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PSB4860

Digital Answering Machine with Full Duplex Speakerphone SAM EC

Siemens AG 

1.5

Functional Block Diagram

PSB 4860

Overview

RST OSC1 OSC2 XTAL1 XTAL2

Reset and Timing Unit

AFECLK

AFEFS

AFEDD

AFEDU

Analog

Front End

Interface

DSP

Memory Interface

Data

Interface

Control

Interface

DRST

DXST

DU/DX

DD/DR

DCL

FSC

INT

SDX

SDR

SCLK

CS

FRDY

MA0-MA15 MD0-MD7 CAS0/ CAS1/ RAS/ W/ VPRD/

ALE FCS FOE FWE FCLE

Figure 3 Block Diagram of PSB 4860

1.6

System Integration

The PSB 4860 combined with an analog front end (PSB 4851) can be used in a variety

of applications. This combination offers outstanding features like full duplex

speakerphone and emergency operation. Some applications are given in the following

sections.

1.6.1

Analog Featurephone with Digital Answering Machine

Figure 4 shows an example of an analog telephone system. The telephone can operate

during power failure by line powering. In this case only the handset and ringer circuit are

active. All other parts of the chipset are shut down leaving enough power for the external

microcontroller to perform basic tasks like keyboard monitoring.

Semiconductor Group

19

10.97

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