,

 

Robin Iddon

  • 0
    TI__Mastermind 41665 points

    I believe the document you are looking for is TMS320DM36x Digital Media System-on-Chip (DMSoC) Power Management and Real-Time Clock Subsystem (PRTCSS) User's Guide (SPRUFJ0). Unfortunately this document is not publicly available yet, I do believe it should be available soon and is going through final reviews. What sort of questions did you have about PRTCSS that may be answerable in the mean time?

  • 0 in reply to Bernie Thompson TI
    Intellectual 380 points

    Hi, thanks for the reply.

    Firstly power sequencing - the main data sheet talks about sequencing main power 1.2/1.8/3.3 and confusingly references the PRTCSS power supplies too, but I'm assuming that VDD18_PRTCSS and VDD12_PRTCSS stay powered at all times, including before any of the main power supplies are active?  I'm also assuming that VDD12_PRTCSS should come up first, then VDD18_PRTCSS.  What's the function of the PWRCNTON and PWRST pins and how should they be sequenced relative to ?

    Secondly, what features does the PRTCSS have whilst powered down?  It has a bunch of GPIO lines - I'm assuming these just remain static levels whilst powered down, i.e. they operate as outputs - but what purpose do the inputs serve in this state?

    I just need to know enough to make sure I don't wire it up wrong - I only need the RTC function - I use an external microcontroller to do actual power on/off and sequencing.

    Thanks in advance for any info you can offer.

    Robin

     

  • 0 in reply to Robin Iddon
    Intellectual 380 points

    Oops - at the end of the first para I meant:

    What's the function of the PWRCNTON and PWRST pins and how should they be sequenced relative to VDD12_PRTCSS and VDD18_PRTCSS?

  • 0 in reply to Robin Iddon
    Intellectual 650 points

    Hey Robin,

                        We've done a succesful DM365 board design and had the same questions you did - for the PRTCSS, we chose to power 1.2V DSP Core and PRTCSS together, and went with a 1.2V -> 1.8V -> 3.3V sequencing chain without having any problems

    As for PWRCNTON, and PWRST, follow what the EVM does (See the reference EVM design PDF), as they tie it specifically to one of the two rails.

    PWRCNTON -> tie to 1.2V

    PWRST -> tie to GND

    Jerry

  • 0 in reply to JerryJohns
    Intellectual 380 points

    Hi Jerry,

     

    Thanks for that  - I'm assuming you didn't use the RTC, then?  Or did you leave the main 1.2 powered all the time as well as the PRTCSS?

    Thanks,

    Robin

     

  • 0 in reply to Bernie Thompson TI
    Expert 2315 points

    SPRUFJ0A is confusing me as it lists two registers for PRTC interface namely PRTCIF and PRTCSS but ARM memory map (sprufg5a) give address of PRTCIF as 0x01C69000 and no address for PRTCSS and dm365 datasheet (sprs457d) gives address of PRTCSS as 0x01C69000 and no address for PRTCIF.  The way I see it from PRTC datasheet there must be two addresses.  Please show me where to look for a proper data.

    Thanks, Jinh T.