MT1020A Zarlink Semiconductor, MT1020A Datasheet - Page 7

• Manufacturer Part Number: MT1020A
• Manufacturer: Zarlink Semiconductor

Circuit Description
General
The MT1020A is a complete Bluetooth Baseband
processor. When used with the Zarlink-supplied
firmware and an appropriate radio transceiver it forms
a complete low power Bluetooth solution.
The MT1020A features :
• ARM7TDMI Embedded Microcontroller
• Dedicated Bluetooth Baseband Peripheral block
• Full Duplex Audio CODEC
• 20KB System RAM
Low Power Architecture
The architecture is designed for ultra low power
applications. This is achieved by:
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Bluetooth Baseband Peripheral
The Bluetooth Baseband Peripheral (BBP) sub
system
operations, with minimal processor overhead. It
works as a slave peripheral device connected to the
on-board Microprocessor.
The block includes the Link Controller hardware
required to communicate with other Bluetooth
devices via a radio IC, a queue manager system with
RAM to store packets of data, a host interface and a
CODEC. Once configured, the Bluetooth Baseband
Peripheral block can automatically transport packets
between a host interface and the Bluetooth radio,
without interaction with the processor
Bluetooth Link Controller
The Bluetooth Link Controller controls the Bluetooth
radio. The Link controller has a programmable Radio
interface enabling it to work with a number of
different Bluetooth Radio Transceivers. Within the
Link Controller payload data is assembled into data
packets for transmission and extracted from received
Minimising the processor overhead, allowing
internal system clock speeds to be reduced to
as low as 5MHz
Having a dedicated Bluetooth bus for data
packet DMA transfers
A system partition that decodes Bluetooth
packets in hardware
Operating internal core with a 2V supply
Low-power CODEC for voice applications
performs
all
time
critical
Bluetooth
data.
preamble, sync words, headers and CRCs. Data
whitening is performed; encryption is optional.
Queue Manager Block
This block performs intelligent DMA transfers
between a dedicated Bluetooth data buffer RAM and
the Bluetooth link controller, the host interface and
the voice interface. It understands and translates
between different Bluetooth packet formats, and
performs payload data queue management.
MT1020A has 12KB of Data Buffer RAM.
Host Interface
The host interface manages the communication
between the MT1020A and an external host
processor. It handles the assembly and decoding of
Host Controller Interface (HCI) packets.
MT1020A supports communication with the external
host using a high speed host UART.
Audio CODEC
The full duplex CODEC includes a microphone
amplifier and earpiece driver, together with filtering
to ITU-T G712.
Embedded Microcontroller Core
The Embedded Microcontroller, in addition to
configuring and controlling the Bluetooth Baseband
Peripheral block, has the capability to run complete
applications,
Stacks.
external host processor, making the MT1020A
particularly suitable for stand-alone applications,
where an external processor is not available.
The Microcontroller consists of an ARM7TDMI CPU
and the following general purpose peripheral blocks :
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ARM7TDMI Processor
The ARM7TDMI RISC processor contains the ARM7
32-bit core and with the Thumb
decompressor supporting 16-bit instructions, debug
extensions, fast multiplier and the ICEBreaker™
extension.
Preliminary Information
Peripheral Controller
Serial I/O
Interrupt Controller
2 Counter/Timers
DMA Controller
UART
Packets
This capability eliminates the need for an
including
are
assembled/decoded
the
Bluetooth
MT1020A
®
instruction
Protocol
with
The
The
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