SGMII with TSE PCS without MAC

Hallo there,

I have a problem with my module. I want to convert SGMII to RGMII.

My data flow looks like this:

SGMII Data from the Marvel Phy into the FPGA and back

Inside the FPGA it looks like this:

SERDES_RX/SERDES_TX with external PLL - TBI Interface PCS Core - GMII Data Output in a GMII2RGMII Module

Is it possible to do it this way? Without a MAC and only one PCS Core?

I read the Altera AN518

http://www.altera.com/literature/an/an518.pdf?gsa_pos=1&wt.oss_r=1&wt.oss=an518

and try to do it that way (Altera TSE Mega Core and LVDS RX/TX)

can somebody help me? give me a hint if i am on a complete wrong way?