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To replace Intel obsoleted SNI mode 10M PHY chip LXT905

user4684403
Prodigy 150 points
Other Parts Discussed in Thread: DP83848I, DP83848C

Hello,

Does anyone have idea to replace LXT905 from Intel which has been an obsoleted part, TI part DP83848I seems have SNI mode function for industrial using, but the material of SNI mode operation is very limited,  does anyone have some guidance or application notes on how to implement this replacement

LXT905 has several configuration pins like PDN(power down), FDE(full duplex mode), LBK(loopback) and DSQE(SQE disable), seems DP83848I only have MDIO and MDC pins like a I^2C bus to configure the PHY internal registers, how to upgrade this part, does anyone have some idea on this?

Thanks

Dennis

  • 0
    Prodigy 150 points
    Some data from DP83848
    DP83848C/I/YB incorporates a 10 Mb/s Serial Network Interface (SNI) which allows a simple data
    interface for 10 Mb/s only system. While there is no defined standard for this interface, the interface is
    based on the earlier Texas Instruments 10 Mb/s physical layer devices. The following pins are used in SNI
    mode:
    • TX_CLK
    • TX_EN
    • TXD_0
    • RX_CLK
    • RXD_0
    • CRS
    • COL
  • 0 in reply to user4684403
    Prodigy 150 points
    Some data from DP83848
    DP83848C/I/YB incorporates a 10 Mb/s Serial Network Interface (SNI) which allows a simple data
    interface for 10 Mb/s only system. While there is no defined standard for this interface, the interface is
    based on the earlier Texas Instruments 10 Mb/s physical layer devices. The following pins are used in SNI
    mode:
    • TX_CLK
    • TX_EN
    • TXD_0
    • RX_CLK
    • RXD_0
    • CRS
    • COL

    Does that mean we don't need to use MDIO and MDC anymore for interface management configuration?
  • 0 in reply to user4684403
    TI__Mastermind 26320 points
    We recommend to use DP83822.

    Regards,
    Geet
  • 0 in reply to Geet Modi
    Prodigy 150 points
    hi Geet,

    This is another case, we have two Intel PHY chip has been obsoleted on different product, LXT905 is a 10M bit/s SNI mode PHY
    the one I talked before is LXT971, this is a MII interface PHY, it is much easier to find a replacement for this part, but it is difficult to find a viable replacement for LXT905, because we don't want to change too much for our firmware

    Thanks

    Dennis
  • 0 in reply to user4684403
    TI__Mastermind 26320 points
    What's the key care about in terms of feature on this design. Did you look at DP83822 ?

    Regards,
    Geet