Altera Stratix GX Guide de l'utilisateur télécharger pdf (Page 12)

1–4 Altera Corporation

Stratix GX Transceiver User Guide January 2005

Transceiver Block Architecture

Transmitter & Receiver Phase Compensation FIFO Buffer

The transmitter and receiver data path has a dedicated phase

compensation FIFO buffer that decouples phase variations between the

FPGA and transceiver clock domains. These FIFO buffers ensure a

consistent, reliable interface to the logic array and simplify system design

and timing analysis.

Byte Serializer/Deserializer

The byte serializer converts a 16- or 20-bit data bus into two 8- or 10-bit

data buses, respectively, at double the data rate. The byte serializer

converts an 8- or 10-bit data bus into 16- or 20-bit data buses, allowing

maximum throughput of the transceiver without burdening the FPGA

logic array.

The byte deserializer converts an 8- or 10-bit data bus into 16- or 20-bit

data buses, allowing maximum throughput of the transceiver without

burdening the FPGA logic array.

8B/10B Encoder/Decoder

8B/10B encoding/decoding is the backbone of many transceiver

protocols, and it is often used in proprietary implementations. The

gigabit transceiver block has dedicated circuitry to perform 8B/10B

encoding in the transmitter and decoding in the receiver. This coding

technique ensures sufficient data transitions and a DC balanced stream in

the data signal for successful data recovery at the receiver.

Word Aligner

The word aligner module contains a fully programmable pattern detector

to identify specific patterns within the incoming data stream. The pattern

detector includes recognition support /K28.5/ comma characters for

8B/10B encoded data and A1 or A2 frame alignment patterns for

scrambled signals. Additionally, you can specify a custom alignment

pattern in lieu of the /K28.5/ comma.

The word aligner in the gigabit transceiver block also creates words from

the incoming serial data stream by realigning the data based on identified

byte boundaries. The realignment function uses a barrel shifter and

works with the pattern detector. Additionally, the word aligner has a

manual data realignment mode that lets you control the data realignment

in user mode without consistent alignment characters.

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Altera Stratix GX Guide de l'utilisateur Page 12