Rainbow Electronics DS2152 - Manual (Page 22)

DS2152
031897 22/79
ESR CCR3.6 Elastic Store Reset. Setting this bit from a zero to a one will force the elas-
tic stores to a known depth. Should be toggled after RSYSCLK and
TSYSCLK have been applied and are stable. Must be cleared and set
again for a subsequent reset.
RLOSF CCR3.5 Function of the RLOS/LOTC Output.
0 = Receive Loss of Sync (RLOS)
1 = Loss of Transmit Clock (LOTC)
RSMS CCR3.4 RSYNC Multiframe Skip Control. Useful in framing format conversions
from D4 to ESF. This function is not available when the receive side elastic
store is enabled.
0 = RSYNC will output a pulse at every multfirame
1 = RSYNC will output a pulse at every other multiframe
note: for this bit to have any affect, the RSYNC must be set to output multi-
frame pulses (RCR2.4=1 and RCR2.3=0).
PDE CCR3.3 Pulse Density Enforcer Enable.
0 = disable transmit pulse density enforcer
1 = enable transmit pulse density enforcer
ECUS CCR3.2 Error Counter Update Select. See Section 5 for details.
0 = update error counters once a second
1 = update error counters every 42 ms (333 frames)
TLOOP CCR3.1 Transmit Loop Code Enable. See Section 12 for details.
0 = transmit data normally
1 = replace normal transmitted data with repeating code as defined in TCD
register
– CCR3.0 Not Assigned. Must be set to zero when written.
Pulse Density Enforcer
The SCT always examines both the transmit and
receive data streams for violations of the following rules
which are required by ANSI T1.403:
– no more than 15 consecutive zeros
– at least N ones in each and every time window
of 8 x (N +1) bits where N = 1 through 23
Violations for the transmit and receive data streams are
reported in the RIR2.0 and RIR2.1 bits respectively.
When the CCR3.3 is set to one, the DS2152 will force
the transmitted stream to meet this requirement no mat-
ter the content of the transmitted stream. When running
B8ZS, the CCR3.3 bit should be set to zero since B8ZS
encoded data streams cannot violate the pulse density
requirements.
CCR4: COMMON CONTROL REGISTER 4 (Address=11 Hex)
(MSB) (LSB)
RSRE RPCSI RFSA1 RFE RFF TSRE TPCSI TIRFS
SYMBOL POSITION NAME AND DESCRIPTION
RSRE CCR4.7 Receive Side Signaling Re–Insertion Enable. See Section 7.2 for
details.
0 = do not re–insert signaling bits into the data stream presented at the
RSER pin
1 = re–insert the signaling bits into data stream presented at the RSER pin