Xilinx 1000BASE-X - Manual (Page 199)

Ethernet 1000BASE-X PCS/PMA or SGMII v9.1 www.xilinx.com 199
UG155 March 24, 2008
Loopback R
Figure 14-2: Loopback Implementation When Using the Core with RocketIO
Transceivers
Ethernet 1000BASE-X
PCS/PMA or SGMII Core
RocketIO
Transceiver
Tx
Rx
FPGA
Loopback occurs in core
PCS Tx Engine
PCS Rx Engine
Idle Stream
loopback control