Post Go back to editing

power up sequence in Blackfin

In my BF533 board, I used 2 seperate power supplier chips, one for 3.3V and one for 1.2V.
1.2V is available for Vint, about 3ms before 3.3V is available for Vext. Then Reset signal is provided to boot BF533, but I always found that BF533 could not give out CS signal, and could not boot from external Flash then,unless I reprovide the Reset signal(That is , at least 2 Resets are needed).
I've tried to provide 3.3V at first, then 1.2V. BF533 could boot correctly after provide one reset signal, no need to reprovide the reset signal.
I've checked all signals: RESET, NMI, BMODE0-1 using osciloscope, and there's no abvious noise, and all signals seem correct.
I saw someone has also asked similar questions on BF52X,the answers are all that there's no limitation about power provider sequence. Have someone ever provided Vint before Vext and booted successfully?

Parents
  • Hi BobK and other DSP supports , 
     
    I uses two ADP2118 eval boards to support 1.2V and 3.3V for ADSP-BF533 eval board. Below is our test results :
     
    1.        The 3rd pink wave is the “ SYSCLK” output . The 4th green wave is the DSP “ /RST” input .  Current “ SYSCLK” is common output for well work .  The common “ SYSCLK” output is 54.19Mhz . 
     
     
    2.        The 3rd pink wave is the “ SYSCLK” output . The 4th green wave is the DSP “ /RST” input .  Current “ SYSCLK” is wrong output when DSP can’t work well . Currently “ SYSCLK” output is 22.51 Mhz . The “ SYSCLK” is not same frequency each time when DSP fails . The frequency is not change over time.
     
     
     
    3.        The 1st yellow wave is 1.2V power up . The 2nd blue wave is 3.3V power up.  When VDDEXT follows VDDINT, I can find BF533 work well . The 1.2V start-up time is around 3ms. 
     
     
    4.        The 1st yellow wave is 1.2V power up . The 2nd blue wave is 3.3V power up.  When VDDEXT power up simultaneous with VDDINT, I can find BF533 work well . The 1.2V start-up time is around 4ms.
     
    5.        The 1st yellow wave is 1.2V power up . The 2nd blue wave is 3.3V power up.  When VDDINT follows VDDEXT and 1.2V start-up time is less than 2ms., I can find BF533 work well .
     
    6.          The 1st yellow wave is 1.2V power up . The 2nd blue wave is 3.3V power up.  When VDDINT follows VDDEXT and 1.2V start-up time is more than 3ms., I can find BF533 work fails.
     
     
    So , same with my old reports, I can find the DSP power supply issue during BF533 design in our ADSP-BF533 eval board. Pls ADI DSP team offer this technical support to me asap.  You can test it in BF533 eval board and ADP2118 eval boards . 
     

    During VDDINT power-up sequence if VDDEXT not present, Blackfin core run into dead-lock state regardless /RESET until you next /RESET sequence?

     
    Angus
     
     
Reply
  • Hi BobK and other DSP supports , 
     
    I uses two ADP2118 eval boards to support 1.2V and 3.3V for ADSP-BF533 eval board. Below is our test results :
     
    1.        The 3rd pink wave is the “ SYSCLK” output . The 4th green wave is the DSP “ /RST” input .  Current “ SYSCLK” is common output for well work .  The common “ SYSCLK” output is 54.19Mhz . 
     
     
    2.        The 3rd pink wave is the “ SYSCLK” output . The 4th green wave is the DSP “ /RST” input .  Current “ SYSCLK” is wrong output when DSP can’t work well . Currently “ SYSCLK” output is 22.51 Mhz . The “ SYSCLK” is not same frequency each time when DSP fails . The frequency is not change over time.
     
     
     
    3.        The 1st yellow wave is 1.2V power up . The 2nd blue wave is 3.3V power up.  When VDDEXT follows VDDINT, I can find BF533 work well . The 1.2V start-up time is around 3ms. 
     
     
    4.        The 1st yellow wave is 1.2V power up . The 2nd blue wave is 3.3V power up.  When VDDEXT power up simultaneous with VDDINT, I can find BF533 work well . The 1.2V start-up time is around 4ms.
     
    5.        The 1st yellow wave is 1.2V power up . The 2nd blue wave is 3.3V power up.  When VDDINT follows VDDEXT and 1.2V start-up time is less than 2ms., I can find BF533 work well .
     
    6.          The 1st yellow wave is 1.2V power up . The 2nd blue wave is 3.3V power up.  When VDDINT follows VDDEXT and 1.2V start-up time is more than 3ms., I can find BF533 work fails.
     
     
    So , same with my old reports, I can find the DSP power supply issue during BF533 design in our ADSP-BF533 eval board. Pls ADI DSP team offer this technical support to me asap.  You can test it in BF533 eval board and ADP2118 eval boards . 
     

    During VDDINT power-up sequence if VDDEXT not present, Blackfin core run into dead-lock state regardless /RESET until you next /RESET sequence?

     
    Angus
     
     
Children
No Data