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DP83849 extend mode

Soccer Wang
Prodigy 500 points

Hi,            

               I am Soccer Wang who is the account FAE of Suzhou KEDA. As I searched the DP83849 issue on the E2E, it shows that you are an expert of DP83849. May you help to take a look at below question, thanks.

               Now my customer is using the DP83849 extend mode, as shown in datasheet, DP83849 should be forced in full duplex mode when in extend mode. So, will it work when configured in auto-negotiation ? Also, could you give any suggestions about the configuration of DP83849 in extend mode ?

               Thank you very much.

  • 0
    TI__Mastermind 31600 points
    Soccer,

    Autonegotation can be used with Extender mode, but the key is that both ports of the DP83849 must operate at the same speed (10M or 100M) and both ports must be in full-duplex. To configure this functionality, the Auto-Negotiation Advertisement Register (ANAR), address 04h, should be configured to advertise only 100BASE-TX Full Duplex Support or configured to advertise only 10BASE-T Full Duplex Support. The advantage of using Autonegotiation with Extender mode is that Auto-MDIX can be used to handle straight or crossed cables.

    For example, to configure the device to advertise only 100BASE-TX full duplex support, you only need to set ANAR bit 8 as 0x1 and set ANAR bits 7, 6, and 5 to 0x0. To configure the device to advertise only 10BASE-T full duplex support, you only need to set ANAR bit 6 as 0x1 and set ANAR bits 8, 7, and 5 to 0x0.

    Patrick