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DP83822IF: DP83822IF' output

user6063177
Prodigy 130 points
Part Number: DP83822IF

Please refer to Fig.1 ~ Fig3.

Fig.1 shows that it is accessed 100.5ms after reset release.

Fig.2 shows that the TD_P-TD_M signal is not output even if the TX_D0 signal is output when accessed 100.5ms after reset release. (In case of abnormality)

Fig.3 indicates that the TD_P-TD_M signal is output when the TX_D0 signal is output when accessed 10 seconds after reset release. (Normal)

Why is the TD_P-TD_M signal not output even though the TX_D0 signal is output when accessed 100.5ms after reset release?

The bootstrap settings are as follows.

Only COL is set to MODE3 (set to 100BASE-FX)

Set other defaults

24 # pin is not connected.

  • 0
    TI__Mastermind 18425 points

    Hi,

    TD-P/M is not showing idles because the link might not be established. TX_D0 is controlled by the MAC, so the MAC might be trying to send the data when link is down.

    -Regards

    Aniruddha

  • 0 in reply to Aniruddha Khadye
    Prodigy 130 points

    I have additional questions.

    1. What is idles?

    2.100BASE-FX is set, but what is the link established by?

    3.Is link established after 100.5ms after reset release?

    4. What causes link to go down?

  • 0 in reply to user6063177
    TI__Mastermind 18425 points

    Hi,

    Idles are idle signals sent by the PHY to maintain a link after link up is achieved. 

    After setting the 100BASE-FX mode, the PHY needs to be connected to another link partner which also supports 100BASE-FX. The optical transceivers should be on the same wavelength so that communication can be established.

    The link up time is not measured for the PHY as there is not requirement from the standard.

    Multiple factors can cause the link to go down. Bad cable, bad optical transceivers, cable disconnect, link partner power down, PHY reset etc.

    -Regards

    Aniruddha