XRT4500CV datasheet(26/99 Pages) EXAR

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XRT4500

MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

REV. 1.0.7

PIN DESCRIPTIONS (CONT.)

Signal

DTE

MODE

DCE

MODE

TYPE

FUNCTION

TX2D

D_SCTE

D_RXC

Transmitter 2 – Digital Data Input from Terminal Equipment

The exact role that this input pin plays, depends upon whether

the XRT4500 is operating in the DTE or DCE Mode.

DTE Mode: SCTE (Transmit Clock Echo) Input

The Serial Communications Controller (at the DTE Terminal) is

expected to derive the SCTE (Transmit Clock Echo) clock signal,

from the TXC signal, and input it (into the XRT4500) via this

input pin. The XRT4500 will convert this binary data stream into

either the V.35, V.11 or V.28 format and will output this data via

the TX2A and TX2B output pins.

DCE Mode: RXC (Receive Clock) Input

The Serial Communications Controller (at the DCE Terminal) is

expected to apply the RXC clock signal to this input pin. The

XRT4500 will convert this binary data stream into either the V.35,

V.11 or V.28 format and will output this data via the TX2A and

TX2B output pins.

Note: If the XRT4500 has been configured to operate in both the

DTE and the “Echoed Clock” Mode, then the XRT4500 will

ignore this input pin and will instead use the clock signal which is

output via the “D_TXC” output pin (e.g., RX3D or pin 73).

TX3D

D_X

D_TXC

Transmitter 3 – Digital Data Input from Terminal Equipment

The exact role that this pin plays depends upon whether the

XRT4500 is operating in the DCE or DTE Modes.

DTE Mode: This input pin is not used

DCE Mode: TXC – Transmit Clock Signal

This input pin functions as the “TXC” (Transmit Clock) input signal

from the DCE Terminal. The XRT4500 will convert this “digital”

clock data into either the V.35, V.11 or V.28 format and will output

this data via the TR3A and TR3B output pins.

CM_TR3

DTE Mode: AC GND – Transmitter 3 Output Termination center

tap in V.35 Mode. Connect a 0.1µF capacitor to ground.

DCE Mode: AC GND – Receiver 3 Input Termination center tap

in V.35 Mode. Connect a 0.1µF capacitor to ground.

TR3A

TXCA

I/O

DTE Mode: Receiver 3 – Negative Data Differential Input from

Line

DCE Mode: Transmitter 3 – Negative Data Differential Output

to Line.

TR3B

TXCB

I/O

DCE Mode: Transmitter 3 – Positive Data Differential Output to Line.

DTE Mode: Receiver 3 – Positive Data Differential Input from Line.

XRT4500CV Datasheet(PDF) 26 Page - Exar Corporation

XRT4500CV Datasheet(HTML) 26 Page - Exar Corporation

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