ds21ft40 Maxim Integrated Products, Inc., ds21ft40 Datasheet - Page 26

• Manufacturer Part Number: ds21ft40
• Description: Ds21ft40 Four X Three 12 Channel E1 Framer
• Manufacturer: Maxim Integrated Products, Inc.

SYNC/RESYNC CRITERIA Table 5–1
RCR2: RECEIVE CONTROL REGISTER 2 (Address=11 Hex)
MULTIFRAME
(MSB)
Sa8S
SYMBOLS
SYMBOLS
FRAME OR
RESYNC
SYNCE
LEVEL
Sa8S
Sa7S
Sa6S
Sa5S
Sa4S
FRC
CRC4
CAS
FAS
Sa7S
FAS present in frame N and
N + 2, and FAS not present
in frame N + 1
Two valid MF alignment
words found within 8 ms
Valid MF alignment word
found and previous timeslot
16 contains code other than
all zeros
POSITION
POSITION
RCR2.7
RCR2.6
RCR2.5
RCR2.4
RCR2.3
RCR1.2
RCR1.1
RCR1.0
SYNC CRITERIA
Sa6S
NAME AND DESCRIPTION
Sa8 Bit Select. Not applicable for DS21FT40.
Sa7 Bit Select. Not applicable for DS21FT40.
Sa6 Bit Select. Not applicable for DS21FT40.
Sa5 Bit Select. Not applicable for DS21FT40.
Sa4 Bit Select. Not applicable for DS21FT40.
NAME AND DESCRIPTION
Frame Resync Criteria.
0 = resync if FAS received in error 3 consecutive times
1 = resync if FAS or bit 2 of non–FAS is received in error 3
consecutive times
Sync Enable.
0 = auto resync enabled
1 = auto resync disabled
Resync. When toggled from low to high, a resync is initiated.
Must be cleared and set again for a subsequent resync.
Sa5S
26 of 87
Three consecutive incorrect
FAS received
Alternate (RCR1.2=1) the
above criteria is met or
three consecutive incorrect
bit 2 of non–FAS received
915 or more CRC4 code
words out of 1000 received
in error
Two consecutive MF
alignment words received
in error
RESYNC CRITERIA
Sa4S
RBCS
RESE
4.2 and 4.3.2
ITU SPEC.
G.732 5.2
G.706
G.706
4.1.1
4.1.2
(LSB)
DS21FT40
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