PM6341 E1XC
DATA SHEET
PMC-910419
ISSUE 8
E1 FRAMER/TRANSCEIVER
Figure 7
- Basic Framing Algorithm Flowchart
Out of Frame
Synchronization
not
found
search for
7-bit FAS
pattern
found
Algorithm #1:
Bit 2=0
Check if bit 2=1
in current byte loc.
of next frame
Algorithm #2:
Bit 2 =0
Bit 2=1
2nd FAS not
found
check
occurrence of
7-bit FAS in next
frame
Wait for byte
location in next
frame
FAS Found &
Check Sequence
selected
Algorithm #1:
Algorithm #2:
Bit 2 =0
Bit 2=0
Check bit 2 =1
Frame alignment
in following
established
frame
FAS Found & No
Check Sequence
selected
Bit 2=1
FAS not
found
check
occurrence of
7-bit FAS in next
frame
FAS Found
Frame alignment
established
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
46
PMC [ PMC-SIERRA, INC ]
