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OMAPL138 How to calculate Max PLL Lock Time

Other Parts Discussed in Thread: OMAPL138

OMAPL138 data manual(SPRS586C) page 92 explains that Max PLL Lock Time is calculated as follows.

PLL Max Lock Time = (2000 x N)/root(m)
where N = Pre-divider Ratio
      m = PLL Multiplier


Q1:
When the PREDIV = 0x8001(RATIO=1), which value should I use for "N", 1/2 or 2 ?

Q2:
When the PLLM = 0x001E, which value should I use for "m" , 31 or 32(decimal) ?

Regards.

 

  • Hi Toshio

    Toshio said:
    Q1:
    When the PREDIV = 0x8001(RATIO=1), which value should I use for "N", 1/2 or 2 ?

    2

    Toshio said:

    Q2:
    When the PLLM = 0x001E, which value should I use for "m" , 31 or 32(decimal) ?

    31 (PLLM= 0x1E(h)= 30, PLL multiplier value = PLLM+1)

    You have to use the actual value for pre div and multiplier value not the value programmed in the registers.

    Regards

    Mukul