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Boot settings for PLL

dave k
Intellectual 305 points


Looking at the documentation it appears from the schematics that the Input Clock Frequency is set to 100 MHz.  Looking at the TMDXEVM6657 document on page 49 it appears the default setting is 66.67 MHz Input Clock Frequency (SW5 setting 001 for 13-11).  The software notes 100 MHz as the default Input Clock Frequency.  I was wondering which is correct.

  • 0
    TI__Mastermind 30825 points

    The Default bootmode is set to I2C (SW3 Pins 5-2 = bootmode[3:0]) is 0101 or 5, which is I2C.  In I2C bootmode, bootmode[12:10] are used for I2C mode and address pins, and are not for input as to what the clock mode is on the device.  Instead the I2C ROM should be programming the PLL.

    The CORE_CLK input on the EVM is 100MHz and the default pin settings shown are correct.

    Best Regards,
    Chad