User guide

6–4 Altera Corporation
Stratix GX Transceiver User Guide January 2005
GigE Mode Receiver Architecture
GigE Mode
Receiver
Architecture
Figure 6–3 shows the digital components of the Stratix GX receiver that
are active in GigE mode.
Figure 6–3. Block Diagram of the Stratix GX Receiver Digital Components in GigE Mode
The GigE mode receiver architecture includes:
■ Word aligner
■ Rate matcher
■ 8B/10B decoder
■ Receiver phase compensation FIFO buffer
Word Aligner
The word aligner is composed of a pattern detector and synchronization
state machines. The word aligner cannot be bypassed, but if the
application is not using the rx_enacdet signal, the word aligner does
not alter the data. Figure 6–4 shows the various components of the word
aligner. The “Pattern Detector Module” and “Synchronization State
Machines” sections describe the functionality of the main components.
Deserializer
Word
Aligner
8B/10B
Decoder
Channel
Aligner
Byte
Deserializer
Phase
Compensation
FIFO Buffer
Reference
Clock
Rate
Matcher
Digital SectionAnalog Section
Receiver
PLL
Clock
Recovery
Unit
Receiver