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Features

• ARM7TDMI

ARM

Thumb

Processor Core

• Two 16-bit Fixed-point OakDSPCore

Cores

• 256 x 32-bit Boot ROM

• 88K Bytes of Integrated Fast RAM for Each DSP

• Flexible External Bus Interface with Programmable Chip Selects

• Dual Codec Interface

• Multi-level Priority, Individually Maskable, Vectored Interrupt Controller

• Three 16-bit Timers/Counters

• Additional Watchdog Timer

• Two USARTs with FIFO and Modem Control Lines

• Industry -standard Serial Peripheral Interface (SPI)

• Up to 24 General-purpose I/O Pins

• On-chip SDRAM Controller for Embedded ARM7TDMI and OakDSPCore

• JTAG Debug Interface

• Software Development Tools Available for ARM7TDMI and OakDSPCore

• Supported by a Wide Range of Ready-to-use Application Software, including

Multitasking Operating System, Networking, Modems and Voice Processing Functions

• Available in 160-lead PQFP Package

• 2.5V Power Supply for the core and the PLL Pins, 3.3V Power Supply for Other I/O Pins

Description

The Atmel AT75C320 Smart Internet Appliance Processor (SIAP

™

) is a high-perfor-

mance processor specially designed for Internet appliance applications, such as

Internet telephony (Voice-over-Internet Protocol – VoIP). The AT75C320 is a derivative

version of the AT75C310. The device is built around an ARM7TDMI microcontroller

core running at 40 MIPS with two DSP co-processors running at 60 MIPS each – all

three processors delivering unmatched performance for low power consumption.

In a typical standalone VoIP phone, one DSP handles the voice processing functions

(voice compression, acoustic echo cancellation, etc.), while the other one deals with

the telephony functions (dialing, line echo cancellation, callerID detection, high-speed

modem, etc.). In such an application, the power of the ARM7TDMI allows it to run the

VoIP protocol stack as well as all the system control tasks.

Atmel provides the AT75C320 with three levels of software modules:

• a special port of the Linux

kernel as the proposed operating system;

• a comprehensive set of tunable DSP algorithms for modems and voice

processing, specially tailored to be run by the DSP subsystems;

• a broad range of application level software modules such as H.323 telephony or

POP-3/SMTP e-mail services.

Smart Internet

Appliance

Processor

(SIAP

™

)

AT75C320

Preliminary

Rev. 1769A–07/01

Summary of content (13 pages)

PAGE 1
Features ARM7TDMI® ARM® Thumb® Processor Core Two 16-bit Fixed-point OakDSPCore® Cores 256 x 32-bit Boot ROM 88K Bytes of Integrated Fast RAM for Each DSP Flexible External Bus Interface with Programmable Chip Selects Dual Codec Interface Multi-level Priority, Individually Maskable, Vectored Interrupt Controller Three 16-bit Timers/Counters Additional Watchdog Timer Two USARTs with FIFO and Modem Control Lines Industry -standard Serial Peripheral Interface (SPI) Up to 24 General-purpose I/O Pins On-chip SDR
PAGE 2
AT75C320 Pin Configuration Table 1.
PAGE 3
AT75C320 AT75C320 Pin Description Table 2.
PAGE 4
Table 2.
PAGE 5
AT75C320 Block Diagram Figure 1.
PAGE 6
Figure 2. DSP Subsystem Block Diagram Oak Program Bus Oak Data Bus 2K x 16 X-RAM Codec Interface 2K x 16 Y-RAM 24K x 16 Program RAM 16K x 16 Generalpurpose RAM OakDSPCore On-chip Emulation Module 256 x 16 Dual-port Mailbox Bus Interface Unit DSP Subsystem ASB Application Example Figure 3. Standalone Internet Telephone Keyboard Screen Line Line Interface Data Codec V.
PAGE 7
AT75C320 Functional Description ARM7TDMI Core The ARM7TDMI is a three-stage pipeline, 32-bit RISC processor. The processor architecture is Von Neumann load/store architecture which is characterized by a single data and address bus for instructions and data. The CPU has two instruction sets: the ARM and the Thumb instruction set. The ARM instruction set has 32-bit wide instructions and provides maximum performance. Thumb instructions are 16 bits wide and give maximum code density.
PAGE 8
EBI: External Bus Interface The EBI generates the signals that control access to external memory or memory-mapped peripherals. The EBI is fully programmable and can address up to 64M bytes. The interface to external devices is composed of common address and data buses and separate control lines to allow the connection of static or dynamic devices.
PAGE 9
AT75C320 USART: Universal Synchronous/ Asynchronous Receiver/ Transmitter The AT75C320 provides two identical full-duplex, universal synchronous/asynchronous receiver/transmitters that interface to the APB and are connected to the peripheral data controller.
PAGE 10
DSP Level A wide range of DSP functions are available for the OakDSPCore. Among others, Atmel supplies modules for a V.34 modem, G723.1 and G729A voice codecs, silence compression and echo cancellation. Application Level A rich software toolkit is available with support for popular communication protocols (H.323, POP-3/SMTP, etc.), connection processes, multimedia applications, full-feature telephony and audio software suites.
PAGE 11
AT75C320 Development Tools Both the ARM7TDMI and the OakDSPCore are industry-standard cores. They are supported by a comprehensive range of state-of-the-art development tools, including assemblers, C-compilers, source level debuggers and hardware emulators. Packaging The AT75C320 is supplied in a 160-lead PQFP package. This provides the best compromise between external connectivity and cost. Figure 4. PQFP Package Drawing For package data, see Table 3, Table 4 and Table 5 below.
PAGE 12
Package Data Table 3. Common Dimensions (mm) Symbol Min Nom Max c 0.11 0.23 c1 0.11 0.17 L 0.65 0.88 L1 1.03 1.95 REF R2 0.13 R1 0.13 S 0.4 0.3 Tolerances of Form and Position aaa 0.25 bbb 0.20 ccc 0.10 Table 4. Dimensions Specific to 160-lead Package (mm) A A1 A2 b b1 Max Min Min Nom Max Min Max Min Nom 4.07 0.25 3.17 3.42 3.67 0.22 0.38 0.22 0.3 D D1 E E1 E ddd Max BSC BSC BSC BSC BSC BSC 0.33 31.90 28.00 31.90 28.00 0.65 0.
PAGE 13
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