AM3357: EtherCAT latency

Hiroyasu Tazawa1

Part Number: AM3357

Hi, Everyone

I have a question about EtherCAT for AM335/AM437x.

My customer want to know latency of between EtherCAT data input and write to internal memory for ProcessorSDK.
Do you know this information ? if you know.
I look for Wiki page and datasheet of EtherCAT in PRU-ICSS-EtherCAT_Slave_01.00.02.01.

but I do not see this information.

Best Regards
Hiroyasu

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The EtherCAT experts have been notified. They will respond here.

0 David Zaucha over 8 years ago in reply to Biser Gatchev-XID

TI__Expert 7570 points

Hi Hiroyasu-san
The time from the EtherCAT frame arriving (RX_DV goes low) to when the payload is available in the ARM application (PRU setting EDIO indicating that it has completed the processing and the ARM has received the event via GPIO toggle) is approximately 2 us. The delay does not change with the length of the Ethernet payload (because the EtherCAT firmware is handing on-the-fly packet processing).
David

0 Hiroyasu Tazawa1 over 8 years ago in reply to David Zaucha

Guru 12350 points

Hi, David

Thank you !
I got it.

Best Regards
Hiroyasu

Processors

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AM3357: EtherCAT latency