AD20msp410

–6–

REV. 0

Digital Audio Interface (DAI)

As required by the GSM specifications, a digital audio interface

is provided to allow certain tests of the audio section during type

approval. This interface is provided by the serial bus between

the ASP and the PLP and two additional control signals from

the PLP. A fully functional “DAI Box” needed for the FTA

process may be obtained from Analog Devices upon request.

Digital Interface to the PLP for Data Services

A conventional H8 serial port combined with a proprietary

protocol is used to interface to an external Data Terminal

Adapter.

Digital Interface from the PLP to the EEPROM

The PLP provides separate pins to interface directly to an

external EEPROM via a serial port. This EEPROM is typically

used for storage of calibration or user variable parameters like

handset identifier (IMEI), language, keypad lock and radio

calibration parameters. A typical size of the EEPROM is 2K

× 8

bits, but this depends on the individual design of the handset.

GSM Baseband Processing Key Parts List

Table 1 lists the major hardware components necessary to

complete the GSM baseband processing subsystem. An example

Bill Of Material is available from Analog Devices. A full

reference design is available through Analog Devices/The

Technology Partnership.

Table I. List of Key Components

Quantity

Description

Specification

1

ASP

1

ADSP-2178

1

PLP

1

ADPLP01

1

BBC

1

AD7015

1

FLASH-PROM

2

256K

× 16, 150 ns

1

SRAM

128K

× 8, 120 ns

1

EEPROM

3

2K

× 8

1

Display Driver

Design Specific

NOTES

(1, 2, 3) programs as well as a typical user interface (MMI). Larger

memory can be used to support enhanced user interfaces.

KEYPAD

KEYPAD

DATA

INTERFACE

ASP

BBC

CLOCK

POWER

SUBSYSTEM

13MHz

VCTCXO

DAI

INTERFACE

PLP

SPORT 0

SPORT 1

ADDRESS

DATA BUS

SYNTHESIZER

AND RADIO

CONTROL

DEMODULATOR

MODULATOR

IF

AMPLIFIER

RADIO

POWER

AMPLIFIER

CAR KIT

VOICEBAND

ANALOG I/O

AUX DAC 1

(AGC)

AUX DAC 3

(AGC)

BASEBAND

ANALOG I/O

AUX ADC

BASEBAND

SERIAL PORT

VOICEBAND

SERIAL PORT

AUX DAC 2

(AFC)

DAI CONTROL

ASP

INTERFACE

POWER

CONTROL

SYNTHESIZER

AND RADIO

CONTROL

DATA

INTERFACE

EEPROM

INTERFACE

KEYPAD

INTERFACE

BACKLIGHT

CONTROL

DISPLAY

CONTROL

PSRAM

CONTROL

DATA

ADDRESS

SERIAL PORT

SIM

INTERFACE

Figure 5. System Interfaces