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M4640-19 View Datasheet(PDF) - Conexant Systems

Part Name
Conexant Systems Conexant
M4640-19 Datasheet PDF : 47 Pages
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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 THUMBcore, 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
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.
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
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
GSM 900/1800/1900 handsets or modules
Data Sheet
Proprietary Information and Specifications are Subject to Change
Doc. No. 100779C
June 14, 2000
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