User manual

GP4020 GPS Baseband Processor Design Manual iii
Contents
Page
Contents.........................................................................................................................................iii
Related Products and Documents.................................................................................................... v
Trademarks .................................................................................................................................... v
Document References.................................................................................................................... vi
Document Conventions .................................................................................................................. vi
1 INTRODUCTION ...............................................................................................................1
1.1 GP4020 GPS Baseband Processor Overview ........................................................................ 1
1.2 Features...............................................................................................................................1
1.3 Functional Description...........................................................................................................2
1.4 Typical Application................................................................................................................ 8
2 GP4020 PACKAGE AND ELECTRICAL CONNECTIONS ...............................................11
2.1 GP4020 100-pin Package Dimensions ................................................................................ 11
2.2 GP4020 100-pin Package Electrical Connection Details....................................................... 13
3 ARM7TDMI MICROPROCESSOR................................................................................... 19
3.1 ARM7TDMI Instruction Set Architecture............................................................................... 19
3.2 The Thumb Concept ........................................................................................................... 19
3.3 Thumb’s Advantages .......................................................................................................... 19
3.4 Operating Modes ................................................................................................................ 22
3.5 Register Sets...................................................................................................................... 23
3.6 Low Power ARM7TDMI Sleep Mode.................................................................................... 24
4 BOOT ROM.....................................................................................................................27
4.1 Functional Description......................................................................................................... 27
4.2 UART Download Data Protocol ........................................................................................... 28
5 The BµILD BUS ..............................................................................................................31
5.1 Bus Masters ....................................................................................................................... 31
5.2 Bus Slaves ......................................................................................................................... 31
5.3 Bus Signals ........................................................................................................................ 32
6BµILD SERIAL INPUT OUTPUT (BSIO) INTERFACE.....................................................33
6.1 Overview ............................................................................................................................ 33
6.2 Operational Description....................................................................................................... 34
6.3 BSIO Frequency Divider...................................................................................................... 39
6.4 BSIO Slave Select Logic ..................................................................................................... 40
6.5 BSIO Interrupt Control......................................................................................................... 41
6.6 BSIO Write Buffer and Control Register ............................................................................... 41
6.7 BSIO Read Buffer ............................................................................................................... 42
6.8 BSIO Sequencer................................................................................................................. 42
6.9 BSIO Registers................................................................................................................... 44
7 12-CHANNEL CORRELATOR (CORR) ...........................................................................49
7.1 Introduction ........................................................................................................................ 49
7.2 Tracking Modules ............................................................................................................... 52
7.3 Software Requirements....................................................................................................... 55
7.4 Controlling the 12 Channel Correlator.................................................................................. 59
7.5 12 Channel Correlator Interface Timing ............................................................................... 63
7.6 12-Channel Correlator Register Maps.................................................................................. 64
8 DMA CONTROLLER (DMAC) .........................................................................................91
8.1 Single-Addressed (Fly-by) Data transfers............................................................................. 91
8.2 Dual-Addressed (Buffered) Data Transfers .......................................................................... 97