XRT83SL28IV datasheet(7/47 Pages) EXAR

7 / 47 page

XRT83SL28

REV. 1.0.0

8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT

PIN DESCRIPTIONS

HOST MODE INTERFACE

SERIAL MICROPROCESSOR INTERFACE

NAME

TYPE

DESCRIPTION

Chip Select Input

Active low signal. This signal enables the serial microprocessor interface by

pulling chip select "Low". The serial interface is disabled when the chip select

signal returns "High".

SCLK

Serial Clock Input

The serial clock input samples SDI on the rising edge and updates SDO on the

falling edge. See the Serial Microprocessor section of this datasheet for more

details.

SDI

Serial Data Input

The serial data input pin is used to supply an address and data string to pro-

gram the internal registers within the device. See the Serial Microprocessor

section of this datasheet for more details.

SDO

Serial Data Output

The serial data output pin is used to retrieve the internal contents of a selected

for more details.

Reset

Hardware Reset Input

Active low signal. When this pin is pulled "Low" for more than 10µS, all internal

registers and state machines are set to their default state.

NOTE: This pin must be pulled "High" to VDD for normal operation.

INT

100

Interrupt Output

Active low signal. This signal is asserted "Low" when a change in alarm status

occurs. Once the status registers have been read, the interrupt pin will return

"High". GIE (Global Interrupt Enable) must be set "High" in the appropriate

global register to enable interrupt generation.

NOTE: This pin is an open-drain output that requires an external 10K

Ω pull-up

resistor.

HW/Host

Hardware / Host Mode Select Input

This pin is used to select the mode of operation. By default, the LIU is config-

ured for Host mode. To select Hardware mode, this pin must be pulled "High".

NOTE: Internally pulled "Low" with a 50k

Ω resistor.

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