XRT72L13 Datasheet, PDF (31/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

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PRELIMINARY
PIN DESCRIPTIONS
PIN #
NAME
103
TxDS1Clk_23
104
TxDS1Data_22/
TxHDLCData_2
105
TxDS1Clk_22
106
TxDS1Data_21/
TxHDLCData_1
XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
TYPE
I
I
I
I
DESCRIPTION
Transmit DS1 Clock Input - Channel 23:
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_23" 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 # 6 is bypassed.
Transmit DS1/E1 Data Input - Channel 22/Transmit HDLC Control-
ler Block Input - Bit 2:
The funtion 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/E1 Data Input - Channel 22 (Multiplexer/De-Multi-
plexer Mode)
This input pin accepts either a DS1 or E1 signal from the Terminal
Equipment. This input pin is sampled upon the "falling edge" of the
TxDS1Clk_22 signal.
Transmit HDLC Controller Block Input - Bit 2: (High Speed HDLC
Controller Mode)
This input pin, along with TxHDLC_Data[0:1 and TxHDLC_Data[3:7]
function as the "Transmit HDLC Controller Byte input interface. Data
that resides on this bus, during the rising edge of "TxHDLCClk" is
latched into the "Transmit HDLC Controller Block" and will be encap-
sulated into a HDLC frame and transmitted to the remote terminal
equipment.
Transmit DS1/E1 Clock Input - Channel 22:
This input pin accepts either a DS1 (1.544MHz) or an E1 (2.048MHz)
clock signal from the Terminal Equipment. The falling edge of this sig-
nal is used to sample the data at the "TxDS1Data_22" input pin.
Transmit DS1/E1 Data Input - Channel 21/Transmit HDLC Control-
ler Block Input - Bit 1:
The funtion 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/E1 Data Input - Channel 21 (Multiplexer/De-Multi-
plexer Mode):
This input pin accepts either a DS1 or E1 signal from the Terminal
Equipment. This input pin is sampled upon the "falling edge" of the
TxDS1Clk_21 signal.
Transmit HDLC Controller Block Input - Bit 1: (High Speed HDLC
Controller Mode)
This input pin, along with TxHDLC_Data_0 and TxHDLC_Data[2:7]
function as the "Transmit HDLC Controller Byte input interface. Data
that resides on this bus, during the rising edge of "TxHDLCClk" is
latched into the "Transmit HDLC Controller Block" and will be encap-
sulated into a HDLC frame and transmitted to the remote terminal
equipment.
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