DP83869EVM: Can evaluation boards(DP83869EVM) communicate with each other?

Hi Alvaro,

Thank you for your reply.

I understand. Please let me ask you a few questions.

- How do I write registers to set master mode or slave mode?

- Can 100Base-Tx or 1000Base-T be specified for intercommunication?

- Can evaluation board (EVB) communicate with PC?

Best regards,

Taka

Hi Taka,

BCI is typically an Automotive test, why do you want to do it on the 869 EVM?

Please find my responses below.

• How do I write registers to set master mode or slave mode?
  • Register GEN_CFG1, Address 0x9, bit 11 & 12
• Can 100Base-Tx or 1000Base-T be specified for intercommunication?
  • yes, but I'm not sure if I understand the question
    • Can you clarify the question a bit?
• Can evaluation board (EVB) communicate with PC?
  • Via USB2MDIO and something else?
    • Could you clarify what you expect when you say communicate?
    • Register Writes/Reads can be done through a PC via the USB2MDIO program

Regards,

Alvaro

Hi Alvaro,

Thank you for your reply.

I apologize for the lack of explanation.

Why do you want to do it on the 869 EVM?

• Because I would like to evaluate our Common-mode choke coil and Pulse-transformer. The transformer between the RJ45 and the IC is replaced with our product for evaluation. BCI is the only way where we can see the effects of EMS at my office. 

100Base or 1000Base ) Can you clarify a bit? 

• The reason for specifying the communication speed is related to the evaluation of EMI. Erequency charastaristics of radiated noise may vary depending on the communication speed.

Communicate with PC ) Could you clarify what you expect when you say communicate?

• Communication using an Ethernet cable and not a USB cable.
• If the EVBs communicate with each other, two EVBs and two PCs are required, but if they communicate with a PC and an EVB, only one EVB and one PC are needed. Therefore, the measurement environment can be simplified if the connection status can be viewed by communicating with a PC.
• Is it difficult for PC and EVB to communicate with each other since EVB does not have an OS?

I have another question.

• Is it possible to keep sending random packets on the sender side and receive them on the receiver side? At this time, the transmitter blinks the LED during transmission and the receiver blinks the LED when the packet is received. If the packet is not received, the LED will turn off. This is necessary to determine if communication is working.

Best regards,

Taka

Hi Alvaro,

Thank you for your reply.

I understand.

So, how do I write to a register to keep random signals flowing at 1000Base-T between two nodes, for example?

Best regards,

Taka.

Hi Alvaro,

Thank you for your reply.

I was able to do what I want to achive (100 or 1000Base speed configuration, Random data transfer, LED bright during data transfer).

Thank you very much.

By the way, I observed the 1000Base-T Test mode 1 waveform with an oscilloscope and the output voltage was lower than expected.
Is it possible to increase the output voltage by writing to a register?

1000Base-T Compliance test : Test mode 1 voltege results ( Pass limits 670mV < VALUE < 820mV)

• Point A Peak Output Voltage : 705.7mV
• Point B Peak Output Voltage : 701.2mV

It is within the pass limit, but close to the margin.
Is it possible to increase the voltage by about 50mV?

The following picture is the configuration of 1000Base-T Test Mode 1.

https://www.ti.com/lit/an/snla239b/snla239b.pdf

What is the 0x01D5 address for?

If this address is not set as shown in the picture, the voltage decline (705mV ==> 575mV).

Best regards,

Taka.

Hi Alvaro,

Thank you for your reply.

I understand.

Thank you for the taking time to answer the question.

Best regards,

Taka