Features
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ARM7TDMI
™
ARM
®
Thumb
®
Processor Core
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– In-Circuit Emulator, 40 MHz operation
16-bit Fixed-point OakDSPCore
®
– Up to 60 MHz operations
– 104K bytes of Integrated Fast RAM, Codec Interface
Ethernet Bridge
– Dual Ethernet 10/100 Mbps MAC Interface
– 16-Kbyte Frame Buffer
1 K-Byte Boot ROM, Embedding a Boot Program
– Enable Application Download from DataFlash
®
External Bus Interface
– On-chip 32-bit SDRAM Controller
– 4 Chip Select Static Memory Controller
Multi-level Priority, Individually Maskable, Vectored Interrupt Controller
Three 16-bit Timer/Counters
Two UARTs with Modem Control Lines
Serial Peripheral Interface (SPI)
Two PIO Controllers, Managing up to 48 General-purpose I/O Pins
Supported by a Wide Range of Ready-to-use Application Software
– Multi-tasking Operating System, Networking
– Voice-processing Functions
Available in a 208-lead PQFP Package and 256-ball BGA Package
Power Supplies
– VDDIO 3.3V nominal
– VDDCORE and VDDOSC 1.8V nominal
0°C to + 70°C Operating Temperature Range
Smart Internet
Appliance
Processor
(SIAP
™
)
AT75C221
Preliminary
Description
The AT75C221, Atmel’s latest device in the family of smart internet appliance proces-
sors (SIAP
™
), is a high-performance processor designed for professional internet
appliance applications such as the Ethernet IP phone. The AT75C221 is built around
an ARM7TDMI microcontroller core running at 40 MHz with an OakDSPCore copro-
cessor running at 60 MHz and a dual Ethernet 10/100 Mbits/sec MAC interface.
In a typical standalone IP phone, the DSP handles the voice processing functions
(voice compression, acoustic echo cancellation, etc.) while the dual-port Ethernet
10/100 Mbits/sec MAC interface establishes the connection to the Ethernet physical
layer (PHY) that links the network and the PC. In such an application, the power of the
ARM7TDMI allows it to run a VoIP protocol stack as well as all the system control
tasks.
Atmel provides the AT75C221 with several software modules, including:
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A set of drivers for a Linux
®
kernel capable of driving the embedded peripherals.
A comprehensive set of tunable DSP algorithms for voice processing, tailored to
be run by the DSP subsystem.
6033BS–INTAP–02/04
Note: This is a summary document. For more information,
please contact your local Atmel sales office.
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