Altera Transceiver PHY IP Core - Manual (Page 222)

Name Value Description
Enable run length violation
checking
On/Off If you turn this option on, you can specify the
run length which is the maximum legal
number of contiguous 0s or 1s.
Run length 40-640 Specifies the threshold for a run-length
violation.
Table 9-6: More Information About Word Aligner Functions
PMA-PCS Interface Width (bits) Word Alignment
Mode
Word Alignment
Pattern Length (bits)
Word Alignment Behavior
8 Manual alignment 8, 16 User-controlled signal starts
alignment process.
Alignment occurs once
unless signal is re-asserted.
10
Manual alignment
7 , 10
User-controlled signal starts
alignment process.
Alignment occurs once
unless signal is re-asserted.
Automatic
synchronized state
machine
Data must be 8B/10B
encoded and aligns to
selected word aligner
pattern.
16 Manual alignment 8 , 16, 32 User-controlled signal starts
alignment process.
Alignment occurs once
unless signal is re-asserted.
20
Manual alignment 7, 10, 20 User-controlled signal starts
alignment process.
Alignment occurs once
unless signal is re-asserted.
Automatic
Synchronized State
Machine
7, 10, 20 Automatically selected word
aligner pattern length and
pattern.
Related Information
• Transceiver Architecture in Stratix V Devices
• Transceiver Architecture in Arria V Devices
• Transceiver Architecture in Cyclone V Devices
Rate Match FIFO Parameters
The rate match FIFO compensates for small clock frequency differences between the upstream transmitter
and the local receiver clocks by inserting or removing skip (SKP) symbols or ordered-sets from the inter-
packet gap (IPG) or idle streams. It deletes SKP symbols or ordered-sets when the upstream transmitter
UG-01080
2015.01.19
Rate Match FIFO Parameters 9-9
Custom PHY IP Core Altera Corporation
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