S2064
QUAD SERIAL BACKPLANE DEVICE
Figure 8. Channel Lock State Machine
SOFD = LOW or
CRU Loss of Lock or
All four channels in Re-Sync with
four sequential decoding errors or
decoding error rate > 50% (block 16)
valid data within deskew window
IN SYNC
RESET
Errored codeword or
valid data outside deskew window
or SOFD = LOW
RE-SYNC
NO SYNC
Errored codeword or <4 K28.5
or SOFD = LOW
≥4 K28.5 Detected
One K28.5 Detected
ACQUIRING SYNC
Figure 9. Channel Lock Synchronization Timing
(Internal)
RESYNC A
....
....
....
....
(Internal)
RESYNC B
(Internal)
RESYNC C
(Internal)
RESYNC D
FIFO Deskewing
FIFO Deskewed
(internal)
deskewed RESYNC A
....
....
....
....
....
(internal)
deskewed RESYNC B
(internal)
deskewed RESYNC C
(internal)
deskewed RESYNC D
(internal)
CHANNEL LOCK
A,B,C,D
*Note 1
ERRA
EOFA
0
1
1
0
1
0
1
....
....
....
KFLAGA
RX data out
0
0
BC
BC
BC
BC
Valid
Data
Valid
Data
BC
BC
BC
BC
....
(K28.5) (K28.5) (K28.5) (K28.5)
1. The first three K28.5’s will be reported as “K28.5” (011), subsequent K28.5 will be reported as “Resync” or “Channel Lock Detected.” See Table 6.
12
October 13, 2000 / Revision G
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
