1–68 Chapter 1: Cyclone IV Transceivers Architecture
Transceiver Functional Modes
Cyclone IV Device Handbook, February 2015 Altera Corporation
Volume 2
converted within the XGMII extender sublayer 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 provides a transparent extension of the physical reach of the
XGMII and also reduces the interface pin count.
XAUI functions as a self-managed interface because code group synchronization,
channel deskew, and clock domain decoupling is handled with no upper layer
support requirements. This functionality is based on the PCS code groups that are
used during the inter-packet gap time and idle periods.
Figure 1–62. XAUI in 10 Gbps LAN Layers
LLC or other MAC client
MAC Control (Optional)
MAC
PMA
Medium
PHY
Optional XGMII
Extender
10 Gbps
XGMII
PCS
Reconcilation
XGMII Extended Sublayer
PMD
XGMII
XAUI
XGMII Extended Sublayer
Higher Layers
LAN CSMA/DC Layers
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