XRT75L00D Datasheet, PDF(41/92 Page) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

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XRT75L00D Datasheet, PDF (41/92 Pages) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

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REV. 1.0.2

XRT75L00D

E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

7.0 SERIAL HOST INTERFACE:

A flexible serial microprocessor interface is incorporated in the XRT75L00D. The interface is generic and is

designed to support the common microprocessors/microcontrollers. The XRT75L00D operates in Host mode

when the HOST/HW pin is tied âHighâ. The serial interface includes a serial clock (SClk), serial data input

(SDI), serial data output (SDO), chip select (CS) and interrupt output (INT). The serial interface timing is shown

in Figure 11.

The active low interrupt output signal (INT pin) indicates alarm conditions like LOS, DMO and FL to the

processor.

When the XRT75L00D is configured in Host mode, the following input pins,TxLEV, TAOS, RLB, LLB, E3, STS-

1/DS3, REQEN, JATx/Rx, JA0 and JA1 are disabled and must be connected to ground.

Table 14 below illustrates the functions of the shared pins in either Host mode or in Hardware mode.

PIN NUMBER

TABLE 14: FUNCTIONS OF SHARED PINS

IN HOST MODE

SClk

SDI

SDO

INT

IN HARDWARE MODE

RxClkINV

TxClkINV

RxON

RxMON

LOSMUT

NOTE: While configured in Host mode, the TxON input pin will be active if the TxON bit in the control register is set to â1â,

and can be used to turn on and off the transmit output drivers. This permits a system designed for redundancy to

quickly switch out a defective line card and switch-in the backup line card.

TABLE 15: REGISTER MAP AND BIT NAMES

ADDRESS

PARAMETER

DATA BITS

(HEX)

NAME

0x00

APS/Redundancy Reserved Reserved Reserved

(read/write)

RxON Reserved Reserved Reserved TxON

0x01

Interrupt Enable

(read/write)

Reserved

CNT_SATIE PRBSIE FLIE RLOLIE RLOSIE DMOIE

0x02

Interrupt Status

(reset on read)

Reserved

CNT_SATIS PRBSIS FLIS RLOLIS RLOSIS DMOIS

0x03

Alarm Status Reserved PRBSLS DLOS

ALOS

RLOL RLOS DMO

(read only)

0x04

Transmit Control

(read/write)

Reserved

TxMON INSPRBS Reserved TAOS TxClkINV TxLEV

0x05

Receive Control

(read/write)

Reserved

DLOSDIS ALOSDIS RxClkINV LOSMUT RxMON REQEN

0x06

Block Control

(read/write)

Reserved

PRBSEN RLB

LLB

STS1/ SR/DR

DS3

0x07

Jitter Attenuator

(read/write)

Reserved

DFLCK PNTRST JA1 JATx/Rx JA0

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