L2800 Ver la hoja de datos (PDF) - Conexant Systems

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Fabricante

L2800

Integrated V.90/K56flex Modem Device Sets with USB Interface for Desktop Applications

Conexant Systems 

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System Architecture

Hardware Interface

A system block diagram is shown in Figure 1.

The major interface signals are shown in Figure 2.

USB

INTERFACE

USB

CONTROLLER

UNIT

(UCU)

[68-PIN PLCC]

(R8292/

80931AA)

MODEM DEVICE SET

MICRO

CONTROLLER

UNIT

(MCU)

[80-PIN PQFP]

(L2800)

MODEM

DATA PUMP

(MDP)

[100-PIN PQFP]

(R6764)

5&'86%

TELEPHONE

LINE/

TELEPHONE

HANDSET/

AUDIO

INTERFACE

CIRCUIT

TELEPHONE

LINE

TEL HANDSET

HEADPHONE/

SPEAKER

MICROPHONE

32K x 8

ROM

1M (128K x 8)

RAM

2M (256K x 8)

ROM/FLASH ROM

Figure 1. Block Diagram

MD234F1 BD

CRYSTAL

CIRCUIT

XTAL1

XTAL2

CRYSTAL

CIRCUIT

XTLI

XTLO

VCC

SVCC

D+

USB

D-

USB

CONTROLLER

UNIT

(UCU)

A0-A15

D0-D7

A0-A2

D0-D7

VD3.3

CLKOUT

~WKRESOUT

DPIRQ

MICRO

CONTROLLER

UNIT

(MCU)

~READ

~WRITE

A0-A17

D0-D7

~DPSEL

~ROMSEL

~RAMSEL

~RINGWAKE

~RLY1 (~OH)

~RLY2 (~VOICE)

~RLY3 (~MUTE)

~RLY4 (~CALLID)

~EXTOH

LCS

RINGD

VDD

CLKIN

~WKRES

IRQ

~READ

~WRITE

A0-A4

D0-D7

~DPSEL

DGND, AGND

MODEM

DATA

PUMP

(MDP)

RS0-RS4

~CS

~RES1

~RES2

RIN

TXA1

TXA2

TELIN*

TELOUT*

SPKM

MICV*

MICM**

~RESET

VGG

AVDD

VAA

SVCC (+5V)

SVCC (+5V)

SVCC (+5V)

SVCC (+5V)

VDD

DGND

A0-A15

D0-D7

~READ

32K X 8

ROM

EXTERNAL

BUS

A0-A17

D0-D7

~READ

~WRITE

~ROMSEL

A0-A16

D0-D7

~READ

~WRITE

~RAMSEL

2M (256K X 8)

ROM/

FLASH ROM

1M (128K X 8)

RAM

* SP MODEL.

** NON-SP MODEL.

Figure 2. Hardware Interface Signals

TELEPHONE

LINE/

TELEPHONE

HANDSET/

AUDIO

INTERFACE

CIRCUIT

TELEPHONE

LINE

TELEPHONE

HANDSET

MICROPHONE

HEADPHONE/

SPEAKER

MD234F2 IF

0'



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