Ethernet 1000BASE-X PCS/PMA or SGMII v9.1
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UG155 March 24, 2008
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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)
