DS2154 Dallas Semiconducotr, DS2154 Datasheet - Page 31

• Manufacturer Part Number: DS2154
• Description: Enhanced E1 Single Chip Transceiver
• Manufacturer: Dallas Semiconducotr

REMOTE LOOPBACK
When CCR4.7 is set to a 1, the DS2154 will be forced into Remote LoopBack (RLB). In this loopback,
data input via the RPOSI and RNEGI pins will be transmitted back to the TPOSO and TNEGO pins. Data
will continue to pass through the receive side framer of the DS2154 as it would normally and the data
from the transmit side formatter will be ignored. Please see Figure 1-1 for more details.
LOCAL LOOPBACK
When CCR4.6 is set to a 1, the DS2154 will be forced into Local LoopBack (LLB). In this loopback, data
will continue to be transmitted as normal through the transmit side of the DS2154. Data being received at
RTIP and RRING will be replaced with the data being transmitted. Data in this loopback will pass
through the jitter attenuator. Please see Figure 1-1 for more details.
CCR5: COMMON CONTROL REGISTER 5 (Address=AA Hex)
(MSB)
LIRST
SYMBOL
LIRST
RCM4
RCM3
RCM2
RCM1
RCM0
-
-
-
POSITION
CCR5.7
CCR5.6
CCR5.5
CCR5.4
CCR5.3
CCR5.2
CCR5.1
CCR5.0
-
NAME AND DESCRIPTION
Line Interface Reset. Setting this bit from a 0 to a 1 will initiate
an internal reset that affects the clock recovery state machine and
jitter attenuator. Normally this bit is only toggled on power-up.
Must be cleared and set again for a subsequent reset.
Not Assigned. Should be set to 0 when written
Not Assigned. Should be set to 0 when written.
Receive Channel Monitor Bit 4. MSB of a channel decode that
determines which receive channel data will appear in the
RDS0M register. See Section 6 for details.
Receive Channel Monitor Bit 3.
Receive Channel Monitor Bit 2.
Receive Channel Monitor Bit 1.
Receive Channel Monitor Bit 0. LSB of the channel decode.
RCM4
31 of 87
RCM3
RCM2
RCM1
RCM0
(LSB)
DS2154