XRT72L50
SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. 1.2.1
á
7
45
TxSer/
SndMsg
I
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 XRT72L50 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 TxIn-
Clk. If the XRT72L50 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.
N
OTE
:
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 controller is turned
on.
46
TxNib0/
TxHDLCDat0
I
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 XRT72L50 will
sample the data that is at these input pins, upon the rising edge of the TxNib-
Clk signal.
N
OTE
:
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.
47
TxNib1/
TxHDLCDat1
I
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 XRT72L50 will sample the data that is at these input pins,
upon the rising edge of the TxNibClk signal.
N
OTE
:
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.
48
TxNib2/
TxHDLCDat2
I
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 XRT72L50 will sample the data that is at these input pins,
upon the rising edge of the TxNibClk signal.
N
OTE
:
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.
PIN DESCRIPTION
P
IN
#
P
IN
N
AME
T
YPE
D
ESCRIPTION