Chapter 1: Cyclone IV Transceivers Architecture 1–59
Transceiver Functional Modes
February 2015 Altera Corporation Cyclone IV Device Handbook,
Volume 2
1 Cyclone IV GX transceivers do not have built-in support for some PCS functions such
as auto-negotiation state machine, collision-detect, and carrier-sense. If required, you
must implement these functions in a user logic or external circuits.
The 1000 Base-X PHY is defined by IEEE 802.3 standard as an intermediate or
transition layer that interfaces various physical media with the media access control
(MAC) in a GbE system. The 1000 Base-X PHY, which has a physical interface data
rate of 1.25 Gbps consists of the PCS, PMA, and physical media dependent (PMD)
layers. Figure 1–54 shows the 1000 Base-X PHY in LAN layers.
Figure 1–54. 1000 Base-X PHY in a GbE OSI Reference Model
Notes to Figure 1–54:
(1) CSMA/CD = Carrier-Sense Multiple Access with Collision Detection
(2) GMII = gigabit medium independent interface
Logical Link Control (LLC) or other MAC client
(1)
(2)
MAC Control (Optional)
MAC
PMA
Medium
1000 Base-X PHY
GMII
PCS
Reconcilation
PMD
Higher Layers
LAN CSMA/DC Layers
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