DS32EL0124: Can this device be used in 2.5G SGMII Ethernet Applications?

Joachim Mueller

Prodigy 25 points

Part Number: DS32EL0124
Other Parts Discussed in Thread: DS32ELX0421

There was a thread about issues in a 1000BASE-X test setup, without a resolution shown.

Is this device able to receive 2.5G SGMII signals?

11 months ago

0 Nasser Mohammadi 11 months ago

TI__Guru* 93670 points

Hi Mueller,

Typically DS32EL0124 is used with DS32ELX0421 serializer. This is because there is in-band signaling for data frame boundary and synchronization purpose. It could be possible to use these two devices for this application however i haven't come across such a customer design at the moment.

Regards, Nasser

0 Joachim Mueller 10 months ago in reply to Nasser Mohammadi

Prodigy 25 points

Hi Nasser,

thanks for the hint. I don't find any information about the in-band signaling in the datasheets, but it seems very important to know about.

Where can I find more details, please?

Regards, Joachim

0 Nasser Mohammadi 10 months ago in reply to Joachim Mueller

TI__Guru* 93670 points

Hi Joachim,

This part is one of the National channel link serializer/deserializer family part. In order to align on word bounday this in-band signaling was used. However, this is not public info about this since it is mainly used between these two devices.

Regards, Nasser

0 Joachim Mueller 10 months ago in reply to Nasser Mohammadi

Prodigy 25 points

Hi Nasser,

reading the datasheet again I seem to understand that in-band signaling is not used when "Remote Sense" and "DC Balancing" are disabled?

Regards

Joachim

0 Nasser Mohammadi 10 months ago in reply to Joachim Mueller

TI__Guru* 93670 points

Hi Joachim,

Your understanding is correct. Disabling remote sense and especially DC balance is not recommended and typically device is not used in this mode. DC balance ensures that incoming data has proper frequency bandwidth/content and thus data is sampled/processed correctly.

Regards,Nasser

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DS32EL0124: Can this device be used in 2.5G SGMII Ethernet Applications?