XRT72L13 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT72L13' PDF : 370 Pages View PDF
XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
áç
PRELIMINARY
PIN DESCRIPTIONS
PIN #
92
NAME
NIBBLEINTF
93
TxDS1Data_27/
TxHDLCData_7
94
TxDS1Clk_27/
SEND_MSGI
TYPE
I
I
I
DESCRIPTION
Nibble Interface Select Input Pin
This input pin allows the user to configure the Transmit Payload Data
Input Interface and the Receive Payload Data Output Interface to
operate in either the "Serial-Mode" or the "Nibble/Parallel-Mode".
Setting this input pin "high" configures the Transmit and Receive Ter-
minal Interfaces to operate in the "Nibble/Parallel-Mode". In this
mode, the “Transmit Payload Data Input Interface” block will accept
the “outbound” payload data (from the Terminal Equipment) in a “nib-
ble-parallel” manner via the “TxNib[3:0]” input pins. Further, the
“Receive Payload Data Output Interface” block will output the
“inbound” payload data (to the Terminal Equipment) in a “nibble-paral-
lel” manner via the “RxNib[3:0]” output pin.
Setting this input pin "low" configures the Transmit and Receive Termi-
nal Interfaces to operate in the "Serial" Mode. In this mode, the
“Transmit Payload Data Input Interface” block will accept the “out-
bound” payload data (from the Terminal Equipment) in a “serial” man-
ner via the “TxSer” input pin. Further, the “Receive Payload Data
Output Interface” block will output the “inbound” payload data (to the
Terminal Equipment) in a “serial” manner via the “RxSer” output pin.
Transmit DS1 Data Input - Channel 27:
This input pin accepts a DS1 signal from the Terminal Equipment.
This input pin is sampled upon the "falling edge" of the TxDS1Clk_27
signal.
NOTES:
1. This input pin is inactive if the corresponding M12 MUX is
multiplexing 3 E1's into an ITU-T G.747 data stream.
2. This input pin accepts DS2 data if M12 MUX # 7 is bypassed.
Transmit DS1 Clock Input - Channel 27/SEND_MSG Request
Input:
The function of this output pin depends upon whether the XRT72L13
is operating in the "Multiplexer/De-Multiplexer" Mode or in the "High
Speed HDLC Controller" Mode.
Transmit DS1 Clock Input - Channel 27 (Multiplexer/De-Multi-
plexer Mode):
This input pin accepts a DS1 (1.544MHz) clock signal from the Termi-
nal Equipment. The falling edge of this signal is used to sample the
data at the "TxDS1Data_27" input pin.
NOTES:
1. This input pin is inactive if the corresponding M12 MUX is
multiplexing 3 E1's into an ITU-T G.747 data stream.
2. This input pin accepts a DS2 rate clock signal (6.312MHz) if
M12 MUX # 7 is bypassed.
SEND_MSG Request Input: (High Speed HDLC Controller Mode):
Setting this input pin "HIGH" indicates that the byte, currently on the
TxHDLC_Data[7:0] bus is the last byte to be included in the HDLC
frame (not counting the CRC-16 or CRC-32 value).
16
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