Xilinx 1000BASE-X - Manual (Page 211)

Ethernet 1000BASE-X PCS/PMA or SGMII v9.1 www.xilinx.com 211
UG155 March 24, 2008
R
Appendix D
1000BASE-X State Machines
This appendix is intended to serve as a reference for the basic operation of the
1000BASE-X IEEE 802.3 clause 36 transmitter and receiver state machines.
Introduction
Table D-1 illustrates the Ordered Sets defined in IEEE 802.3 clause 36. These code group
characters are inserted by the PCS Transmit Engine into the transmitted data stream,
encapsulating the Ethernet frames indicated via the GMII transmit signals.
The PCS Receive Engine performs the opposite function; it uses the Ordered Sets to detect
the Ethernet frames and from them creates the GMII receive signals.
Cross reference Table D-1 with the remainder of this Appendix. See IEEE 802.3 clause 36
for further information on these Orders Sets.
Table D-1: Defined Ordered Sets
Code Ordered_Set No. of Code-Groups Encoding
/C/ Configuration Alternating /C1/ and /C2/
/C1/ Configuration 1 4 /K28.5/D21.5/Config_Reg 1
/C2/ Configuration 2 4 /K28.5/D2.2/Config_Reg 1
/I/ IDLE Correcting /I1/,
Preserving /I2/
/I1/ IDLE_1 2 /K28.5/D5.6/
/I2/ IDLE_2 2 /K28.5/D16.2/
Encapsulation
/R/ Carrier_Extend 1 /K23.7/
/S/ Start_of_Packet 1 /K27.7/
/T/ End_of_Packet 1 /K29.7/
/V/ Error_Propagation 1 /K30.7/
1. Two data code-groups representing the Config_Reg value (contains Auto-Negotiation information)