XRT72L52 Datasheet, PDF (36/480 Pages) Exar Corporation – TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L52
TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.3
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PRELIMINARY
PIN DESCRIPTION
PIN #
133
PIN NAME
TxSer[0]/
SndMsg[0]
134
TxNib3[0]/
TxHDLCDat3[0]
135
TxNib2[0]/
TxHDLCDat2[0]
TYPE
I
I
I
DESCRIPTION
Transmit Serial Payload Data Input Pin:
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.
If the XRT72L52 Framer IC has been configured to operate in the "Local
Time" Mode, then it will sample the data (on this pin) upon the rising
edge of "TxInClk". If the XRT72L52 Framer IC has been configured to
operate in the "Loop-Time" Mode, then it will sample the data (on this
pin) upon the rising edge of "RxOutClk".
NOTE: This input pin is active only if the Serial Mode has been selected.
Send Message:
This input is to remain high during the entire duration of the HDLC
packet (including FCS bytes) to be transmitted, when the HDLC control-
ler is turned on.
Transmit Nibble-Parallel Payload Data Input -3:
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 - 3:
This pin accepts bit 3 TxHDLC data when the HDLC controller is turned
on.
Transmit Nibble-Parallel Payload Data Input -2:
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 - 2:
This pin accepts bit 2 TxHDLC data when the HDLC controller is turned
on.
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