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AM62L: How to check am62l ddr freq when running

yi wang
Prodigy 150 points
Part Number: AM62L


Hi

I want to check the DDR frequency and clock rates of the AM62L during operation

Thanks

  • +1
    TI__Guru* 88715 points

    its probably easiest to just use an oscilloscope to check the DDR CK signal.  I think the mechanism to check in linux was still in work, i will check with software team.

    Regards,

    James

  • 0 in reply to JJD
    Prodigy 150 points

    Thanks for your reply！

  • +1 in reply to yi wang
    TI__Guru**** 171821 points
    The DDR clk diagram from the ClockTree tool:
    The DDR Frequency is:
    DDR_freq = (PLL0 VCO freq / (HSDIV2 + 1))*2
    Here is an the details of using devmem2 program to directly read the SoC registers and calculate the DDR frequency.
    - Use command 'devmem2 0x04060088 w' to read the PLL0_CTRL2 register.
      It gets value '0x00008004' on the AM62L EVM. Its bit6:0 is HSDIV2, which is 4 on the EVM.
    - The PLL0 VCO freq is 2GHz, so the DDR freq on the EVM is
      (2000MHz / (4+1)) * 2 = 800MHz
     
    The register PLL0_CTRL2 information is in AM62Lx TRM, section 14.2.3.1.2.14.