DP83TC811S-Q1: TDR test enable procedure for DP83TC811S-Q1

Hi Cecilia,

Thanks for you feedback. Customer follow the procedure, but they also can't get the result. Could you check it for customer? Thanks.

There are other 3 actions of TDR test. Customer followed the step, here is the action and result:

STEP1: The 1^st requirement is changing the Master mode to Slave, and changing the slave mode to master freely.

According to file of DP83TC811,which is screenshoted below,if the PMA_CTRL Register(0x0834) of the phy is wrriten to 0xC000, The phy should be a MASTER mode. If the same register is wrriten to 0x8000, the phy should be a SLAVE mode.

Test result: The real test result is that the phy gets 0x0000 all the time,however, the mode can NOT be changed at all.

 Step 2: The 2nd requirement is entering and exiting the test mode.

According to file,which is mentioned above,if the TEST_CTRL_Register(0x0836) is wrriten to 0x2001, 0x4001,0x8001 or 0xA001; the phy will enter Test Mode 1,Test Mode 2,Test Mode 4 or Test Mode 5.

Test Result: The real test result is that the phy gets 0x0000 all the time,however, the test mode can NOT be changed at all

STEP 3: The 3rd requirement is about TDR.

According to file named snla291.pdf,whose internet connection is show below, we will get TDR result after several operation steps .

http://www.ti.com/lit/an/snla291/snla291.pdf

Test Result of log:

It shows that the result of Reg[0x016B]=0x02c8,which means the bit[8] = 0.

However,the 2n step is short the twisted wire.It is NOT correct.

BR

Songzhen Guo

Hi Songzhen,

Let us first try to isolate the issue to reading and writing into reg 0x834 for Master or Slave mode since we are unable to even do that.

Before you even write into the registers, can you read it? Will it still read 0x0000 before your write?

Also, in your steps you have written down did you mean to say write reg <000D> = 0x401F and NOT write reg <000E> = 0x401F

Because you will need to write 0x401F to register 0xD NOT 0xE.

If the board is also strapped to either master or slave mode you can read these values on Reg 0x467 as well

Thanks,

Cecilia

Hi Button,

Thank you for the clarification. I believe there may be an issue with the read and write functions if you are unable to read reg 0x834 and 0x467. Can you please try reading even the non extended registers such as registers 0x0 and 0x1? Then try reading the extended registers beyond 0x1f?

Thanks,

Cecilia

Hi Cecilia,

       It looks like for the extended registers you are writing 401F however, register 0x834 is in MMD1 Field and you will need to write 4001 NOT 401F

       Here are the new logs about reading reg<0x0834>=0x0000,

which are the same as before. And the debug result is NOT what we want.

(Read reg<0x0834>=0x0000)

/ # echo 0x000D 0x001F> /sys/class/net/eth0/device/phy_regnum            (Write reg<0x000D>=0x001F)
echo 0x000D 0x001F> /sys/class/net/eth0/device/phy_regnum
/ # echo 0x000E 0x0834> /sys/class/net/eth0/device/phy_regnum             (Write reg<0x000E>=0x0834)
echo 0x000E 0x0834> /sys/class/net/eth0/device/phy_regnum
/ # echo 0x000D 0x4001> /sys/class/net/eth0/device/phy_regnum             (Write reg<0x000D>=0x4001)
echo 0x000D 0x4001> /sys/class/net/eth0/device/phy_regnum
/ # echo 0x000E> /sys/class/net/eth0/device/phy_regnum
echo 0x000E> /sys/class/net/eth0/device/phy_regnum                                (Read reg<0x0834>)
/ # cat /sys/class/net/eth0/device/phy_regnum
cat /sys/class/net/eth0/device/phy_regnum
0x0000                                                                                                           (Show the value of reg<0x0834>)

I'm puzzled that :

     Wether my operration is OK or not okay?

Hello,

When you say that when you try writing 0x0009 = 0000 to disable and it "does not work" can you explain what you mean by that? Are you saying that the register values do not change? 

One test we can try instead of writing 0x0009 for the auto-run, can you please try writing 001E to manually start TDR then you will be able to see if the measurement is complete. 

Another item you can try so that you can avoid restarting the hardware is to try writing to reg 0x001F = 0x8000 or 0x4000. This will conduct a hard reset or soft reset. Please see if that works as well. 

Thanks,

Cecilia