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Forum Post: Am335x at 19.2 MHz

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We want to use an Am335x with a 19.2MHz oscillator.  How are integer values for Core, MPU, DDR, Peripheral, and Display PLLs configured from 19.2MHz?  Bootloaders (u-boot, IDK) and BeagleBoneBlack .gel files appear to use only the integer part of the oscillator frequency to divide down to 1MHz and multiply back up to the desired PLL frequency.  Doesn't this give a slightly higher value than desired at 19.2MHz?  Example for 400 MHz DDR:

DDR PLL (programmed):  int(19.2) / 19 * 400 =  400 MHz

DDR PLL (actual):  19.2 / 19 * 400 =  404 MHz

Thanks.


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