SGMII with Phy 88E1111 via LVDS

Hi Guys,

I have an Altera Board with 88E1111 on it connecting to FPGA via LVDS I/Os.

I have an SGMII core under verification.

I did manage to run the Auto-nego successfully once.

Then after that I have no idea what changes make the thing not work any more.

The Phy keeps sending out: BC 42 00 00, BC 5B 00 00 ... ==> my SGMII core is therefore stuck at Ability Detect

I've read the register 17 page 1 for the status, value = A010 which translates to:

- Fiber link not up

- Fiber energy not detected

Another problem is i don't have a scope to check for the signal. :(

Any advice? Any PHY register to read to find out more what's going on? Any setting to the LVDS TX at the FPGA side?

Thanks a lot!

I'm really afraid that the LVDS receiver at the PHY is blown up :(.