XRT72L13 datasheet(28/370 Pages) EXAR

28 / 370 page

XRT72L13

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

REV. P1.0.6

PRELIMINARY

NIBBLEINTF

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.

TxDS1Data_27/

TxHDLCData_7

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.

TxDS1Clk_27/

SEND_MSGI

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).

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

XRT72L13 Datasheet(PDF) 28 Page - Exar Corporation

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