DP83867IR: TX operation not performed

Thanks for your reply.

I set some values into RGMIIDCTL(0x86) register using mmd.

But, Tx signals still do not work.

I think the main issue is that TXC(tx clock) is not output from our board(MAC).

The OS driver is provided by GHs (GreenHills Integrity RTOS).

They told me that other customers already used the provided OS driver and I have no need to add code except to add PHY ID.

Could you please let me know what to look for TXC? H/W or S/W?

Thanks for your response.
I think there is nothing wrong with the 125MHz reference clock resource because my board is normally working with other PHY IC as KSZ9031.
I will tell you about my test environment, it will help you to understand.

<<Test envrionment>>
1. H/W
   (1) My Board with KSZ9031 Phy IC 
   (2) My Board with DP83867 Phy IC

2. S/W
 (1)  Exactly the same.

3. Result
KSZ9031 Phy IC is normal working, but DP83867 Phy IC isn't. No TXC ouput signal.