Rainbow Electronics DS2154 - Manual (Page 17)

DS2154
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IDR: DEVICE IDENTIFICATION REGISTER (Address= 0F Hex)
(MSB) (LSB)
T1E1 0 0 0 ID3 ID2 ID1 ID0
SYMBOL POSITION NAME AND DESCRIPTION
T1E1 IDR.7 T1 or E1 Chip Determination Bit.
0=T1 chip
1=E1 chip
ID3 IDR.3 Chip Revision Bit 3. MSB of a decimal code that represents the chip revi-
sion.
ID2 IDR.1 Chip Revision Bit 2.
ID1 IDR.2 Chip Revision Bit 1.
ID0 IDR.0 Chip Revision Bit 0. LSB of a decimal code that represents the chip revi-
sion.
RCR1: RECEIVE CONTROL REGISTER 1 (Address=10 Hex)
(MSB) (LSB)
RSMF RSM RSIO – – FRC SYNCE RESYNC
SYMBOL POSITION NAME AND DESCRIPTION
RSMF RCR1.7 RSYNC Multiframe Function. Only used if the RSYNC pin is pro-
grammed in the multiframe mode (RCR1.6=1).
0=RSYNC outputs CAS multiframe boundaries
1=RSYNC outputs CRC4 multiframe boundaries
RSM RCR1.6 RSYNC Mode Select.
0=frame mode (see the timing in Section 13)
1=multiframe mode (see the timing in Section 13)
RSIO RCR1.5 RSYNC I/O Select. (note: this bit must be set to zero when RCR2.1=0).
0=RSYNC is an output (depends on RCR1.6)
1=RSYNC is an input (only valid if elastic store enabled)
– RCR1.4 Not Assigned. Should be set to zero when written.
– RCR1.3 Not Assigned. Should be set to zero when written.
FRC RCR1.2 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
SYNCE RCR1.1 Sync Enable.
0=auto resync enabled
1=auto resync disabled
RESYNC RCR1.0 Resync. When toggled from low to high, a resync is initiated. Must be
cleared and set again for a subsequent resync.