DP83640: PPS function consult

Lin_Charles

Part Number: DP83640

Hi team,

My customer is curious about the PPS function. The output PPS signal is on the rising or falling edge corresponding to the whole second clock inside the PHY? Thanks.

over 4 years ago

0 Aniruddha Khadye over 4 years ago

TI__Mastermind 18425 points

Hi Lin,

How is this information going to be used in the application? Currently we do not specify if the PPS output is generate on rising or falling edge of the internal clock. However, this will be same for all DP83640 so that the PPS output will behave the same between device to device. The synchronization will not be affected.

-Regards

Aniruddha

0 Lin_Charles over 4 years ago in reply to Aniruddha Khadye

TI__Expert 4260 points

Hi Aniruddha,

Thank you for your help here. My customer needs to know which edge (rising or falling edge) of the PPS signal stands for the whole second output? They need to do synchronization of two different PHYs in one terminal. Thanks.

0 Aniruddha Khadye over 4 years ago in reply to Lin_Charles

TI__Mastermind 18425 points

Hi Charles,

The rising edge of the PPS output signal should be used as an indication that 1 second has passed. We recommend a similar strategy in our synchronization apo note: http://www.ti.com/lit/an/snoa548a/snoa548a.pdf

In the App note, the PHY relies on the PPS output of the GPS receiver and uses the rising edge. Same strategy can be used when PPS signal is generated as output of the PHY.

-Regards

Aniruddha

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DP83640: PPS function consult