XRT72L52 Datasheet, PDF (27/480 Pages) Exar Corporation – TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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PRELIMINARY
PIN DESCRIPTION
PIN #
40
PIN NAME
RLOL[1]
41
GND
42
RLOOP[1]
43
LLOOP[1]
44
Req[1]
45
TAOS[1]
46
RxRed[1]
47
RxAIS[1]
48
RxOOF[1]
49
RxLOS[1]
50
EncoDis[1]
51
TxLev[1]
52
GND
53
TxAISEn[1]
54
TxOH[1]/
TxHDLCDat5[1]
55
TxOHIns[1]/
TxHDLCDat4[1]
56
VDD
57
TxOHEnable[1]/
TxHDLCDat7[1]
58
TxOHFrame[1]/
TxHDLCClk[1]
XRT72L52
TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.3
TYPE
I
****
O
O
O
O
O
O
O
O
O
O
****
I
I
I
****
O
I
O
DESCRIPTION
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
See Description for Pin 155
See Description for Pin 156
See Description for Pin 157
See Description for Pin 158
See Description for Pin 159
See Description for Pin 160
See Description for Pin 2
See Description for Pin 3
See Description for Pin 4
See Description for Pin 5
Ground
See Description for Pin 138
See Description for Pin 139
See Description for Pin 140
Power Supply 3.3V + 5%
See Description for Pin 142
See Description for Pin 144
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