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XRT7302IV

2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

Exar Corporation 

XRT7302 2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

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REV. 1.1.6

PIN DESCRIPTION

PIN #

19

SIGNAL NAME

SDI/(RxOFF0)

20

SDO/(E3_Ch0)

21

STS-1/DS3_Ch0

22

ICT

23

LOSTHR0

TYPE

I

I/O

I

I

I

DESCRIPTION

Serial Data Input for the Microprocessor Serial Interface/Channel 0 -

Receiver Shut OFF Input pin:

The function of this input pin depends on whether the XRT7302 is operating in

the HOST Mode or in the Hardware Mode.

HOST Mode - Serial Data Input for the Microprocessor Serial Interface:

To read or write data into the Command Registers over the Microprocessor

Serial Interface, apply the Read/Write bit, the Address Values of the Com-

mand Registers and Data Value to be written during Write Operations to this

pin.

This input is sampled on the rising edge of the SClk pin.

Hardware Mode - Channel 0 Receiver Shut OFF Input pin:

Setting this input pin “High” shuts off the Channel 0 receiver. Setting this input

pin “Low” enables the Receive Section for full operation.

Serial Data Output from the Microprocessor Serial Interface/E3_Mode

Select - Channel 0:

The function of this pin depends on whether the XRT7302 is operating in the

HOST Mode or in the Hardware Mode.

HOST Mode Operation - Serial Data Output for the Microprocessor Serial

Interface:

This pin serially outputs the contents of the specified Command Register dur-

ing Read Operations. The data is updated on the falling edge of the SClk

input signal and tri-stated upon completion of data transfer.

Hardware Mode Operation - E3 Mode Select - Channel 0:

This input pin is used to configure Channel 0 in the XRT7302 to operate in the

E3 or STS/DS3 Modes. Setting this input pin to "High" configures Channel 0

to operate in the E3 Mode. Setting this input pin to "Low" configures Channel

0 to operate in either the DS3 or STS-1 Modes, depending upon the state of

the STS-1/DS3_Ch0 input pin.

STS-1/DS3 Select Input - Channel 0:

Set this input pint to “High” for STS-1 and “Low” for DS3 Operation.

The XRT7302 ignores this pin if the E3_Ch0 pin is set to “1". This input pin is

ignored if the XRT7302 is operating in the HOST Mode. If the XRT7302 is

operating in the HOST Mode, the pin should be tied to GND.

In-Circuit Test Input:

Setting this pin "Low" causes all digital and analog outputs to go into a high-

impedance state to allow for in-circuit testing. For normal operation, set this

pin "High".

NOTE: This pin is internally pulled “High".

Loss of Signal Threshold Control - Channel 0:

The voltage forced on this pin controls the input loss of signal threshold for

Channel 0. Forcing the LOSTHR0 pin to GND or VDD provides two settings.

This pin must be set to the desired level upon power up and should not be

changed during operation.

NOTE: This pin is only applicable during DS3 or STS-1 operations.

6

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