TJA1120 for Timesync

xuliming2 — Tue, 19 Nov 2024 08:09:02 GMT

Hello everyone,

I have questions about 1000BASE-T1 PHY TJA1120 which support IEEE1588v2 and 802.1AS-rev 2-step timestamping.

Q1: Could TJA1120 implement the IEEE1588 timesync in hardware? Or the PTP server should also be run in software? I think if the TJA1120 support IEEE1588 protocol, the software PTP server is not necessary, the two TJA1120 could finish timesync themselves.

Q2: Does TJA1120 support to output a Pulse-Per-Second (PPS) signal for triggerring functions.

Thanks and Regards

Re: TJA1120 for Timesync

PavelL — Tue, 10 Dec 2024 11:30:19 GMT

Hello @xuliming2 ,

I apologize for the late response. I've been checking answers with application engineer.

A1: The TJA1120 supports IEEE1588. The PTP module is sandwiched between the MII/GMII interface. The module provides a 1588 digital clock implementation, transmit and receive frame parsing, Start-of-Frame detection, transmit and receive timestamp units, event timestamp unit and a Pulse-Per-Second (PPS) generator. The (g)PTP Server should run in software (MAC). Please check the TJA112x Application Note.

A2: Yes, it's called PPS_OUT. Please refer to TJA1120 Data Sheet.

BTW, new version of TJA1120's application note and data sheet have been released recently.

Best regards,

Pavel

Other NXP ProductsのトピックTJA1120 for Timesync

TJA1120 for Timesync

Re: TJA1120 for Timesync