MC145650 Ver la hoja de datos (PDF) - Motorola => Freescale

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MC145650

Copper Gold Asymmetric Digital Subscriber Line(ADSL)Transceiver

Motorola => Freescale 

Table 1. Recommended Operating Conditions

Parameter

DC Supply Voltage

Operating Temperature

Min

Typ

Max

Unit

3.135

3.3

3.465

V

-40

–

+85

°C

0 - 8 Mbps

Backplane

Data

Clk

Data

DAV

0 - 1 Mbps

Clk

Backplane

Control

Data

DAV

Interface

Data

DAV

MC145650

ACLK

ADATA

ADAV

TXA

Port

E1CLK

E1DATA

E1DAV

E2CLK

E2DATA

E2DAV

RXA

Port

POTS From Analog

Line Card

Line

Interface

0 - 18,000 ft.

Twisted Pair

POTS

Splitter

POTS

Splitter

Host

Processor

OAM*

Control

Data

Address

Addr/Control

Data

MCM6306D

32Kx8

FSRAM

* Operations, Administration and Maintenance

Central Office Unit (ATU-C)

POTS

Line

Interface

Addr/Control

Data

MCM6306D

32Kx8

FSRAM

MC145650

TXA

Port

ACLK

ADATA

ADAV

0 - 8 Mbps

Clk

Data

CPE

n.c.

Interface

RXA

Port

E1CLK

E1DATA

E1DAV

E2CLK

E2DATA

E2DAV

0 - 1 Mbps

Clk

Data

DAV

Clk

CPE

Interface

Data

n.c.

Control

Data

Address

Host

Processor

Remote Unit (ATU-R)

Figure 3. Typical Application

TYPICAL APPLICATION

The MC145650 can be configured to act as the master or

slave as in the typical application shown in Figure 3. Along

with a minimal amount of support electronics, it forms a com-

plete central office or remote unit. Four different data streams

can be multiplexed together on chip to make up the simplex

downstream.

The host processor is used for initialization of and mainte-

nance operation in the MC145650, while the optional SRAM

provides interleaver storage.

mined margin). In this mode of operation, much like an

analog modem but at higher data rates, a user can be

assured they are achieving the highest data throughput pos-

sible.

ATM over ADSL

The MC145650 can transport an ATM data stream by chan-

neling all data through one simplex port upstream and one

simplex port downstream. Typically Port A is utilized for the

downstream simplex port because it has the highest sup-

ported data rate. The TC (transport convergence) layer func-

tionality must be implemented externally.

Adaptive Rate Modem

The MC145650 can be configured through the host proces-

sor interface during initialization as an adaptive rate modem.

An adaptive rate modem can adjust the data rate to within 32

kbps of the maximum throughput the line is capable of sup-

porting in the current noise environment (within a predeter-

4

MC145650PP2/D

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