88E1111 Ethernet PHY interface with TMS320C6474

dayalan subramani

Other Parts Discussed in Thread: TMS320C6474

Hi, In the design we have interfaced 88E1111 Marvell's ethernet PHY device with TMS320C6474. Upon initialization, the device detects the link (1000Mbps or 100Mbps) and transmit LED is also active. LInk partner (i.e. PC) receive LED is also blinking. However we could not see any data. SGMII w/o clock interface is used to interface 88E1111 with DSP. It seems to be PHY configuration issue. MDIO command interface is working without any issue. Could anybody have the required register settings for 100Mbps and 1000Mbps? 88E1111 has "PHY Specific control registers" whose details are not clear. Thanks.

over 14 years ago

0 Bill Taboada over 14 years ago

TI__Mastermind 42545 points

As a starting point please review the information in the following post. It has details on the configuration of the SGMII link. It may be that that SGMII negotiation is not completing correctly.

http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/439/p/111108/401696.aspx#401696

0 dayalan subramani over 14 years ago in reply to Bill Taboada

Prodigy 50 points

Thanks for your input Bill. While checking for EMAC-SGMII auto negotiation, we found a difference between the DSP EVM and our design and solved the problem. In the EVM SGMII_TXP/N are swapped and to account for this polarity reversal, TX_CFG INVPAIR is enabled. Since we have been using a same SGMII configuration, all the input bits to the PHY are reversed and transmission was not happening. Upon correcting the TX_CFG-INVPAIR to normal polarity Ethernet is working fine.

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88E1111 Ethernet PHY interface with TMS320C6474