DP83TD510E: DP83TD510E-EVM TX_ER question

Hello Ling,

Could you submit this question again in English? Our Translation tool isn't the best.

Regard,

Alvaro

Hi Alvaro，

Thanks for your prompt reply, please let me know if there have any miscommunication.

1.dp83td datasheet strap定义是只有一段dnp的两种mode ，但是测试板上有双端res都存在，请问是怎么回事 ？

- as the table shown above, only 2 modes for strap resistor ratio, which means DNP should be set neither at Rhi or Rlow. But in EVM's schematic, both Res was placed, which brings a confuse about the actual mode that it represented.

2.第二个问题，dp83td510e 芯片的MII模式下的tx_ER目前只在图二存在，并没有被引出到CON的管脚，可以说明为什么吗，还是MII模式目前不需要tx_ER吗？

- Tx_ER under MII mode / identify as Pin28 in dp83td510e, is not led to the J11 CON but ends as a LED net. Can you explain why it's not been connected to the edge connector, or we can ignore tx_ER while in MII mode?

Hi Ling,

Thank you for reaching back and translating your question for me. Please find my answers below.

1.  I understand your confusion here, I believe it's because LED_2 has a Jumper where you can change whether you want to PU or PD.
   1. 
   2. Found on Page 15 of the EVM User's Guide
   3. Generally speaking, do not follow the Layout on our EVMs. When in doubt, follow the Datasheet.
2.  TX_ER is optional in MII Mode, in our Datasheet we don't even mention it in Section 7.3.5 Media Independent Interface.
   1. 

Regards,

Alvaro