ds2154lnd2 Maxim Integrated Products, Inc., ds2154lnd2 Datasheet - Page 21

• Manufacturer Part Number: ds2154lnd2
• Description: Ds2154 Enhanced E1 Single Chip Transceiver
• Manufacturer: Maxim Integrated Products, Inc.

RCR1: RECEIVE CONTROL REGISTER 1 (Address = 10 Hex)
Table 4-1. Sync/Resync Criteria
MULTIFRAME
(MSB)
RSMF
FRAME OR
SYMBOL
RESYNC
SYNCE
RSMF
LEVEL
RSIO
RSM
FRC
CRC4
CAS
FAS
—
RSM
FAS present in frame N and N + 2, and
FAS not present in frame N + 1
Two valid MF alignment words found
within 8ms
Valid MF alignment word found and
previous time slot 16 contains code
other than all 0s
POSITION
RCR1.4,
RCR1.7
RCR1.6
RCR1.5
RCR1.3
RCR1.2
RCR1.1
RCR1.0
RSIO
SYNC CRITERIA
NAME AND DESCRIPTION
RSYNC Multiframe Function. Only used if the RSYNC pin is
programmed in the multiframe mode (RCR1.6 = 1).
0 = RSYNC outputs CAS multiframe boundaries
1 = RSYNC outputs CRC4 multiframe boundaries
RSYNC Mode Select.
0 = frame mode (see the timing in Section 14)
1 = multiframe mode (see the timing in Section 14)
RSYNC I/O Select. (Note: This bit must be set to 0 when
RCR2.1 = 0.)
0 = RSYNC is an output (depends on RCR1.6)
1 = RSYNC is an input (only valid if elastic store enabled)
Not Assigned. Should be set to 0 when written.
Frame Resync Criteria.
0 = resync if FAS received in error three consecutive times
1 =resync if FAS or bit 2 of non-FAS is received in error three
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.
—
21 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
FRC
SYNCE
4.2 and 4.3.2
ITU SPEC.
RESYNC
G.706
G.706
G.732
4.1.1
4.1.2
(LSB)
5.2