XRT75R12 Datasheet, PDF (80/89 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR

XRT75R12
REV. P1.0.2
PRELIMINARY
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
BIT NUMBER
2
NAME
LOSMUT Enable
1
Receive Monitor
Mode Enable
0
Receive Equalizer
Enable
TYPE
DESCRIPTION
R/W Muting upon LOS Enable - Channel_n:
This READ/WRITE bit-field is used to configure the Receive Section
(within Channel_n) to automatically pull their corresponding Recovered
Data Output pins (e.g., RxPOS_n and RxNEG_n) to GND for the dura-
tion that the Receive Section declares the LOS defect condition. In
other words, this feature (if enabled) will cause the Receive Channel to
automatically mute the Recovered data anytime the Receive Section
declares the LOS defect condition.
0 - Disables the Muting upon LOS feature. In this setting the Receive
Section will NOT automatically mute the Recovered Data whenever it
is declaring the LOS defect condition.
1 - Enables the Muting upon LOS feature. In this setting the Receive
Section will automatically mute the Recovered Data whenever it is
declaring the LOS defect condition.
R/W Receive Monitor Mode Enable - Channel_n:
This READ/WRITE bit-field is used to configure the Receive Section of
Channel_n to operate in the Receive Monitor Mode.
If the user configures the Receive Section to operate in the Receive
Monitor Mode, then it will be able to receive a nominal DSX-3/STSX-1
signal that has been attenuator by 20dB of flat loss along with 6dB of
cable loss, in an error-free manner, and without declaring the LOS
defect condition.
0 - Configures the corresponding channel to operate in the Normal
Mode.
1 - Configure the corresponding channel to operate in the Receive
Monitor Mode.
R/W Receive Equalizer Enable - Channel_n:
This READ/WRITE register bit is used to enable or disable the Receive
Equalizer block within the Receive Section of Channel_n, as listed
below.
0 - Disables the Receive Equalizer within the corresponding channel.
1 - Enables the Receive Equalizer within the corresponding channel.
NOTE: For virtually all applications, we recommend that the user set
this bit-field to "1" (for all channels) and enable the Receive
Equalizer.
TABLE 36: XRT75R12 REGISTER MAP SHOWING CHANNEL CONTROL REGISTERS (CC_N)
TABLE 37: CHANNEL CONTROL REGISTER - CHANNEL N ADDRESS LOCATION = 0XM6
BIT 7
BIT 6
Reserved
BIT 5
PRBS Enable
Ch_n
R/W
BIT 4
RLB_n
R/W
BIT 3
LLB_n
R/W
BIT 2
E3_n
BIT 1
STS-1/DS3_n
BIT 0
SR/DR_n
R/W
R/W
R/W
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