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HD3SS3412 for SAS3 Mux

Kai Hsiao
Guru 12675 points
Other Parts Discussed in Thread: HD3SS3412, DS125MB203, DS125BR401, DS125BR401A, DS125BR111

Dear Sir

If I have SAS3 Mux requirement ,Could I use HD3SS3412 to do that ?

Thanks

  • 0
    TI__Mastermind 29655 points

    Hi Kai,

    I am unable to offer much commentary on the HD3SS3412 for SAS3 applications, but from a lookthrough of the datasheet, I was unable to find indication of support for link-training or OOB burst signaling.

    For SAS3 mux, the DS125MB203 may also be worth looking at. It is a mux/buffer equipped with EQ, VOD gain, and de-emphasis to provide additional signal conditioning if desired, and was designed to be used in applications requiring link-training.

    Thanks,

    Michael 

  • 0 in reply to Michael Lu (Santa Clara)
    Guru 12675 points

    Dear Michael

    Thanks for your reply 

    As I know ,TI SAS3 repeater DS125BR401 is changed the version from DS125BR401 to DS125BR401A ,due the linearity comparison is not good and DS125MB203 SPEC is not guarantee SAS3

    Due to DS125MB203 is very expensive ,do you have any idea about this question?

    Thanks

  • 0 in reply to Kai Hsiao
    TI__Mastermind 29655 points

    Hi Kai,

    Thanks for pointing this out. You are correct. Though the DS125MB203 can support data rates up to 12.5 Gbps, validation would need to be performed on the customer side to ensure correct operation for SAS-3.

    After looking further at the HD3SS3412, I believe since it is a generic passive switch that does not perform any equalization or signals the output to be mute/active, the HD3SS3412 can be used to Mux different SAS-3 devices. I think if you require additional signal conditioning features, you may want to add a repeater with the HD3SS3412, such as the DS125BR111 (1-lane) or DS125BR401A (4-lane). This will make a solution that is similar to the DS125MB203, but with SAS-3 support.

    I'd like to point a few things I spotted regarding the HD3SS3412 switch. The HD3SS3412 is that it is only spec'd from 0 - 70C as of the Nov. 2013 revision. You will also need to AC couple on both sides if the common mode bias voltage on either side of the switch is >2.0 V. This is particularly important if you use the DS125BR111, where the input is biased to 2.5 V on VDD.

    Thanks,

    Michael

  • 0 in reply to Michael Lu (Santa Clara)
    Guru 12675 points

    Dear Micheal

    Really thanks for your reply 

    Do you have HD3SS3412 demo board and reference schematic ,I remember TI have a application EVM that use HD3SS3412 on this EVM 

    Thanks

  • 0 in reply to Kai Hsiao
    TI__Mastermind 29655 points

    Hi Kai,

    As of now, I am not aware of any demo boards with the HD3SS3412. I will reach out to my TI counterpart in our Consumer & Computing Interface group to comment.

    Thanks,

    Michael