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TNETE2201B: TNETE2201B

Shlomi Yehezkia
Mastermind 6150 points
Part Number: TNETE2201B
Other Parts Discussed in Thread: TLK2201B

Hi Team,

I have some questions about TI chip: TNETE2201B (1.25Gbps Ethernet transceiver).

I want to use the TNETE2201B in an application that is not Ethernet.
I want to connect the TNETE2201B to a sub-LVDS SerDes driver that drives a proprietary protocol, which is based on a standard 8b/10b coding, at speeds up to 1.25Gbps.
The datasheet of the TNETE2201B talks about Ethernet protocols, so I want to make sure it can work with my custom interface.
Notice I only want to use the Rx path of the TNETE2201B, and I don't need its Tx path.
1) Does the clock recovery and data alignment block (or any other block) assumes an Ethernet protocol? For example, if I use my own initialization sequence which is made up of a repetitive sequence of the symbols K28.5-->K28.2-->D10.2-->D10.2-->D10.2, will they work well? (I understand the data alignment expects K28.5, which is ok because I have it in my init sequence).
2) Will the differential inputs of the TNETE2201B work with Sub-LVDS diff pair? (0.9V common mode) I have no problem with placing AC capacitors on the lines as the datasheet specifies, if this is the requirement.
3) If I choose to do so, can I work with <1.25Gbps data rates, assuming I provide a slower REF_CLK?.

4) Do you see any other reason this chip will not work with a proprietary protocol over sub-LVDS?

Thanks,

Shlomi

  • 0
    TI__Genius 10250 points
    Hello Shlomi,

    We will look into this and get back to you as soon as we can.

    Regards,
    Yaser
  • 0 in reply to Yaser Ibrahim
    Mastermind 6150 points

    Hi Yaser,

    I see there is a newer version of this chip called TLK2201.

    I see it is speed for 600Mbps to 1.3Gbps, so question 3 below is not relevant anymore (as I see the answer is “yes”).

    The other questions still apply.

    Thanks,

    Shlomi

     

  • 0 in reply to Shlomi Yehezkia
    TI__Genius 10250 points
    Hi Shlomi,

    In principle, I believe you can use TLK2210B with non-Ethernet protocol. You just need to make sure to satisfy the requirements outlined in the datasheet. Unfortunately, there is very limited support for these legacy devices, but I will try to provide as much information as I can find.
    Please notice that TLK2201 is obsolete and TLK2201B is what's available at this time. TLK2201B can operate from 1 to 1.6 Gbps.

    The differential inputs for TLK2201B are PECL and has an input common mode range of 1.0V to 2.25V, so it cannot be connected directly to the Sub-LVDS signal. You will need to use AC coupling as shown in Fig 11 in the datasheet. Please see the following app notes regarding interfacing different technologies:
    www.ti.com/.../slla120
    www.ti.com/.../scaa059

    Regards,
    Yaser