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UG155 March 24, 2008
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Chapter 11
Dynamic Switching of 1000BASE-X and
SGMII Standards
This chapter provides general guidelines for using the core to perform dynamic standards
switching between 1000BASE-X and SGMII. The core will only provide this capability if
generated with the appropriate option, as described in Chapter 3, “Generating and
Customizing the Core.”
Typical Application
Figure 11-1 illustrates a typical application for the Ethernet 1000BASE-X PCS/PMA or
SGMII core with the ability to dynamically switch between 1000BASE-X and SGMII
standards.
The FPGA is shown connected to an external, off-the-shelf PHY with the ability to perform
both BASE-X and BASE-T standards.
• The core must operate in 1000BASE-X mode to use the optical fibre
• The core must operate in SGMII mode to provide BASE-T functionality and use the
twisted copper pair.
The GMII of the Ethernet 1000BASE-X PCS/PMA or SGMII core is shown connected to an
embedded Ethernet Media Access Controller (MAC), for example the Tri-Mode Ethernet
MAC core from Xilinx.
Figure 11-1: Typical Application for Dynamic Switching
Ethernet 1000BASE-X
PCS/PMA or SGMII
LogiCORE
Virtex-II Pro Device
RocketIO
User Logic
(Ethernet
Media
Access
Controller)
Internal
GMII
RocketIO
Interface
TXP/TXN
RXP/RXN
Twisted
Copper
Pair
1000BASE-X
or
SGMII
1000BASE-X
10 BASE-T
100BASE-T
1000BASE-T
Optical
Fibre
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