st20-gp6 STMicroelectronics, st20-gp6 Datasheet - Page 5

• Manufacturer Part Number: st20-gp6
• Description: Gps Processor
• Manufacturer: STMicroelectronics

1
The ST20-GP6 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.
The twelve channel GPS correlation DSP hardware is designed to handle twelve satellites, two of
which can be initialized to support the RTCA-SC159 specification for WAAS (Wide Area
Augmentation Service) and EGNOS (European Geostationary Navigation Overlay System)
services.
The ST20-GP6 has been designed to minimize system costs and reduce the complexity of GPS
systems. It offers all hardware DSP and microprocessor functions on one chip and provides
sufficient on-chip RAM and ROM. The entire analogue section, RF and clock generation are
available on a companion chip. Thus, a complete GPS system is possible using just two chips, see
Figure 1.1.
The ST20-GP6 supports large values of frequency offset, allowing the use of a very low cost
oscillator, thus saving the cost of a Temperature Controlled Crystal Oscillator (TCXO).
The CPU and software have access to the part-processed signal to enable accelerated acquisition
time.
Introduction
Antenna
Single chip
STB5600
No TCXO
crystal
Radio
Low
cost
ST20-GP6
ASIC
DSP
mask ROM
Figure 1.1 GPS system
optional
Watchdog
CPU
timer
RAM
Parallel
Real
time
clock
UART
I/O
(optional)
Parallel I/O
Driver
ST20-GP6
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