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DP83TG721R-Q1: T1 Link status Register check

Gibbs Shih
Expert 5395 points
Part Number: DP83TG721R-Q1


Tool/software:

Hi, Dear Expert

We are debugging ethernet link failed issues.

Some question : 

(1) mii_reg_0 Register bit 6 / bit 8 only detect T1 cable status, so even RGMII has some issue, it can normal show T1 link status, Am I correct?

(2) mii_reg_10 Register bit 0 / bit 2 only detect T1 cable status, so even RGMII has some issue, it can normal show T1 link status, Am I correct?

Thank You Very Much

Gibbs

  • +1
    TI__Mastermind 27232 points

    Hello Gibbs,

    1. DP83TG721 only supports 1000mbps and full duplex. Bits 6 and 8 of register 0x0 are read only and will not change. Please refer to register 0x1 bit[2] for link status.

    2. Even if RGMII has some issue, normal T1 link status can still be shown in 0x10 bit[0], correct.

    Thanks,

    David