• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 290 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

DS90UB941AS-Q1: how to set register for multiple frequency pclk

user5867979
Prodigy 10 points
Part Number: DS90UB941AS-Q1

I would like to use the 25MHz clock as an external clock input and set registers 0x56=0x01, 0x3E=0xC3, 0x3F=0x01 for multiple frequency pclk 75MHz. 

But DS90UB941AS-Q1 output pclk is 12.25MHz, it looks like pclk was divided into 1/2.

Could you please help to tell me how to set the registers to get multiple pclk 75MHz?

Thanks very much.

  • 0
    TI__Guru** 103215 points

    Hello,

    The 941AS requires that the N value be greater than the M value. This means that the external clock and not be multiplied up - only divided down. In order to achieve this clocking mode with external reference please use an oscillator that is higher frequency than the desired output clock. 

    Best Regards,

    Casey