XRT72L52 Datasheet, PDF (40/480 Pages) Exar Corporation – TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L52
TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.3
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PRELIMINARY
PIN DESCRIPTION
PIN #
150
PIN NAME
DMO[0]
151
ExtLOS[0]
TYPE
I
I
DESCRIPTION
"Drive Monitor Output" Input (from the XR-T7300 DS3/E3 Line
Interface Unit IC):
This input pin is intended to be tied to the DMO output pin of the
XRT7300 DS3/E3 Line Interface Unit IC. The user can determine the
state of this input pin by reading Bit 2 (DMO) within the Line Interface
Scan Register (Address = 0x81). If this input signal is "high", then it
means that the drive monitor circuitry (within the XRT7300 DS3/E3 Line
Interface Unit IC) has not detected any bipolar signals at the MTIP and
MRING inputs within the last 128 (32 bit-periods. If this input signal is
"low", then it means that bipolar signals are being detected at the MTIP
and MRING input pins of the XRT7300 device.
If this customer is not using the XR-T7300 DS3/E3 Line Interface Unit
IC, then he/she can use this input pin for a variety of other purposes.
Receive LOS (Loss of Signal) Indicator Input (from XRT7300 LIU
IC):
This input pin is intended to be connected to the RLOS (Receive Loss
of Signal) output pin of the XRT7300 Line Interface Unit IC. The user
can monitor the state of this pin by reading the state of Bit 0 (RLOS)
within the Line Interface Scan Register (Address = 0x81).
If this input pin is "low", then it means that the XRT7300 device is cur-
rently NOT declaring an "LOS (Loss of Signal) condition. However, if
this input pin is "high", then it means that the XRT7300 device is cur-
rently declaring an LOS (Loss of Signal) condition.
For more information on the operation of the XR-T7300 DS3/E3 Line
Receiver IC, please consult the "XRT7300 DS3/STS-1/E3 Line Interface
Unit IC" data sheet.
Asserting the RLOS input pin will cause the XRT72L52 DS3/E3 Framer
device to declare an "LOS (Loss of Signal) condition. Therefore, this
input pin should not be used as a general purpose input.
152
RLOL[0]
153
GND
154
NC
I
Receive Loss of Lock Indicator - from the XRT7300 DS3/E3 Line
Interface Unit IC:
This input pin is intended to be connected to the RLOL (Receive Loss of
Lock) output pin of the XRT7300 Line Interface Unit IC. The user can
monitor the state of this pin by reading the state of Bit 1 (RLOL) within
the Line Interface Scan Register (Address = 0x81).
If this input pin is "low", then it means that the "clock recovery phase-
locked-loop" circuitry, within the XRT7300 device is properly locked onto
the incoming DS3 E3 data-stream; and is properly recovering clock and
data from this DS3/E3 data-stream. However, if this input pin is "high",
then it means that the phase-locked-loop circuitry, within the XRT7300
device has lost lock with the incoming DS3 or E3 data-stream, and is
not properly recovering clock and data.
For more information on the operation of the XRT7300 DS3/E3 Line
Interface Unit IC, please consult the "XRT7300 DS3/E3 Line Interface
Unit" data sheet.
If the customer is not using the XRT7300 DS3/E3 Line Interface Unit IC,
he/she can use this input pin for other purposes.
****
Ground
21