ethernet EMAC cores available for Microblaze

H

Xilinx offers different IP cores for ethernet. like opb_ethernet
plb_ethernet, plb_temac, plb_gemac, ll_temac, ll_gemac, etc.

Which of those IPs can be used to have a gigabit MAC using Microblaz
processor.

Recently EDK servicepack 3 has been released and there is a plb_tema
but I could not find the posibilty to use it with microblaz
processor.

And there is a 1-Gigabit MAC available and was used in GSRD design bu
its also for PowerPC processor.

I want to have gigabit ethernet to be used with microblaze either wit
 hard/soft TEMAC or with gigabit soft core. Where can find th
performance differnces between these two.

The distinction between microblaze and powerPC use for different EMA
cores is really appreciated

regard
Rajes