XRT72L54 Datasheet, PDF (38/484 Pages) Exar Corporation – FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L54
FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
áç
PRELIMINARY
PIN DESCRIPTION
PIN #
G20
PIN NAME
RxNib1[0]/
RxHDLCDat1[0]
H1
TxLineClk[1]
H2
RxLineClk[1]
H3
RxPOS[1]
H4
GND
H17
GND
H18
RxNib2[0]/
RxHDLCDat2[0]
H19
RxNib3[0]/
RxHDLCDat3[0]
H20
INT
J1
TxFrameRef[2]
J2
RxOutClk[1]/
RxHDLCDat7[1]
J3
TxNEG[1]
TYPE
O
O
I
I
****
****
O
O
O
I
O
O
DESCRIPTION
Receive Nibble Output - 1:
The Framer IC will output "Received data (from the Remote Terminal) to
the local Terminal Equipment via this pin along with RxNib0, RxNib2
and RxNib3.
The data at this pin is updated on the rising edge of the RxClk output
signal.
NOTE: This output pin is active only if the Nibble-Parallel Mode has
been selected.
Receive HDLC Data Output - 1:
This pin contains bit 1 RxHDLC data when the HDLC controller is on.
See Description for Pin E2
See Description for Pin F1
See Description for Pin F2
Ground
Ground
Receive Nibble Output - 2:
The Framer IC will output "Received data (from the Remote Terminal) to
the local Terminal Equipment via this pin along with RxNib0, RxNib1
and RxNib2.
The data at this pin is updated on the rising edge of the RxClk output
signal.
NOTE: This output pin is active only if the Nibble-Parallel Mode has
been selected.
Receive HDLC Data Output - 2:
This pin contains bit 2 RxHDLC data when the HDLC controller is on.
Receive Nibble Output - 3:
The Framer IC will output "Received data (from the Remote Terminal) to
the local Terminal Equipment via this pin along with RxNib0, RxNib1
and RxNib2.
The data at this pin is updated on the rising edge of the RxClk output
signal.
NOTE: This output pin is active only if the Nibble-Parallel Mode has
been selected.
Receive HDLC Data Output - 3:
This pin contains bit 3 RxHDLC data when the HDLC controller is on.
Interrupt Request Output:
This open-drain, active-low output signal will be asserted when the
Framer device is requesting interrupt service from the local micropro-
cessor. This output pin should typically be connected to the "Interrupt
Request" input of the local microprocessor.
See Description for Pin E1
See Description for Pin E3
See Description for Pin D1
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