Introduction

The ST20-GP1 is an application-specific single chip micro using the ST20 CPU with microprocessor style peripherals added on-chip. It incorporates DSP hardware for processing the signals from GPS (Global Positioning System) satellites.

FEATURES

■ Application specific features

? 12 channel GPS correlation DSP hardware and ST20 CPU (for control and position caluculations) on one chip

? no TCXO required

? RTCA-SC159 / WAAS / EGNOS supported

■ GPS performance

? accuracy

- stand alone with SA on <100m, SA off <30m

- differential <1m

- surveying <1cm

? time to first fix

- autonomous start 90s

- cold start 45s

- warm start 7s

- obscuration 1s

■ 32-bit ST20 CPU

? 16/33 MHz processor clock

? 25 MIPS at 33 MHz

? fast integer/bit operations

■ 4 Kbytes on-chip SRAM

? 130 Mbytes/s maximum bandwidth

■ Programmable memory interface

? 4 separately configurable regions

? 8/16-bits wide

? support for mixed memory

? 2 cycle external access

■ Serial communications

? Programmable UART (ASC)

? OS-Link

■ Vectored interrupt subsystem

? 2 dedicated interrupt pins

? 5 levels of interrupt

■ Power management

? low power operation

? power down modes

■ Professional toolset support

? ANSI C compiler and libraries

? INQUEST advanced debugging tools

■ Technology

? Static clocked 50 MHz design

? 3.3 V, sub micron technology

■ 100 pin PQFP package

APPLICATIONS

■ Global Positioning System (GPS) receivers

■ Car navigation systems

■ Fleet management systems

■ Time reference for telecom systems