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DP83TC814R-Q1: Confirm LINK Up/down live status and link down history

Part Number: DP83TC814R-Q1

Tool/software:

Hello Expert,

Our customer want to confirm following two PHY status over SMI.

  1. Live status of Link up/down
  2. History of Link down(whether PHY has faced link down condition from power-up or reset or initialization or etc...)

This is because we understood link up/down condition can be confirm over INT and LED0/1 but we want to confirm about whether we can monitor LINK up/down condition only by polling SMI. 

Then could you please answer following questions?

①LinkUp/Dwnstatus(LIVE)
Is live link up/down status showed by BMSR Register (Address = 1h) bit2

②Which following register showing the history of LINK down?
MISR1 Register (Address = 12h) bit13+bit5 ?
MISR3 Register (Address = 18h) bit14+bit6 ?
TC1_CFG_RW Register (Address = 560h) bit7 ?
TC1_LINK_FAIL_LOSS Register (Address = 561h) ?

Best regards,
Kazuki Kuramochi

  • Hi Kazuki-san,

    ①LinkUp/Dwnstatus(LIVE)
    Is live link up/down status showed by BMSR Register (Address = 1h) bit2

    Yes, 0x1[2] 

    ②Which following register showing the history of LINK down?
    MISR1 Register (Address = 12h) bit13+bit5 ?
    MISR3 Register (Address = 18h) bit14+bit6 ?
    TC1_CFG_RW Register (Address = 560h) bit7 ?
    TC1_LINK_FAIL_LOSS Register (Address = 561h) ?

    0x561[15:10] Indicates the number of link losses since the last power cycle.

    Best regards,

    Melissa