DP83869HM: Does the DP83869HM SGMII comply with the CISCO standard?

Hi User,

The DP83869HM does support SGMII. However, the DP83867CR does not support SGMII.

Best regards,

Melissa

Hi Melissa

I understand that DP83869HM supports SGMII.
Please let me know if it complies with Cisco's standards as electrical standards (VO, VI) for SGMII.
Also, I understand that DP83867CS does not support SGMII, but the datasheet says it does.

SNLS504D – OCTOBER 2015 – REVISED NOVEMBER 2022

Hi User,

Yes, we do support it. Also, I made a mistake and misread the part #, the DP83867CS does indeed support SGMII.

Best regards,

Melissa

Hi Melissa

The following questions have not been answered.
Please answer them.

Questions
Does The DP83869HM comply with Cisco standards as SGMII electrical standards (VO, VI)?

Hi User,

Yes, we do support it.

Best regards,

Melissa

The following is an excerpt from the DP83869HM data sheet.
Is the electrical standard indicated by the red box SFP (1000Base-X/100Base-FX)?

The SGMII input standard for the DP83867 is shown at
e2e.ti.com/.../dp83867is-dp83867is-dp83867is-sgmii-dc-specification

Question
Is the input standard for SGMII of DP83869HM the same as that of DP83867?

Hi User,

The image you posted shows the correct input SGMII specs. For the DP83869, the minimum input SGMII VOD threshold (differential-peak) is 100 mV like the DP83867.

You may use the same SGMII UI specs for the 867 and 869 as shown from the image in the post you linked:

Best regards,

Melissa

HI Melissa.

I understand that DP83869 and DP83867 have the same SGMII standard.
Please let me also confirm the electrical standard on the output side of SGMII for DP83869.

Question
Is the following the correct electrical standard for the output side of the SGMII of DP83869?e2e.ti.com/.../dp83867is-dp83867is-dp83867is-sgmii-dc-specification

Hi User,

Yes. The important SGMII spec to focus on is the hexagon of the eye. As long as your eye does not intersect with the hexagon, the signal is valid.

Best regards,

Melissa

Hello,

Thank you for your post. The US offices are closed 7/4/23 for Fourth of July holiday. Melissa will respond upon her return 7/5/23.

Sincerely,

Gerome

Hi User,

user6377398 said:

Question 1

If the DP83869HM is used facing each other, can it not be used because the output voltage is less than the input voltage?

You can connect two DP83869HM facing each other on the SGMII side. There is some attenuation from the output to the input, which is why there is a difference between the two specifications. 

user6377398 said:

Question 3

You haven't answered the very first question. I ask again.

Does the DP83869HM comply with CISCO's SGMII standard?

Yes, as I mentioned in the threads above, the DP83869 does support the standard.

user6377398 said:

Question 2,

Is 100mV (±50mV) diff correct for the minimum value of point B?

Yes.

Best regards,

Melissa

HI Melissa.
I have read over the answers and which one is more accurate?
Question.
Is the minimum received differential voltage ±50 mV? Or ±100 mV?

Hi User,

The eye diagram depicts the minimum difference in voltage - 100 mV. However, the actual minimum and maximum values are -50 and +50.

Best regards,

Melissa

HI Melissa. I agree about the minimum input voltage for SGMII.
we would like to suggest The datasheet for the DP83869HM defines the input voltage as
・1000base-X/100base-FX (SFP_MSA)
・SGMII (CISCO standard)
I would like you to write each item separately.