AURIX™ Forum Discussions

[miao]

Hello,

    I enable MAC timecstamp but get tx timestamp always 0.

    Could anyone tell me how to get tx timestamp after send ptp pack over ethernet?

Thank you

[dw · Accepted solution]

Hi miao,

Attached is geth demo code for timestamp enabled.  Please refer to it.

Regards,

dw

[rpk]

I too am in the process of enabling time stamping on the Aurix TC3XX. In the example you provided I saw a comment that mentions

System Time Update logic requires a 50-MHz clock frequency to
achieve 20-ns accuracy, 50MHz clock is internal to GETH-IP

---

---

Does the mean that the PTP system clock will always update at 50MHz - i.e the System Time Nanoseconds register will accumulate the value from Sub-Second Increment register (SSINC) at 50MHz?

Is it possible to change the update frequency to a value other than 50MHz, and if so how?

[dw]

Hi rpk,

AURIXTC3XX_ts_V1.3.0.PDF

You can check 36.2.2.4 Time Stamp Error Margin and 36.2.2.5 Frequency Range of Reference Timing Clock.

dw

[rpk]

Hi dw,

Appreciate the quick response. How can I gain access to the doc you mentioned?

[dw]

Hi rpk,

Please access myICP to download below files. About the access right, also as below link.

https://myicp.infineon.com/sites/microcontrollers-aurix_customer_doc/Lists/defaultdoclib/AURIX%20TC3...

https://www.infineon.com/dgdl/Infineon-Customer_+instruction_guide_for_myICP_version_2-ATI-v02_00-EN...

dw