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M46

Baseband Processor for GSM Applications

Conexant Systems 

M46

Baseband Processor for GSM Applications

Conexant’s M46 Baseband Processor (BP) is a highly integrated, dual core

processor optimized for use in Global System for Mobile Communications (GSM)

cellular handset applications. With its companion devices, the 20420 Integrated

Analog (IA) device (refer to Conexant document number 100773) and the 20436

Power Management Integrated Circuit (PMIC) device (refer to Conexant document

number 100772), the BP forms Conexant’s baseband device set for GSM single-

band or multi-band handsets.

The BP integrates the industry standard ARM 7 THUMB core, Conexant’s high

performance Digital Signal Processor (DSP) core, a Viterbi co-processor, and

auxiliary digital support circuitry. Both the DSP core and the ARM7 THUMB

Reduced Instruction Set Computer (RISC) architecture are well suited to meet the

needs of low power, high performance embedded systems such as cellular phones.

The BP operates over a range of 2.7 V to 3.6 V making it ideal for low power

applications.

The baseband processing tasks are divided between the two processor cores. The

DSP core executes the physical layer processing functions and the microcontroller

core executes the Layer 2 and Layer 3 protocol software and the Man-Machine

Interface (MMI) functions. The two cores communicate through a dedicated block

of dual port memory. Each of the functional blocks in the device can be individually

powered down to ensure minimum current consumption in the idle or standby

mode. A block diagram of the device is provided in Figure 1.

The BP is packaged in a 160-pin micro Ball Grid Array (µBGA) with a 16-bit data

bus and a 22-bit address bus. The package and pin configuration of the BP are

shown in Figure 2. The signal pin assignments and functional pin descriptions are

provided in Table 1.

Features

• Execution of GSM protocol stack software (Layers

1, 2, and 3)

• Execution of MMI software

• Interface to handset MMI peripherals (e.g., keypad,

LCD, buzzer, etc.)

• Interface to data terminals

• Functional interface to a Subscriber Identity

Module (SIM)

• Interface to handset memory components (Flash,

SRAM, etc.)

• Integrated Real-Time Clock (RTC)

• Supports full rate and enhanced full rate speech

coders

• Encryption/decryption

• Automatic Frequency Control (AFC)

• Automatic Gain Control (AGC)

• Digital Audio Interface (DAI)

• Interfaces to Conexant IA and PMIC devices

• Low power operation (2.7 V to 3.6 V)

• Optional voice features: voice recognition, voice

prompts, conversation record, and voice memo

• Optional 14.4 kbps data/fax support

Applications

• GSM 900/1800/1900 handsets or modules

Data Sheet

Conexant

Proprietary Information and Specifications are Subject to Change

Doc. No. 100779C

June 14, 2000

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