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PLL question

andrefso
Prodigy 185 points
Other Parts Discussed in Thread: OMAP-L138

Sorry about the newbie question, but where do I find informations or a block diagram about clock PLL signs?

I'd like to know what frequencys PLL provides to the timer, PHY, memories, etc...

 

Thanks

BR

André

  • 0
    TI__Genius 14545 points

    Andre-

    André said:
    where do I find informations or a block diagram about clock PLL signs?

    The majority of the higher level information you will need is found in the OMAP-L137 System Reference Guide or the OMAP-L138 System Reference Guide, depending on which device you are using, however the device specific information (such as frequency requirements) can be found in the respective OMAP-L1x datasheets.

  • 0 in reply to dabuan
    Prodigy 185 points

    Drew,

     

    Thanks for your responde... I'm using OMAP-L138....

    Actually, my problem is not the architecture, but the operating frequencies of each item... Reading the datasheet, I just found the frequency range of each peripheral.... What i intend to kwno is, for example, witch output provided by PLL is used in the timer... It is a very low level question...

    In the peripheral's datasheet, everything is in function of the clock, but in nowhere that i searched is said that timer recieves the "SYSCLKn" PLL output...

     

    BR

    André

  • 0 in reply to andrefso
    TI__Genius 14545 points

    Andre

    André said:
    In the peripheral's datasheet, everything is in function of the clock, but in nowhere that i searched is said that timer recieves the "SYSCLKn" PLL output...

    I understand your frustration. Unfortunately as silicon becomes increasingly more integrated, managing the amount of information that is needed for a engineer to configure / design with a device becomes increasingly difficult. If the information for the OMAP-L138 was contained within a single datasheet, it would be well over 1000 pages long and subsequently would require a very long download time over the web.

    In order to help simplify the silicon, the information about the chip is broken down into multiple documents.

     - The device variant specific information such as electrical / timing information as well as the memory map can be found in the respective device data sheets. I've included a link to the OMAP-L138 Datasheet for your reference.

     - The CPU cores have their own respective user guides.

     - The system level (i.e. how the peripherals are connected) will not be in the peripheral specific user guide. I believe what you are looking for is Chapter 7 of the OMAP-L138 System Reference Guide. Specifically Table 7-2.

     - The peripheral specific information, is found in the respective peripheral user guides.

     

    It's easier to think of the documentation for these devices in terms of layers rather than one all encompassing document. Does this help?

     

     

     

  • 0 in reply to dabuan
    Prodigy 185 points

    Drew,

     

    Drew Abuan said:

     - The system level (i.e. how the peripherals are connected) will not be in the peripheral specific user guide. I believe what you are looking for is Chapter 7 of the OMAP-L138 System Reference Guide. Specifically Table 7-2.

     

    That is exactly what i was looking for. There is a lot of necessary documentation, so we get lost some times, do not knowing where to look for....

     

    Thanks a lot for your help....

     

    br

    André