Figure 4-13: Transceiver Blocks in a GbE Configuration
Functional Mode
Data Rate (Gbps)
Number of Bonded Channels
Low Latency PCS
8B/10B Encoder/Decoder
Rate Match FIFO
Byte SERDES
Byte Ordering
FPGA Fabric-Transceiver
Interface Width
FPGA Fabric-Transceiver
Interface Frequency (MHz)
Disabled
Gbe
PMA-PCS Interface Width
10 bit
1.25
x1
Enabled
Word Aligner (Pattern Length)
Automatic Synchronization
State Machine
(7-bit Comma, 10-bit /K28.5/)
125
Disabled
8-bit
Disabled
Enabled
Disabled
3.125
x1
Enabled
Automatic Synchronization
State Machine
(7-bit Comma, 10-bit /K28.5/)
156.25
Enabled
16-bit
Disabled
Enabled
Gigabit Ethernet Transceiver Datapath
Figure 4-14: Transceiver Datapath in GbE-1.25 Gbps Configuration
FPGA Fabric
tx_coreclk[0]
rx_coreclk[0]
tx_clkout[0]
Transmitter Channel PCS
Transmitter Channel PMA
Receiver Channel PCS
Receiver Channel PMA
Low-Speed Parallel Clock
Parallel Recovered Clock
Low-Speed Parallel Clock
TX Phase
Compensation
FIFO
wrclk rdclk
8B/10B
Encoder
Serializer
Local Clock
Divider
RX Phase
Compensation
FIFO
8B/10B
Decoder
Rate
Match
FIFO
Word
Aligner
Deserializer
CDR
Altera Corporation
Transceiver Protocol Configurations in Cyclone V Devices
4-13
Gigabit Ethernet Transceiver Datapath
CV-53004
2013.10.17