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miao
Level 1
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10 sign-ins 5 replies posted First reply posted

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

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Di_W
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Hi miao,

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

Regards,

dw

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Di_W
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500 solutions authored 1000 replies posted 250 solutions authored

Hi miao,

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

Regards,

dw

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rpk
Level 1
Level 1
First reply posted Welcome!

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?

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Di_W
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500 solutions authored 1000 replies posted 250 solutions authored

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

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rpk
Level 1
Level 1
First reply posted Welcome!

Hi dw,

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

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Di_W
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500 solutions authored 1000 replies posted 250 solutions authored
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