PCF5083HSLASHF2 datasheet(50/136 Pages) PHILIPS

50 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

9.1.5

TERMINAL ADAPTOR INTERFACE FOR DATA SERVICES

9.1.5.1

General description

In Fig.19 the block diagram of the data service architecture

using the PCF5083 is shown. The GSM terminal is

connected to an external terminal adaptor via the IOM®-2

interface (serial port Y) of the PCF5083. Channel coding in

accordance with

“GSM recommendation 05.03” is done by

the DSP, rate adaptation and e.g. Hayes command

handling is done by the terminal adaptor.

There are two types of information that have to be

exchanged between the terminal adaptor and the GSM

terminal:

1. User data that has to be transmitted via the air

interface. This is the input and output of the channel

codec in the PCF5083

Control data which has to be exchanged between the

System Controller and the terminal adaptor.

Data transfer via the IOM®-2 is done in form of data

frames. Each data frame contains 160 16-bit samples

(20 ms) and consists of a user data block containing user

data to/from the channel codec and a control data block

containing control data to/from the System Controller. The

DSP firmware (the procedures MP_read_data_frame and

MP_write_data_frame, see Section 9.3.1) performs

multiplexing and demultiplexing of user and control data.

Control data is forwarded to the System Controller or to the

terminal adaptor, respectively without modification or

interpretation by the DSP.

A fully integrated solution for the architecture of GSM data

services is in preparation, at which rate adaptation is

realised as an additional DSP software module, Hayes

command interpretation is part of the P90CL301 software

and data communications are done via the RS-232 port of

the P90CL301.

Fig.19 Block diagram of the GSM Data Services with the PCF5083.

handbook, full pagewidth

MGE317

TERMINAL

ADAPTOR

MUX

DEMUX

CHANNEL

CODEC

PCF5083

GSM TERMINAL

P90CL301

PCF5083 DEVICE DRIVER

LAYER 1, 2, 3, MMI, . . .

control data

user data

IOM-2

user &

control data

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