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T8302

Internet Protocol Telephone Advanced RISC Machine (ARM®) Ethernet QoS Using IEEE® 802.1q

Agere -> LSI Corporation 

Data Sheet

July 2001

T8302 Internet Protocol Telephone

Advanced RISC Machine (ARM *)

1 Introduction

Agere Systems’ Phone-On-A-Chip™ IP Solution is a highly-integrated device set that forms the basic building

blocks for an internet protocol telephone (IPT), residing on a local area network (LAN).

At this time, the IPT consists of two individual ICs, the T8302 IPT_ARM (advanced RISC machine) and the com-

panion T8301 IPT_DSP (digital signal processor). This two-device solution comprises the basis for a single-IC

integration of the system in the near future. The single-IC implementation will contain the functions of both IPT ICs.

For conceptual objectives, features for both ICs are listed in this document.

The general-purpose processor IC (IPT_ARM ) controls the system I/O (Ethernet, USB, IrDA, etc.) and provides

general telephone control features (LED control, keypad button scanning, LCD module interface, etc.).

A block diagram of the IPT_ARM can be found in Figure 2 on page 27.

At the heart of the IPT_DSP integrated circuit is Agere Systems’ DSP1627 digital signal processor core. The

DSP1627’s high-performance (80 MIPS) and single-cycle multiply accumulate instruction provide excellent support

for execution of voice compression/decompression and echo cancellation algorithms. The DSP1627 core and the

digital-to-analog (D/A), analog-to-digital converters (A/D), low-pass filters, and audio amplifier circuitry drive stan-

dard business telephone handsets and speakerphone hardware.

This document describes the general-purpose processor IC T8302 for the IP phone. Throughout this discussion

the IC will be referred to simply as IPT_ARM.

* ARM is a registered trademark of Advanced RISC Machines Limited.

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