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How are the PCIe lanes of the JUNO system connected

Martin

Hi,

the documentation states:

  • 4 lane Gen 2.0 PCI-Express (Juno r1 and r2 only)

The JUNO system has 4 PCIe connectors:

     x16, x8, x4, x4

Does every connector have 4 independent lanes (so all together we could use 4 cards with 4 lanes each at the same time)

or are the 4 lanes shared so when we are using 4 cards only one lane is available per card?

Thanks,

           Martin

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    Hello,

    Please see the diagram in section 2.14.1 of the Juno V2M Technical Reference Manual (TRM) here.

    As shown, the PCIe lanes are configured as follows:

    • The x16 slot has 4 lanes connected
    • The x8 slot has 4 lanes connected
    • Both x4 lanes have 1 lane connected each

    This means you can have four cards/devices connected to the Juno via PCIe expansion simultaneously, however the bandwidth of those devices will be limited. i.e. you can insert an x16 sized card into the x16 slot, but it will only get x4 bandwidth because only 4 of the lanes are connected.

    I hope that helps.

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  • 0

    Hello,

    Please see the diagram in section 2.14.1 of the Juno V2M Technical Reference Manual (TRM) here.

    As shown, the PCIe lanes are configured as follows:

    • The x16 slot has 4 lanes connected
    • The x8 slot has 4 lanes connected
    • Both x4 lanes have 1 lane connected each

    This means you can have four cards/devices connected to the Juno via PCIe expansion simultaneously, however the bandwidth of those devices will be limited. i.e. you can insert an x16 sized card into the x16 slot, but it will only get x4 bandwidth because only 4 of the lanes are connected.

    I hope that helps.

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