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TMS570LC4357: How to set VCLK3 to 100MHz?

li xy
Intellectual 355 points

Part Number: TMS570LC4357

Hi all:

    I want to change the frequency of VCLK3. The maximum value for vclk3 is 110MHz, in this case, I think 100MHz is available.

    I find that the VCLK3 is generated by HCLK divider. In my mind, the minimum frequency division of HCLK is HCLK/1 which means VCLK3 = HCLK but "VCLK3 = HCLK" is illegal. If HCLK/2, the VCLK3 will be much less than 110MHZ.

    How could I get the 100MHz for VCLK3?

Best Wish

Li

  • +1
    TI__Guru**** 200276 points

    Hi,

    VCLK3 = HCLK / n (n=1:16), up to 150 MHz

    HCLK = GCLK / n (n=1:4), up to 150 MHz

    and 

    GCLK is up to 300MHz

    So you can get VCLK3=100MHz in the following cases:

    1. GCLK=300MHz, HCLK=GCLK/3=100MHz, VCLK3=HCLK/1 = 100MHz

    2. GCLK=200MHz, HCLK=VCLK3=GCLK/2=100MHz

    3. GCLK=100MHz, HCLK=VCLK3=GCLK/1=100MHz