09-21-2019 06:31 AM
I'm using Spartan 6 device with LX9 part number. I have two signals :
The first one has 195.3125 MHZ frequency with 50% duty cycle.
The secend one is unknown. we don't know it's frequency and duty cycle.
Here is the issue : How can i understand that both rising edges are align?
Imagin that i'm shifting the first one and i want to understand whether the rising edges are align or not.
09-21-2019 06:51 AM
09-21-2019 08:18 AM
Ok , i try to explane it ...
I have a signal with 195.3125 MHZ frequency and 50% duty cycle. I made it in my spartan 6 divice (inside it). I am able to shift this signal forward every 25ps (1 step = 25ps , 2 step=50ps , 3 step=75 ps ....).
I want to align the rising edge of this signal with another one which comes from outside and i don't know it's frequency and duty cycle. By shifting the first signal , i want to synchronize the rising edge of first signal with the secend signal.
So, imagin that i shift the first signal , 3 step (3*25=75ps), How can i understand that both rising edges are synchronize (or align) ? How can i detect this ?
09-21-2019 08:36 AM
09-21-2019 08:55 AM - edited 09-21-2019 08:56 AM
I made it with DCM . See UG382 , chapter 2 .
What is difference between "phase frequency detector" and "phase detector" ?
I know that we use "phase detector" when both signals have a same frequency.
09-21-2019 09:57 AM