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Frequent questions

  • [FAQ] DP83TD510E: Can we use a transformer instead of Capacitor for AC coupling on the MDI side for DP83TD510?

    Part Number: DP83TD510E Yes, transformer can be used for filtering out the DC signal when the data is passing through the MDI side. In fact, we use transformer to filter out the AC signal in the Power over Data Line (PoDL) application. Here are the…

  • [FAQ] What is the difference between RMII slave signaling and RMII master signaling?

    RMII slave signaling is connecting 50MHz Crystal to two XI pin of the PHY and/or MAC RMII master signaling is connection 25MHz Crystal to one Master and provide a 50MHz reference lock through REF_CLK pin to the XI pin of the slave side. Slave side does…

  • [FAQ] DP83TC812R-Q1: How can I connect PHYs back to back over RMII?

    Part Number: DP83TC812R-Q1 There are two type of mode that RMII can support: RMII normal mode and RMII Repeater mode: RMII normal mode is also known as MAC to PHY RMII connection. This mode is set as default mode in DP83TC812 so it did not need…

  • [FAQ] DP83TC811S-Q1: Why is Slave/Managed mode PHY linking up with Master/Autonomous PHY link partner?

    Part Number: DP83TC811S-Q1 Other Parts Discussed in Thread: DP83TC811R-Q1 When using DP83TC811S-Q1 (or DP83TC811R-Q1), and setting the PHY into managed mode as a slave device via bootstrapping settings, if this device is connected to a master link partner…

  • [FAQ] DS90UH949-Q1: Disable HDCP to work with UB Deserializer

    Part Number: DS90UH949-Q1 Hello, My customer would like to use DS90 UH949 -Q1 devices in place of the DS90 UB949A -Q1 to keep production running. In reviewing the details they have the following questions. Can the HDCP function be disabled? If…

  • [FAQ] Why am I getting "clause-45 not supported" and "error-95" errors with PHY drivers?

    Possible reason can be : - "phy_read_mmd" and "phy_write_mmd" are not supported in your kernel version (if version is old). Possible solution to be evaluated : - Change "phy_write_mmd" to "phy_write_mmd_indirect" function and do the corresponding…

  • [FAQ] DS90UB960-Q1: BIST Duration

    Part Number: DS90UB960-Q1 Hi Team, What is the recommended duration to run the BIST? Thanks Reed

  • [FAQ] How to select correct RGMII delay mode for PHY and MAC?

    RGMII standard asks for the introduction of delay in the clock (RX_CLK/TX_CLK) with respect to the respective data (RX_D*/RX_CTRL or TX_D*/TX_CTRL). This delay can be introduced at the source of the clock or at the receiver side. Following table should…

  • [FAQ] How to select the crystal's ppm specification for an Ethernet system?

    Other Parts Discussed in Thread: DP83TC811 Ethernet data travels effectively from one MAC to another MAC with two Ethernet PHYs in between. Each of these 4 ICs can have their own reference clocks and crystal attached to each is the usual source of this…

  • [FAQ] DP83867IR: DP83867 digital loopback fail, how to set MII and PCS loopback

    Part Number: DP83867IR Hi Team: Customer side need our help to find the root cause of DP83867 Communication failure issue from one failed board . could you please help to take a look at the attached , customer need to know How to enable MII and PCS…

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