DP83869HM: Access to Mean Squared Error Registers

Hi Doug,

These registers are not readily available, but perhaps we can solve this in a different manner. You state that you are having link issues; what is the link partner and cable type and length being used?

Other things to note: Can you give out Reg 0x1, 0x4, 0x5, 0x9, 0xA, and 0x1DF? Please note the last register is an extended register and thus needs a four step register access.

Sincerely,

Gerome

We have used a 6' Cat 5 cable to connect to one of:  Netgear 10/100/1000 switch, LinkSys 10/100/1000 switch and a Xilinx ZCU board that uses a DP83867 PHY.  (Most of the testing is done with the ZCU board.) 

The device tree setting is the same as detailed in the DP83869 troubleshooting guide. 

• Register 1 = 0x7949
• Register 4 = 0x09e1
• Register 5 = 0x0000
• Register 9 = 0x0b00
• Register 0xa = 0x0000
• Register 0x1df = 0x0006
• Register 0x6e = 0x2c00

When can establish an unstable link (Goes up and down ~ 2 seconds) when I run the following on both sides of the link.  (I cannot transfer data during the brief time it is up.) 

ethtool -s eth0 autoneg off speed 100 duplex full

Thanks for your help,

Doug 

Hi Doug,

It appears the PHY is unable to read the link partner's settings. Are both sides auto-negotiation settings on?

In addition, is the intended speed of this device 100mbps?

Sincerely,

Gerome

They are both set for auto-negotiation.  

Ideally the speed will be 1000 Mb/s but we are trying to see if we can get it to run at any speed.  

FWIW: This is transformer set up we are using: 

Hi Doug,

For the time-being, I will refer you out to our new DP83869 Troubleshooting Guide. This has various different methodologies which were previously compiled that you can apply which may be able to help assist. If everything has been exhausted in this guide, we can discuss further.

Sincerely,

Gerome