Altera Corporation
2–1
October 2007
2. Stratix II GX Architecture
Transceivers
Stratix II GX devices incorporate dedicated embedded circuitry on the
right side of the device, which contains up to 20 high-speed 6.375-Gbps
serial transceiver channels. Each Stratix II GX transceiver block contains
four full-duplex channels and supporting logic to transmit and receive
high-speed serial data streams. The transceivers deliver bidirectional
point-to-point data transmissions, with up to 51 Gbps (6.375 Gbps per
channel) of full-duplex data transmission per transceiver block.
Figure 2–1 shows the function blocks that make up a transceiver channel
within the Stratix II GX device.
Figure 2–1. Stratix II GX Transceiver Block Diagram
(1)
n represents the number of bits in each word that need to be serialized by the transmitter portion of the PMA or have
been deserialized by the receiver portion of the PMA. n = 8, 10, 16, or 20.
(2)
m represents the number of bits in the word that pass between the FPGA logic and the PCS portion of the transceiver.
m = 8, 10, 16, 20, 32, or 40.
Transceivers within each block are independent and have their own set of
dividers. Therefore, each transceiver can operate at different frequencies.
Each block can select from two reference clocks to provide two clock
domains that each transceiver can select from.
Deserializer
Serializer
Word
Aligner
8B/10B
Decoder
XAUI
Lane
Deskew
Byte
Deserializer
8B/10B
Encoder
Phase
Compensation
FIFO Buffer
Reference
Clock
Reference
Clock
Byte
Serializer
Phase
Compensation
FIFO Buffer
Rate
Matcher
PCS Digital Section
FPGA Fabric
PMA Analog Section
Byte
Ordering
Receiver
PLL
Transmitter
PLL
Clock
Recovery
Unit
m
n
m
(1)
(2)
(1)
SIIGX51003-2.2