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Question about 26MHz system clock

Other Parts Discussed in Thread: TPS65930

Hi,currently I am using the ccs for my EVM.
In my EVM, A TPS65930  feed a 26MHz clock as the system clock to omap. I have a question about the clock
configuration, document Spruf98 says in 4.7.2.1.2 --"The source system clock can be 12, 13, 16.8, 19.2, 26,
or 38.4 MHz and is internally divided by 2 to provide the standard frequencies (26 MHz and 34.8 MHz become
13 MHz and 19.2 MHz, respectively; the native 12, 13, and 19.2 MHz remain unchanged)."
It does not say who is resposible for doing this.

My question is: Does it means when the external clock is 26MHz  then  the sys clock  is automative divide to
13MHz?  Should I setting up the  PRM_CLKSEL[2:0] OSC_ SYS_CLK = 0x00000003,
and PRM_CLKSRC_CTRL[7:6] SYSCLKDIV = 2.

  • yuqing cai said:
    Does it means when the external clock is 26MHz  then  the sys clock  is automative divide to
    13MHz?  Should I setting up the  PRM_CLKSEL[2:0] OSC_ SYS_CLK = 0x00000003,
    and PRM_CLKSRC_CTRL[7:6] SYSCLKDIV = 2.

    That is correct.

    For an example on setting up the clocks, take a look at the GEL file located at "<CCStuido_DIR>\cc\gel\omap3430_prcm_clock_configs.gel".