The Serial Gigabit Media Independent Interface (SGMII)

1 of 10 July 19, 2001

Document Number ENG-46158

Revision Revision 1.7

Author Yi-Chin Chu

Project Manager JR Rivers

Serial-GMII Specification

The Serial Gigabit Media Independent Interface (SGMII) is designed to satisfy the following

requirements:

• Convey network data and port speed between a 10/100/1000 PHY and a MAC with

document, we will use the term “GMII” to cover all of the specification regarding the MII

interface.

GMII – Gigabit Media Independent Interface: A digital interface that provides an 8-bit wide

datapath between a 1000 Mbit/s PHY and a MAC sublayer. It also supports the 4-bit wide MII

Revision Date Description

1.7 July 20, 20001 Clarify data sampling and also the possible loss of the first byte of pream-

ble.

1.6 Jan 4, 20001 Added specifications for Cisco Systems Intellectual Property.

1.5 Aug 4, 2000 Specified the data pattern for the beginning of the frame (preamble, SFD)

for the frames sent from the PHY to make the PCS layer work properly.

mV.

1.1 Nov 10, 1999 Incoporated Auto-Negotiation Process for update of link status

1.0 Oct. 14, 1999 Initial Release