XRT72L53 Datasheet, PDF (31/467 Pages) Exar Corporation – THREE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L53
THREE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.7
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PRELIMINARY
PIN DESCRIPTION CONNECTED PINS
PIN #
V7
PIN NAME
TxOH[2]/
TxHDLCDat5[2]
V16
RxNib3[2]/
RxHDLCDat3[2]
V17
RxNib1[2]/
RxHDLCDat1[2]
V20
Rd_DS
W1
LLOOP[2]
W2
TAOS[2]
W3
RxRed[2]
W4
TxLev[2]
W5
Req[2]
W6
TxOHIns[2]/
TxHDLCDat4[2]
W8
RxOHFrame[2]/
RxHDLCDat4[2]
W9
RxOHClk[2]/
RxHDLCClk[2]
W10
TxOHClk[2]
TYPE
I
O
O
I
O
O
O
O
O
I
O
O
O
DESCRIPTION
Transmit Overhead Data Input pin/Transmit HDLC Controller Data
Input - Bit 5; Channel 2:
See Description for Pin A15
Receive Nibble Output - Bit 2/Receive HDLC Controller Data Out-
put - Bit 3; Channel 2:
See Description for Pin H19
Receive Nibble Output - Bit 1/Receive HDLC Controller Data Out-
put - Bit 1; Channel 2:
See Description for Pin G20
Read Data Strobe (Intel Mode):
If the microprocessor interface is operating in the Intel Mode, then this
input will function as the RD (READ STROBE) input signal from the
local µP. Once this active-low signal is asserted, then the Framer will
place the contents of the addressed registers (within the Framer) on the
Microprocessor Data Bus (D(7:0)). When this signal is negated, the
Data Bus will be tri-stated.
Data Strobe (Motorola Mode):
If the microprocessor interface is operating in the Motorola mode, then
this pin will function as the active-low Data Strobe signal.
Local Loopback Output pin - Channel 2 (to be connected the
LLOOP input of the DS3/E3 LIU IC):
See Description for Pin C7
Transmit All Ones Signal (TAOS) Command Input - Channel 2 (to
be connected to the TAOS input of the DS3/E3 LIU IC):
See Description for Pin C6
Receive Red Alarm Indicator output - Channel 2:
See Description for Pin B5
Transmit Line Build-Out Enable/Disable Select Output - Channel 2
(to be connected to the DS3/E3 LIU IC):
See Description for Pin C3
Receive Equalization Enable/Disable Select output pin - Channel 2
(to be connected to the DS3/E3 LIU IC):
See Description for Pin A5
Transmit Overhead Data Insert Input/Transmit HDLC Data Input -
Bit 4; Channel 2:
See Description for Pin C14
Receive Overhead Frame Boundary Indicator/Receive HDLC Data
Output - Bit 4; Channel 2:
See Description for Pin A13
Receive Overhead Data Clock signal/Receive HDLC Controller Out-
put Clock - Channel 2:
See Description for Pin D12
Transmit Overhead Data Clock Output - Channel 2:
See Description for Pin A14
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