xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 74

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

XRT94L33
Rev.1.2.0.
AC13
AG14
AE14
N27
A16
A14
D20
A15
B24
J23
EXTLOS_0
EXTLOS_1
EXTLOS_2
RxOOF_0
RxOOF_1
RxOOF_2
RXUCLK/
RxLOS_0
RxLOS_1
RxLOS_2
RXPCLK
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
O
O
I
I
CMOS
CMOS
TTL
TTL
For mapper applications, Please connect this pin to GND
Receive LOS (Loss of Signal) Indicator Input (from the
XRT94L33 DS3/E3/STS-1 LIU IC):
This input pin, is intended to be connected to each of the
RLOS (Receive Loss of Signal) output pins of the XRT94L33
DS3/E3/STS-1 LIU IC. The user can monitor the state of this
input pin by reading the state of Bit 0 (RLOS) within the Line
Interface Scan Register (Address = 0xXX, 0xXX).
If this input pin is “Low”, then it means that the corresponding
channel (within the XRT94L33) is currently NOT declaring an
LOS condition. However, if this input pin is “high”, then it
means that this particular channel is currently declaring an
LOS condition.
Note:
Receive STS-1/DS3/E3 Out of Frame Indicator
The STS-1/DS3/E3 Receive DS3 Framer will assert this output
signal whenever it has declared an “Out of Frame” (OOF)
condition with the incoming DS3 frames.
negated when the framer correctly locates the F- and M-bits
and regains synchronization with the DS3 frame.
STS-1/DS3/E3 Framer - Loss of Signal Output Indicator:
This pin is asserted when the Receive Section of the channel
encounters 180 consecutive 0’s (for DS3 applications) or 32
consecutive 0’s (for E3 applications) via the RxPOS_n and
RxNEG pins. For STS-1 applications, users can set the LOS
threshold value in the Receive LOS Threshold register.
(RxSTOH_LOS_TH, Address Location: 0xN02E – 0xN02F)
This pin will be negated once the Receive DS3/E3 Framer has
detected at least 60 “1s” out of 180 consecutive bits (for DS3
applications) or has detected at least four consecutive 32 bit
strings of data that contain at least 8 “1s” in the receive path.
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Framer/UNI IC to declare an “LOS (Loss of Signal)
condition. Therefore, this input pin should not be
used as a General Purpose Input pin.
Asserting this input pin will cause the XRT94L33
xr
This signal is