Altera Cyclone V Device Handbook page 324

CV-53001
2013.05.06
Table 1-18: Word Aligner Operations in Manual Alignment Mode
PCS Mode
Single Width
Transceiver Architecture in Cyclone V Devices
Send Feedback
PMA PCS
Interface Width
(bits)
8 1. After the rx_digitalreset signal deasserts, a 0-to-1
transition on the rx_enapatternalign register triggers the
word aligner to look for the predefined word alignment pattern in
the received data stream and automatically synchronize to the new
word boundary.
2. Any alignment pattern found thereafter in a different word
boundary does not cause the word aligner to resynchronize to this
new word boundary because there is a lack of a preceding 0-to-1
transition on the rx_enapatternalign register.
3. To resynchronize to the new word boundary, create a 0-to-1
transition in the rx_enapatternalign register.
4. If you set the rx_enapatternalign register to 1 before the
deassertion of the rx_digitalreset signal, the word aligner
updates the word boundary when the first alignment pattern is
found, even though a 0-to-1 transition was not explicitly generated.
5. To resynchronize to the new word boundary, create a 0-to-1
transition to the rx_enapatternalign register.
6. When the word aligner synchronized to the new word boundary,
the rx_patterndetect and rx_syncstatus signals will
assert for one parallel clock cycle.
10 1. After the rx_digitalreset signal deasserts, setting the rx_
enapatternalign register to 1 triggers the word aligner to
look for the predefined word alignment pattern, or its complement
in the received data stream, and automatically synchronize to the
new word boundary.
2. Any alignment pattern found thereafter in a different word
boundary causes the word aligner to resynchronize to this new
word boundary if the rx_enapatternalign register remains
set to 1.
3. If you set the rx_enapatteralign register to 0, the word
aligner maintains the current word boundary even when it finds
the alignment pattern in a new word boundary.
4. When the word aligner synchronized to the new word boundary,
the rx_patterndetect and rx_syncstatus signals will
assert for one parallel clock cycle.
Word Aligner in Manual Alignment Mode
Word Alignment Operation
1-37
Altera Corporation