6033CSINTAP05/04
Features
ARM7TDMI
ARM
Thumb
Processor Core
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
0C to + 70C Operating Temperature Range
Description
The AT75C221, Atmel's latest device in the family of smart internet appliance proces-
sors (SIAP
TM
), 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:
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.
Smart Internet
Appliance
Processor
(SIAP
TM
)
AT75C221
Summary
2
AT75C221 Summary
6033CSINTAP05/04
Pinout
The AT75C221 ships in two alternative packages:
208-lead PQFP
256-ball BGA
The product features of the 256-ball BGA package are increased compared to the 208-
lead PQFP package.
The features available only with the BGA package are:
The 32-bit wide data bus (In PQFP, only a 16-bit wide data bus is supported.)
The Parallel I/O lines PA13 to PA18 and PA20 to PA31
The Parallel I/O lines PB10 to PB16
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