XRT72L13 datasheet(32/370 Pages) EXAR

32 / 370 page

XRT72L13

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

REV. P1.0.6

PRELIMINARY

107

TxDS1Clk_21

Transmit DS1/E1 Clock Input - Channel 21:

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_21" input pin.

108

TxDS1Data_20/

TxHDLCData_0

Transmit DS1/E1 Data Input - Channel 20/Transmit HDLC Control-

ler Block Input - Bit 0:

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 20 (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_20 signal.

Transmit HDLC Controller Block Input - Bit 0: (High Speed HDLC

Controller Mode)

This input pin, along with TxHDLC_Data[1:7] 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 encapsulated into a HDLC frame

and transmitted to the remote terminal equipment.

109

TxDS1Clk_20

Transmit DS1 Clock Input - Channel 20:

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_20" input pin.

110

TxDS1Data_19

Transmit DS1 Data Input - Channel 19:

This input pin accepts a DS1 signal from the Terminal Equipment.

This input pin is sampled upon the "falling edge" of the TxDS1Clk_19

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 # 5 is bypassed.

111

TxDS1Clk_19

Transmit DS1 Clock Input - Channel 19:

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_19" 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 # 5 is bypassed.

112

TxDS1Data_18

Transmit DS1/E1 Data Input - Channel 18:

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_18 signal.

113

TxDS1Clk_18

Transmit DS1/E1 Clock Input - Channel 18:

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_18" input pin.

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

XRT72L13 Datasheet(PDF) 32 Page - Exar Corporation

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