XRT72L53 Datasheet, PDF (6/467 Pages) Exar Corporation – THREE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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PRELIMINARY
XRT72L53
THREE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.7
PIN DESCRIPTION CONNECTED PINS
PIN #
A16
PIN NAME
TxNib2[1]/
TxHDLCDat2[1]
A17
RxSer[1]/
RxIdle[1]
A18
TxOHInd[1]/
TxHDLCDat6[1]
A19
RxOHInd[1]
A20
RxClk[1]
B1
TDI
B2
EncoDis[0]
B3
RxLOS[1]
B4
RxAIS[1]
B5
RxRed[0]
TYPE
I
O
O
I
O
O
I
O
O
O
O
DESCRIPTION
Transmit Nibble-Parallel Data Input - Bit 2/Transmit HDLC Data
Input - Bit 2; Channel 1:
See Description for Pin C20
Receive Serial Output/Receive Flag Sequence Indicator - Channel
1:
See Description for Pin F19
Transmit Overhead Data Indicator output/Transmit HDLC Data
Input - Bit 6; Channel 1:
See Description for Pin E19
Receive Overhead Bit Indicator output - Channel 1:
See Description for Pin G18
Receive Clock Output signal for Serial and Nibble-Parallel Data
Interface - Channel 1:
See Description for Pin D20
Test Data In:
Boundary Scan Test data input.
Encoder (HDB3/B3ZS) Disable Output pin - Channel 0 (intended to
be connected to either the ENCODIS or the ENDECDIS input to the
DS3/E3 Line Interface Unit IC):
This output pin is intended to be connected to either the Encodis or
ENDECDIS input pin of the DS3/E3 Line Interface Unit IC. The user can
control the state of this output pin by writing a "0" or "1" to Bit 3 (Enco-
dis) within the Line Interface Driver Register (Address = 0x80). If the
user commands this signal to toggle "High" then it will disable the B3ZS/
HDB3 encoder circuitry within the DS3/E3 LIU IC. Conversely, if the
user commands this output signal to toggle "Low", then the B3ZS/HDB3
Encoder circuitry, within the DS3/E3 LIU IC will be enabled.
Writing a "1" to Bit 3 of the Line Interface Driver Register (Address =
0x80) will cause this output pin to toggle "High". Writing a "0" to this bit-
field will cause this output pin to toggle "Low".
The user is advised to disable the B3ZS/HDB3 encoder (within the DS3/
E3 LIU IC) if Channel 0, within the XRT72L53 Framer IC has been con-
figured to operate in the B3ZS/HDB3 line code.
NOTE: .This output pin can be used as a “General Purpose” Output pin.
Receive LOS (Loss of Signal) Indicator Output - Channel 1:
See Description for Pin C4
Receive AIS (Alarm Indication Signal) Indicator Output - Channel
1:
See Description for Pin C5
Receive Red Alarm Indicator Output - Channel 0:
The Framer toggles this output pin “high” to denote that one of the fol-
lowing events has been detected by the Receive Framer block, within
Channel 0:
LOS - Loss of Signal Condition
OOF - Out of Frame Condition
AIS - Alarm Indication Signal Detection
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