XRT72L52 Datasheet, PDF (37/480 Pages) Exar Corporation – TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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PRELIMINARY
PIN DESCRIPTION
PIN #
136
PIN NAME
TxNib1[0]/
TxHDLCDat1[0]
137
TxNib0[0]/
TxHDLCDat0[0]
138
TxAISEn[0]
139
TxOH[0]/
TxHDLCDat5[0]
XRT72L52
TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.3
TYPE
I
I
I
I
DESCRIPTION
Transmit Nibble-Parallel Payload Data Input -1:
The Terminal Equipment is expected to input data, that is intended to be
transmitted to the remote terminal, over an E3 or DS3 transport
medium. The Framer IC will take data, applied to this pin, and insert it
into an outbound "E3 or DS3" frame. The XRT72L52 will sample the
data that is at these input pins, upon the rising edge of the "TxNibClk"
signal.
NOTE: This input pin is active only if the Nibble-Parallel Mode has been
selected.
Transmit HDLC Data Input - 1:
This pin accepts bit 1 TxHDLC data when the HDLC controller is turned
on.
Transmit Nibble-Parallel Payload Data Input -0:
The Terminal Equipment is expected to input data, that is intended to be
transmitted to the remote terminal, over an E3 or DS3 transport
medium. The Framer IC will take data, applied to this pin (along with
TxNib1, TxNib2, and TxNib3), and insert it into an outbound "E3 or
DS3" frame. The XRT72L52 will sample the data that is at these input
pins, upon the rising edge of the "TxNibClk" signal.
NOTE: This input pin is active only if the Nibble-Parallel Mode has been
selected.
Transmit HDLC Data Input - 0:
This pin accepts bit 0 TxHDLC data when the HDLC controller is turned
on.
Transmit AIS Command Input:
Setting this input pin "high" configures the Transmit Section to generate
and transmit an AIS Pattern.
Setting this input pin "low" configures the Transmit Section to generate
E3 or DS3 traffic in a normal manner.
Transmit Overhead Input Pin:
The Transmit Overhead Data Input Interface accepts the overhead data
via this input pin, and inserts into the "overhead" bit position within the
very next "outbound" DS3 or E3 frame. If the "TxOHIns" pin is pulled
"high", the Transmit Overhead Data Input Interface will sample the data
at this input pin (TxOH), on the falling edge of the "TxOHClk" output pin.
Conversely, if the "TxOHIns" pin is pulled "low", then the Transmit Over-
head Data Input Interface will NOT sample the data at this input pin
(TxOH). Consequently, this data will be ignored.
Transmit HDLC Data Input - 5:
This pin accepts bit 5 TxHDLC data when the HDLC controller is turned
on.
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