• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 1474 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

AWR1243: AWR1243

tom daglas
Intellectual 440 points
Part Number: AWR1243

hello

in document of AWR1243 Cascading, Said for Digital frame timing synchronization, The SYNC_OUT pin of Master connect to Slave's SYNC_IN and for avoid of delay feed back into Master's SYNC_IN.

1-Is it necessary to connect Master's SYNC_IN to external processor which now connected to Master's SYNC_OUT to avoid delay? 

2-Is it necessary to connect Master's SYNC_OUT to external processor? or can not use of this pin for SOP(Sense On Power)? need to use 47.5K resistor  which said in datasheet?

3- If cascading circuit is not considered and we want to use single AWR1243 chip, can we not connected Master SYNC_IN and SYNC_OUT to external processor?

Thank for your attention.

  • 0
    TI__Mastermind 22155 points
    Hello Tom,
    One of our systems experts will get back to you on this query. Thanks for your patience.

    -Raghu
  • 0 in reply to Raghunandan Kamath
    Intellectual 440 points
    Hello
    Thank for your attention.
  • 0 in reply to tom daglas
    TI__Expert 7215 points
    Hi Tom,

    Thank you for your patience.

    I hope you are referring to below document
    www.ti.com/.../swra574a.pdf

    As mentioned in Section 2, There are 2 configuration possible:
    The frame timing synchronization is controlled by a) the master chip in case software message based
    triggering of frames is desired or b) by the host processor in case hardware triggering of frames is desired.


    a) the master chip
    ==============================================================
    HW consierations
    SYNC_OUT of master should be connected to SYNC_IN of Slaves as well as Master.
    There is no connection to the host is required.

    SW consierations
    Master Should be configured as SW triggered (Refer to rlSetFrameConfig API in mmWaveLink)
    Slaves should be configured as HW triggered
    ==============================================================

    b) by the host processor
    ==============================================================
    HW consierations
    SYNC_IN of Master and Slaves are connected to Host.
    SYNC_OUT of master and slaves are NOT used in this confiugration

    SW consierations
    Master Should be configured as HW triggered (Refer to rlSetFrameConfig API in mmWaveLink)
    Slaves should also be configured as HW triggered
    ==============================================================

    To your last question
    In case of Single Chip, again there are 2 modes.

    a) HW trigger
    SYNC_IN of single AWR1243 should be connected to Host.
    AWR1243 Should be configured as HW triggered (Refer to rlSetFrameConfig API in mmWaveLink)

    b) SW trigger
    SYNC_IN and SYNC_OUT should not be connected anywhere
    AWR1243 Should be configured as SW triggered

    Regards,
    Kaushal
  • 0 in reply to Kaushal Kukkar
    Intellectual 440 points
    thank you very much
  • 0 in reply to Kaushal Kukkar
    Intellectual 440 points
    hi Kaushal
    thank you very much
    In datasheet, there are three pins (SYNC_OUT,MCU_CLKOUT,TDO) that connected to the host processor with 47.5K resistors which in AWR1243boost, these pins are used as SOP header.
    If programming is to be done with SPI, Can i ignore the connection of these three pins?
    In case of cascading, If SYNC_OUT of master to be connected to SYNC_IN of Slaves as well as Master, can i ignore 47.5K resistor?
  • 0 in reply to tom daglas
    TI__Expert 7215 points
    Dear Tom,

    SOP Pins (SYNC_OUT,MCU_CLKOUT,TDO) is used to put the device in different modes such as Functional, Flash Programming etc.

    So if you need to update Flash over UART to update firmware in SFlash (only for development), You need to connect these lines to host processor. Usually there is weak pull up from host on these pins and is used only during bootup.

    In cascading mode, SYNC_OUT is later used to drive Sync Signal to slave which assumes that there is weak pull up from other path(host).

    Regards,
    Kaushal