XRT91L82 Просмотр технического описания (PDF) - Exar Corporation

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XRT91L82

2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER

Exar Corporation 

XRT91L82

PRELIMINARY

2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER

xr

REV. P1.0.5

COMMON CONTROL

NAME

LEVEL

TYPE

PIN

DESCRIPTION

REF2CLKP LVPECL Diff

I

REF2CLKN

A11 Reference Clock Input 2

B11 This differential clock input reference is used for the transmit

clock multiplier unit (CMU) and clock data recovery (CDR) to

provide the necessary high-speed clock reference for this

device. Pin REFREQSEL[1:0] determines the value used as

the reference. See Pin REFREQSEL[1:0] for more details.

Internally terminated and biased.

REFREQSEL1

LVTTL,

I

/ SCLK

LVCMOS

D12 Reference Clock Frequency Select

Hardware Mode REFREQSEL1 pin is used to select the fre-

quency of the REF1CLK and/or REF2CLK input to the CMU

and CDR.

REFREQSEL

[1:0]

00

01

10

11

CMU

CDR

REFERENCE FREQUENCY REFERENCE FREQUENCY

155.52 MHz present on 155.52 MHz present on

REF1CLK

REF1CLK

REF2CLK not used

REF2CLK not used

155.52 MHz present on 166.63 MHz present on

REF1CLK

REF2CLK

166.63 MHz present on 155.52 MHz present on

REF2CLK

REF1CLK

166.63 MHz present on 166.63 MHz present on

REF2CLK

REF2CLK

REF1CLK not used

REF1CLK not used

NOTE: Non-FEC rates require 155.52 MHz clock reference.

FEC rates require 166.63 MHz clock reference

This pin is provided with an internal pull-down.

REFREQSEL0

LVTTL,

I

LVCMOS

Host Mode This pin is functions as the microprocessor Serial

Clock Input.

E12 Reference Clock Frequency Select

REFREQSEL0 pin is used to select the frequency of the

REF1CLK and/or REF2CLK input to the CMU and CDR.

REFREQSEL

[1:0]

00

01

10

11

CMU

CDR

REFERENCE FREQUENCY REFERENCE FREQUENCY

155.52 MHz present on 155.52 MHz present on

REF1CLK

REF1CLK

REF2CLK not used

REF2CLK not used

155.52 MHz present on 166.63 MHz present on

REF1CLK

REF2CLK

166.63 MHz present on 155.52 MHz present on

REF2CLK

REF1CLK

166.63 MHz present on 166.63 MHz present on

REF2CLK

REF2CLK

REF1CLK not used

REF1CLK not used

NOTE: Non-FEC rates require 155.52 MHz clock reference.

FEC rates require 166.63 MHz clock reference

This pin is provided with an internal pull-down.

5

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