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changing 24Mhz crystal in Logic PD 'OMAPL138 SOM Board

somu sebastian
Prodigy 120 points

hello
As my project demands,i wish to change the crystal Y2(part number :1006395) to a crystal frequency of 18.432Mhz (of the  same vendor) . if i replace the crystal and adjust the clocking parameters(according to the .xls file provided by Logic PD to adjust clocking) i guess i would be able to generate a system clock fequency about 313.34Mhz .Well ,is there any problem in selecting such a frequency ? will it affect perfomance of my system and its supporting peripherals ? also am concerned about the digits after decimal point in the frequency generated,will these come into trouble if am willing to configure timer?

Expeceting a quick solution
Somu Sebastian

  • 0
    TI__Expert 4760 points

    Hi Sebastian,

    You can use 18.432MHz OSCIN for your project it won’t affect the system performance.

    May sure you round off the decimal value to get the HEX value to feed the PLL & other timer configuration register.

    Note:

    But you can use 24.000 OSCIN and make your PLLM Register (PLL multiplier) to 12 Decimal that is 0x0C HEX to generate 312 MHz system clock

    Please refer the advanced spreadsheet for other peripheral clocking configuration

    http://processors.wiki.ti.com/index.php/File:SYS_CLK_CALC_OMAP-L138_C674X_AM18X_v1p0.zip

    Regards

    Antony

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  • 0 in reply to Antony Samsunil
    Prodigy 120 points

    Hello Antony

    thanks for the comment and clarification . Well i would like to know one more thing, is it is  possible for generating a 9.216Mhz with the reference clock of 24Mhz? i have tried various combinations accoding to the clocking spreadsheet document. 

    Regards

    Somu Sebastian