系統(tǒng)內非易失性閃速存儲器再編程的原理、軟硬件注意事項及對80

1.0 INTRODUCTION? 1
1.1 PROM Programmer vs
System-Processor Controlled
Programming? 1
1.2 Information Download and
Upload? 1
Version Updates (Download)? 1
Data Acquisition (Upload)? 1
2.0 DEVICE FEATURES AND ISW
APPLICATION
CONSIDERATIONS? 2
2.1 Flash Memory Pinouts? 2
2.2 Command Register
Architecture? 4
Simplified Processor Interface? 4
Command Register Reset? 5
Data Protection on Power
Transitions? 5
2.3 VPP Specifications? 6
3.0 HARDWARE DESIGN FOR ISW? 6
3.1 VPP Generation? 6
3.1.1 Regulating Down from
Higher Voltage? 6
3.1.2 Pumping 5V up to 12V? 6
3.1.3 Absolute Data Protection D
VPP On/Off Control? 7
3.1.4 Writes and Reads during
VPP Transitions? 7
3.1.5 Other VPP Considerations? 7
3.1.6 VPP Circuitry and Trace
Layout? 8
3.2 Communications D Getting Data
to and from the Flash
Memory? 8
CONTENTS PAGE
4.0 SOFTWARE DESIGN FOR ISW? 8
4.1 System Integration D Boot Code
Requirements? 8
4.1.1 ISW Flag Check? 9
4.2 Communication Protocols and
Flash Memory ISW? 9
4.3 Data Accumulation Software
Techniques? 10
4.4 Reprogramming Routines? 10
4.4.1 Quick-Erase Algorithm? 10
Algorithm Timing Delays? 10
High Performance Parallel
Device Erasure? 11
4.4.2 Quick-Pulse Programming
Algorithm? 12
Algorithm Timing Delays? 12
High Performance Parallel
Device Programming? 12
4.4.3 Pulse Width Timing
Techniques? 13
Software Methods and
Examples? 13
Hardware Methods? 13
5.0 SYSTEM DESIGN EXAMPLE: AN
80C186 DESIGN? 14
6.0 SUMMARY? 15