Altera Stratix GX Transceiver Manual de usuario Pagina 114

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5–2 Altera Corporation
Stratix GX Transceiver User Guide January 2005
Introduction
Figure 5–1. XGMII & XAUI Relationship to ISO/IEC Open Systems Interconnection (OSI) Reference Model &
IEEE 802.3 CSMA/CD LAN Model
As noted earlier, the XGMII interface consists of 4 lanes of 8 bits. At the
transmit side of the XAUI interface, the data and control characters are
converted within the XGXS into an 8B/10B encoded data stream. Each
data stream is then transmitted across a single differential pair running at
3.125 Gbps. At the XAUI receiver, the incoming data is decoded and
mapped back to the 32 bit XGMII format. This process provides a
transparent extension of the physical reach of the XGMII and also reduces
the interface pin count.
Logical Link Control (LLC)
MAC Control (optional)
Media Access Control (MAC)
Application
Presentation
Session
Transport
Network
Data Link
Physical
OSI Reference
Model Layers
LAN Carrier Sense Multiple
Access/Collision Detect (CSMA/CD)
Layers
Higher Layers
Optional XGMII
Extender
Medium Dependent Interface
Medium
10 Gb/s
10 Gigabit Media Independent Interface
10 Gigabit Attachment Unit Interface
XGMII Extender Sublayer
Reconciliation
Physical Layer Device
XGMII Extender Sublayer
10 Gigabit Media Independent Interface
Physical Medium Attachment
Physical Coding Sublayer
Physical Medium Dependent
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