• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 20 subscribers
  • Views 158 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMK00301: Output hardware configuration

Ohad Bonneh
Prodigy 740 points
Part Number: LMK00301

Hi Team, 

As far as i can see in order to configure the different outputs banks of the buffer you have to send either '1' or '0' the the designated pins. 

Since this device is the clock source for my FPGA when startup i want to make sure that the FPGA gets the clock in a predefine type. 

Is it possible to tie the inputs either to ground or to a pull-up to configure the output "manually" 

best regards 

  • 0
    TI__Genius 9250 points

    Hi Ohad,

    Yes, you can tie these pin through a pull up or pull down to set a specific output type. Pin control buffer are usually used in this case, dynamic change is occasionally used.

    Best,

    Asim 

  • 0 in reply to Asim Khan
    TI__Prodigy 740 points

    Hi Asim, 

    Thanks for the quick reply, 

    Additional issue that I'm trying to face is the following:

    Suppose I have a clock in and while system is running I want to change the clock source is it possible? 

    If so, what would be the delay by switching from one clock source to the other? (FPGA clock is one of the outputs of the lmk00301)

    Best Regards

  • 0 in reply to Ohad Bonneh
    TI__Genius 9250 points

    Hi Ohad,

    Yes, its possible. There might be a slight delay of few nanosecond before the it changes to other clock. I had a similar measurement for this case in AC coupled mode before which didn't show significant delay on this buffer.  Note that, both clock at each inputs were at same frequency.

    Below is a snap shot of that measurement.

    Best,

    Asim