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DS160PR410: DS160PR410: RX_DET, channel loss details

Nachiketh Karanth
Intellectual 520 points
Part Number: DS160PR410

Hello,

1. Can we use this IC for PCIe application by keeping RX_DET in L3 state?

2. How much boost does CTLE provide at 16GHz for PCIe 4.0?

3. How much channel loss can IC support at 16GHz for PCIe 4.0?

Regards,

Nachiketh

  • 0
    TI__Genius 11900 points

    Hi Nachiketh,

    Nachiketh Karanth said:
    1. Can we use this IC for PCIe application by keeping RX_DET in L3 state?

    RX_DET in L3 state will disable the PCIe RX detection state machine. Because the RX detection process is part of the PCIe link training protocol, my understanding is that it would be difficult to use this device for PCIe without it. This option is intended for non-PCIe protocols that do not have RX detection. Is there a particular reason why you are considering this setting?

    Nachiketh Karanth said:
    2. How much boost does CTLE provide at 16GHz for PCIe 4.0?

    This will depend on the selected CTLE/EQ setting. For PCIe 4.0, the device boosts are given in terms of 8 GHz (Nyquist frequency for 16 GHz data) in Table 1 in the datasheet. There is also a plot of typical EQ boost vs frequency for eight different EQ indices in section 6.8:

    If you need more detail, there should be a ZIP file of S-parameters representing the device operation at each EQ index available on "DS160PR410-DESIGN" My Secure Resources (if you do not have access yet, the link for the export control request is here: https://www.ti.com/drr/opn/DS160PR410-DESIGN) . They can be opened in a program such as Keysight ADS and you could generate plots of SDD21 against a range of frequencies.

    Nachiketh Karanth said:
    3. How much channel loss can IC support at 16GHz for PCIe 4.0?

    From page 22 of the datasheet, it is reasonable to expect up to 45 dB total channel loss between the root complex and endpoint when using the DS160PR410 at Gen 4.

    Best,

    Evan Su

  • 0 in reply to Evan Su
    Intellectual 520 points

    Hello Evan,

    1. How does the IC work in Active buffer mode, please provide detailed information

    Regards,

    Nachiketh

  • 0 in reply to Nachiketh Karanth
    TI__Genius 11900 points

    Hi Nachiketh,

    "Active buffer mode" means that the device does not have any considerations for protocol - it receives signals, amplifies them, and outputs them. In general, a redriver is considered a protocol-unaware device because it does not know what kind of data or protocol it is working on, but for PCIe applications it has been designed with an RX detection function to ensure that the link training process starts as expected. RX detection is a relatively simple process that checks the TX terminations and adjusts the RX terminations. For protocols like SAS, which do not use RX detection, this function should be disabled.

    Best,

    Evan Su