User guide

Related Information
• Interlaken Protocol Definition v1.2
• Interlaken Look-Aside Protocol Definition, v1.1
Metaframe Format and Framing Layer Control Word
The Enhanced PCS supports programmable metaframe lengths from 5 to 8192 words. However, for
stability and performance, Altera recommends you set the frame length to no less than 128 words. In
simulation, use a smaller metaframe length to reduce simulation times. The payload of a metaframe could
be pure data payload and a Burst/Idle control word from the MAC layer.
Figure 2-11: Framing Layer Metaframe Format
Diagnostic
Synchronization
Scrambler State
Skip
Control and
Data Words
Diagnostic
Synchronization
Scrambler State
Skip
Metaframe Length
The framing control words include:
• Synchronization (SYNC)—for frame delineation and lane alignment (deskew)
• Scrambler State (SCRM)—to synchronize the scrambler
• Skip (SKIP)—for clock compensation in a repeater
• Diagnostic (DIAG)—provides per-lane error check and optional status message
To form a metaframe, the Enhanced PCS frame generator inserts the framing control words and encapsu‐
lates the control and data words read from the TX FIFO as the metaframe payload.
Figure 2-12: Interlaken Synchronization and Scrambler State Words Format
bx10 b011110 h0F678FF678F678F6
bx10 b001010 Scrambler State
66 63 58 57 0
Figure 2-13: Interlaken Skip Word Format
bx10 b000111
66 63 58
h21E
57
h1E
48
h1E
47
h1E
40
h1E h1E h1E
0
2-78
Metaframe Format and Framing Layer Control Word
UG-01143
2015.05.11
Altera Corporation
Implementing Protocols in Arria 10 Transceivers
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