Altera Cyclone IV Device Handbook page 321

Chapter 1: Cyclone IV Transceivers Architecture
Transceiver Clocking Architecture
For Transmitter and Receiver operation in bonded channel configuration, the receiver
PCS supports configuration with rate match FIFO, and configuration without rate
match FIFO.
operation with rate match FIFO in ×2 and ×4 bonded channel configurations. For
Transmitter and Receiver operation in bonded channel configuration without rate
match FIFO, the datapath clocking is identical to
transmitter channels, and
February 2015 Altera Corporation
Figure 1–39 shows the datapath clocking in Transmitter and Receiver
Figure 1–34 on page 1–35
Figure 1–38 for the bonded
for the receiver channels.
Cyclone IV Device Handbook,
1–41
Volume 2