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LVCP114 pass through

Terry Wu
Expert 1680 points
Other Parts Discussed in Thread: SN65LVCP114

Dear Sir,

I have two question about this chip.Wish can get expert's suggestion . TKS !

- How many stage of LVCP114 can be pass through within 10G XFI .

 We test that only one stage is OK. The second stage's output that eye pattern was closed.

Any parameter can be tuning ?

- What's AGC_loop means ?

  • 0
    TI__Mastermind 20820 points

    Hi Terry,

    AGC is the Automatic Gain Control feature of the SN65LVCP114. Its goal is to make sure that all the in-to-out paths within the device have a precise and well-controlled gain. This helps minimize any variation across temperature and voltage.

    For your other question could you please elaborate on what is meant by "stage of LVCP114"? Are you speaking passing a 10G XFI signal through multiple devices?

    Regards,

    Mike

  • 0 in reply to Michael Peffers
    Expert 1680 points

    Dear Peffers,

    - In your experience. Can 10G XFI  signal be passed through 2~6  pcs of LVCP114 ?

    - If eye pattern can't open, what parameter wh should to adjust on LVCP114.

    TKS !

  • 0 in reply to Terry Wu
    TI__Mastermind 20820 points

    Hi Terry,

    The SN65LVCP114 can handle 10G XFI signal as its defined limits are within the operating range of the part.

    - In your experience. Can 10G XFI  signal be passed through 2~6  pcs of LVCP114 ?

    In theory yes, you can pass a 10G XFI signal through 2-6 pieces of the SN65LVCP114. In doing this though care needs to be taken in the design because the SN65LVCP114 is a "channel equalizer" not a jitter cleaner. There is a a certain amount of equalization that cannot be turned off so if these devices are cascaded together to implement the switch capability of the device without introducing any loss most likely the eye will become over equalized and distorted.

    - If eye pattern can't open, what parameter wh should to adjust on LVCP114.

    To initially start tuning the link I would start with VOD high (1200mV), Gain Bit set high, and Eq set to 0 which corresponds to ~1.3dB of gain. Figure 15 in the data sheet gives a good representation of what to expect from the different device settings. I recommend using this as a guide when attempting to figure out the optimal setting for the system.

    Regards,

    Mike