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T8301

Internet Protocol Telephone Phone-On-A-Chip™ IP Solution DSP

Agere -> LSI Corporation 

Advance Data Sheet

December 2000

T8301 Internet Protocol Telephone

Phone-On-A-Chip™ IP Solution DSP

1 Introduction

Lucent Technologies’ Phone-On-A-Chip IP Solution

is a highly integrated set of IC chips that form the

basic building blocks for an internet protocol tele-

phone (IPT), residing on a local area network (LAN).

The IPT presently consists of two ICs—the T8301

(IPT_DSP) and the T8302 (IPT_ARM*).

The T8301 provides the audio processing engine for

voice compression and decompression, speaker-

phone echo cancellation, digital-to-analog and ana-

log-to-digital converters, low-pass filters, and

amplifiers to drive standard business telephone

handsets and speakerphone hardware.

The general-purpose processor chip T8302 controls

system I/O (Ethernet, USB, IrDA, etc.) and provides

general telephone control features (LED control, key-

pad button scanning, LCD module interface, etc.).

A block diagram of the T8301 can be found in

Figure 3 on page 8.

Since the DSP1627 is an integral part of the T8301,

we will refer to the DSP1627 Digital Signal Processor

Data Sheet throughout this discussion.

1.1 Features

s DSP1627 core with bit manipulation unit.

s DSP clock speeds up to 80 MHz.

s Instruction ROM, 32K x 16 (zero wait-state

at 80 MHz).

s Dual-port RAM, 6K x 16 (zero wait-state at

80 MHz).

s Internal SRAM, 16K x 16 (single wait-state at

80 MHz).

s 16-bit analog-to-digital converter.

s Programmable gain amplifier on audio input.

s Fixed gain differential microphone input.

s Analog input SRAM buffer, 512 x 16.

s Timed DMA for analog input SRAM.

s Two 16-bit digital-to-analog converters.

s Independent simultaneous speaker and handset

outputs.

s Two integrated differential speaker driver outputs.

s Two analog output SRAM buffers, 512 x 16 each.

s Two timed DMA outputs for simultaneous handset

and speaker audio output.

s Low-pass filtering on audio inputs and outputs.

s Serial I/O interface.

s General-purpose timer counter.

s Bit I/O interface.

s JTAG test and debugging control.

s Implementation in 0.35 µm, 5 V silicon technology.

s Packaged in 100-pin TQFP.

* ARM is a registered trademark of Advanced RISC Machines Lim-

ited.

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