TIDA-00427: TIDA-00427, DS280BR820

Kostas Papouis

Part Number: TIDA-00427
Other Parts Discussed in Thread: DS280BR810

Hi,

I have been analyzing the TIDA-00427 100GbE/40GbE/10GbE QSFP28 Signal Conditioner Reference Design.

My question is regarding to the EEPROMs of the QSFP+ cables which are connected to the PCB(TIDA-00427) shown in the following block diagram.
What will happen if the EEPROMs of the QSFP+ cables at the TIDA-00427 side are not read? Will it impact the link training? Assuming that the EEPROM at the InfiniBand module end is read.

Thank you!

Best Regards,
Kostas Papouis

over 8 years ago

0 Liang Liu1 over 8 years ago

TI__Intellectual 870 points

Hi Kostas,

I do not think that is going to impact link training.

According to my understanding, the EEPROM inside the cable is just for storing the message or offering the status, not for configuring anything.

Regards

Liang

0 Kostas Papouis over 8 years ago in reply to Liang Liu1

Prodigy 220 points

Hi Liang,

Thanks for your answer!

So if i do not control the I2C bus to read or wirte to the two EEPROMs of the cables connecting to the PCB(TIDA-00427), will i be able to establish communication between the two InfiniBand modules?

Thank you!!

Best Regards,
Kostas

0 Liang Liu1 over 8 years ago in reply to Kostas Papouis

TI__Intellectual 870 points

Hi Kostas,

As mentioned above, the EEPROMs inside the cable will not impact link training.

However, there is the good chance you need to tune the settings of DS280BR810 devices on the board, so that the link will be up.

Regards
Liang

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TIDA-00427: TIDA-00427, DS280BR820