XRT83SL314 datasheet(7/83 Pages) EXAR

7 / 83 page

XRT83SL314

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

REV. 1.0.1

PIN DESCRIPTIONS BY FUNCTION

MICROPROCESSOR

NAME

TYPE

DESCRIPTION

A22

Chip Select Input

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

chip select "Low". The microprocessor interface is disabled when the chip

select signal returns "High".

ALE_TS

C19

Address Latch Enable Input (Transfer Start)

See the Microprocessor section of this datasheet for a description.

WR_R/W

A20

Write Strobe Input (Read/Write)

See the Microprocessor section of this datasheet for a description.

RD_WE

D18

Read Strobe Input (Write Enable)

See the Microprocessor section of this datasheet for a description.

RDY_TA

AA3

Ready Output (Transfer Acknowledge)

See the Microprocessor section of this datasheet for a description.

INT

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 internally pulled "High" with a 50K

Ω resistor.

µPCLK

AB2

Micro Processor Clock Input

In a synchronous microprocessor interface, µPCLK is used as the internal tim-

ing reference for programming the LIU.

ADDR10

ADDR9

ADDR8

ADDR7

ADDR6

ADDR5

ADDR4

ADDR3

ADDR2

ADDR1

ADDR0

A23

E20

C22

Y18

AA19

AB20

AC21

AB21

AA20

Y19

AC22

Address Bus Input

ADDR[10:8] is used as a chip select decoder. The LIU has 5 chip select output

pins for enabling up to 5 additional devices for accessing internal registers.

The LIU has the option to select itself (master device), up to 5 additional

devices, or all 6 devices simultaneously by setting the ADDR[10:8] pins speci-

fied below. ADDR[7:0] is a direct address bus for permitting access to the

internal registers.

ADDR[10:8]

000 = Master Device

001 = Chip Select Output 1 (Pin B21)

010 = Chip Select Output 2 (Pin D19)

011 = Chip Select Output 3 (Pin C20)

100 = Chip Select Output 4 (Pin A21)

101 = Chip Select Output 5 (Pin B20)

110 = Reserved

111 = All Chip Selects Active Including the Master Device

XRT83SL314 Datasheet(PDF) 7 Page - Exar Corporation

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