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DRA726: TECHNICAL SUPPORT

Colt Zhang
Expert 5490 points

Part Number: DRA726

At present we will replace J6 ECO DRA726APL2ABCQ1 to J6 DRA745BLGABCQ1 normal board, the chip will not run, we see the information below it seems that J6 and J6 Eco are compatible design.It should be possible to switch on.
1 The current phenomenon is that the main chip has been loading the data of the SD card, can measure to the CLK, CMD, D0 signal line on SDIO all the time there is data.Isn't the process of loading only once?I measured normal J6 board SDIO only once during the loading process (whether the card is inserted or not).
2 We also tried to change the BOOT boot configuration to USB EMMC boot (SYSBOOT[5:0]=000000), after the modification the SD card SDIO signal will no longer have a waveform.EMMC data on CMD and D0 energy to data (CLK runs on the inner layer and cannot be quantified).However, there is still no print information.(The EMMC has the start-up data for the previous J6).
3 We also tested the DDR clock is wavy, other signals are high, should not go to DDR this step.
4 We found a difference between the WAKE UP source for J6 eco and J6, just as our previous J6 was using WAKE UP 1, I tried to change PMIC_INT to WAKE UP3, or both WAKE UP 0 and WAKE UP 3 to low level, the phenomenon is still.Is our question now not related to WAKE??
5 accessories for the current replacement of the J 6 motherboard schematic, please help analyze whether J6 and J6 ECO are different in hardware configuration, so now BOOT is not up, thank you ~

  • 0
    Prodigy 20 points

    Today we FAE provided a document of J6Eco_pin_compatibility_v0.2 (002).pdf.  

    we have a test about the  difference of WAKE_UP ,NO work.

    About VDD_IVA , we tried to remove the power supply of VDD_IVA on J6 board, but the problem remains. no BOOT up.

    In addition, today we found that the RTC clock is no work, In  the  old design of J6 board, the RTC oscillator is NC ,and RTC_OSC_XI_CLKIN32（PIN:AE14）is pull_down to GND by 10K.  I replaced the 32.768K crystal oscillator and capacitor, and the RTC  still did no work.  This problem causes BOOT to fail???

    My sch about CLOCK  ,WUKEUP,RESET part:

    THANKS

  • 0 in reply to jijie.zhou
    TI__Guru 56407 points

    Hello,

    I recommend that you go through the ppt J6Eco_pin_compatibility_v0.2 line by line and see which of the J6 interfaces you may be using that are not on J6Eco (and vice versa).

    Regards,

    Kyle

  • 0 in reply to kcastille
    Prodigy 20 points

    thanks, We have carefully read this document，However no significant differences were found。we have some tests  as below:

    1 About the green section，J6Eco should be functional on J6 board without special handling， Nothing to do。

    2 about wakeup2 & wakeup1 ：

           frist we don‘t have a use this function。we try all wake up pins(wakeup0,wakeup1,wakeup2,wakeup3) to pull down to GND , the J6 chip can still  boot up normally。

           about J6 Eco chip ，we have some tests:

           2.1 wakeup0,wakeup1,wakeup2,wakeup3 pull down to GND

           2.2 wakeup0,wakeup3 pull down to GND, wakeup1,wakeup2 is float.

           2.3 wakeup0 pull down to GND,wakeup1,wakeup2 is float.wakeup3 connect to PMIC INT OUT.

          The above tests，NO use ，cann’t BOOT UP ,J6 ECO has been loading the data of the SD card all the time.

    3 about DDR2_*:

          We don't depopulate the ddr memories IC, It ‘s no affect about the extra memory IC.

    4 about Multiplexed function VIN3 4:

         

        This has nothing to do with the BOOT , right?

    5 about Power：

         5.1 VDD_iva:

         

          we have a try to disconnect the supply of vdd_iva ,  No effect。

         5.2 vdd_dspeve：

        The power supply  uses the same power supply as the Dspeve。

         5.3 VDD_DDR1 & VDD_DDR2

        

    This part of the power supply is connected together, so there is no way to disconnect it。

    by the way ，We want to know why the system constantly reads the SD card data during startup, instead of reading it only once？？？