XRT72L50 Datasheet, PDF (66/471 Pages) Exar Corporation – SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L50
SINGLE CHANNEL DS3/E3 FRAMER WITH HDLC CONTROLLER
REV. 1.2.1
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If this bit-field is set to “1”, then the PRBS Receiver has acquired PRBS lock with the data generated by the
PRBS Generator. If this bit-field is set to “0”, then the PRBS Receiver has NOT acquired PRBS Lock with the
data generated by the PRBS Generator.
This bit-field is only valid if both the RxPRBS Enable and Tx PRBS Enable bit-fields are both set to “1”.
Bit 3 - Rx PRBS Enable
This Read/Write bit-field permits the user to enable the PRBS Receiver within the channel.
Setting this bit-field to “1” enables the PRBS Receiver. Setting this bit-field to “0” disables the PRBS Receiver.
Bit 2 - Tx PRBS Enable
This Read/Write bit-field permits the user to enable the PRBS Generator within the channel.
Setting this bit-field to “1” enables the PRBS Generator. Setting this bit-field to “0” disables the PRBS
Generator.
Receive DS3 Framer Configuration Registers
NOTE: The default register values shown below are after the operating mode is set to DS3-CBit mode. These are different
from the power-up default values. For DS3-M13 mode, default values for all registers are the same as DS3-C
execpt for Register 0x13 is 0x00 and Register 0x51 is 0x6E or b11100110
2.3.2.8 Receive DS3 Configuration & Status Register
RxDS3 Configuration & Status Register (Address = 0x10)
BIT 7
RxAIS
RO
0
BIT 6
RxLOS
RO
0
BIT 5
RxIdle
RO
0
BIT 4
RxOOF
RO
0
BIT 3
Reserved
RO
X
BIT 2
Framing On
Parity
R/W
0
BIT 1
FSync
Algo
R/W
0
BIT 0
MSync
Algo
R/W
0
Bit 7 - RxAIS (Receive AIS Pattern) Indicator
This Read-Only bit-field indicates whether or not the Receive Section of the channel is currently receiving an
AIS pattern.
The channel will set this bit-field to "0" if it is not currently detecting an AIS pattern in the incoming data stream.
The channel will set this bit-field to "1" if it is currently receiving an AIS pattern in the incoming data stream.
NOTE: For a more detailed discussion on the AIS pattern for DS3 applications, refer to Section 4.3.2.5.2
Bit 6 - RxLOS (Receive LOS Condition) Indicator
This Read-Only bit-field indicates whether or not the Receive Section of the channel is currently declaring an
LOS condition of the incoming DS3 or E3 data stream.
If this bit-field is set to "0", then the Receive Section is currently not declaring an LOS condition.
If this bit-field is set to "1", then the Receive Section is currently declaring an LOS condition.
NOTE: For more information on the LOS Declaration criteria, for DS3 or E3 applications, refer to Section 4.3.2.5.1.
Bit 5 - RxIdle (Receive Idle Pattern) Indicator
This Read-Only bit-field indicates whether or not the Receive Section of the channel is currently detecting the
Idle-pattern in the incoming DS3 data stream. This bit-field is relevant for DS3 applications only.
If this bit-field is set to "0" then the Receive Section is currently not detecting the Idle-pattern in the incoming
DS3 data stream.
If this bit-field is set to "1" then the Receive Section is currently detecting the Idle pattern in the incoming DS3
data stream.
NOTE: For more information on the Idle Pattern, refer to Section 4.3.2.5.3
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