GE PACSystems RX7i - Chapter 4 CPU Operation

GFK-2222AD April 2018 139
Chapter 4 CPU Operation
This chapter describes the operating modes of a PACSystems CPU and describes the tasks the CPU
carries out during these modes. The following topics are discussed:
■ CPU Sweep
■ Program Scheduling Modes
■ Window Modes
■ Data Coherency in Communications Windows
■ Run/Stop Operations
■ Flash Memory Operation
■ Logic/Configuration Source and CPU Operating Mode at Power-Up
■ Clocks and Timers
■ System Security
■ PACSystems I/O System
■ Power-Up and Power-Down Sequences