what is the meaning of CMU in Stratix IV GX ?

[eRen]

What is the meaning of CMU in Stratix IV GX ?
What is the differences between the GXB_TX and GXB_CMUTX?
What is the differences between the GXB_RX and GXB_CMURX?
How to us them?

Thanks.

[plmt2011]

I think you can find the answer in "Transceiver Architecture in Stratix IV Devices"
http://www.altera.com/literature/hb/...20architecture

From my understanding, Stratix IV devices have two CMU channels—CMU0 and CMU1—within each transceiver block that you can configure as a transceiver channel or as a clock generation block. And when you configure CMU channel as a transceiver channel you have GXB_CMUTX/RX.