DP83TC812EVM-MC: DP83TC812EVM-MC Register Programming through USB-2-MDIO

Hello Krish,

I believe we were working on this topic already a few months ago: 

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1320209/dp83tc812evm-mc-dp83tc812evm-mc-does-this-evm-support-sfd-ieee-1588-timestamp/5144574?tisearch=e2e-sitesearch&keymatch=%2520user%253A589945#5144574

The correct programming procedure is given as well as a waveform. 

Are there any updates or other questions you had on this?

Regards,
Avtar

HI Avtar

     I have 2 EVMs and MateNet. This is a new update.

Few months ago, You said the following.

 " I used these registers: " 

Register 0452 is: 0405
Register 0452 is: 0504

Question 1 :  I am not sure why the same register (0452) need to be written with two different values. ? 

Question 2 : The following register programming does not work to transfer data between 2 PCs in the following setup.

I used the basic PING command between two PCs with the following setup.

PC1  => Ethernet cable  =>  EVM #1 =>  MATENet cable   => EVM#2   =>  Ethernet cable => PC2

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

begin

001f 8000 // restart core
0000 2100 // force 100Mbps, full-duplex
0010 5008 // 5008 - mdi , 5028 - mdix

// Set the Device to output the SFD
0172 0120

// Set the Internal SFD Configuration.
00E9 DF22

// As per the snla242 document.
//Enable enhanced receive features by writing 0x1080 to register 0x04A0
//Configure the device to output the SFD's by writing 0x0406 to register 0x0452
04A0 1080
0452  0406    //  It does not match with what you said in your last post.

// Apply Software Reset.
001F 4000

end

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Pls, Let me know what correction need to be done in the above script  to communicate between two EVMs (  DP83TC812EVM-MC )

Thanks

Krish

Hello Krish,

Question 1: In our data Sheet we have SFD for TX and RX , the registers are for TX and RX accordingly. 

Question 2 :  I see this is in the script // As per the snla242 document., As I mentioned in the prior E2E that document and script is for the DP83867 and not the DP83TC812. 

Regards,

Avtar

Hi Avtar

Let me know what correction need to be done in the  script that I sent for DP83TC812. ? 

Hello Krish,

Below are the registers you will need to configure 

Register 04A0  is  1080 (this will enable SFD detection)

Register 0452 is: 0405 (setting LED0 for SFD TX)
Register 0452 is: 0504 (setting LED0 for SFD RX)

These are the only registers needed besides the normal phy operation registers.

Regards,

Avtar

Hi Avtar

      The register programming that you pointed out the last post did not help to send the basic "ping" command between two DP83TC812 EVMs.

1. How do we set Master on EVM2 and  Slave on EVM2 ? 

I did follow the following.  

But, programming the following registers as you pointed out made the EVM boards to "hang"  

Register 0452 is: 0405 (setting LED0 for SFD TX)
Register 0452 is: 0504 (setting LED0 for SFD RX)

2. Please Send me the complete script for Master EVM and complete script for slave EVM to make this ping command from PC1 to PC2 in the following setup.

PC1  => Ethernet cable  =>  EVM #1 =>  MATENet cable   => EVM#2   =>  Ethernet cable => PC2

Hello Krish,

I am glad the master slave issue got resolved.

Can you explain what happens when the EVM boards "hang" does this mean they become non functinoal?

Also for complete script do you mean to write the ping command? If so these are related to whichever terminal you are using on your PC and you'll have to consult the PC provider. Typically in ipconfig or ifconfig you can set the ip address for both PC's and then type ping <ip address> . 

Regards,

Avtar 

Hello Krish,

I am glad the issue is resolved, please let me know if you have any further questions. 

Regards,
Avtar