Section Ill. PRINCIPLES OF OPERATION

TM11-7021-202-12

Section Ill. PRINCIPLES OF OPERATION

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INTRODUCTION

This section provides a brief explanation of processor operating principles.

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FUNCTIONAL OVERVIEW

The processor controls, processes, and interfaces data received from external devices. The

processor can be divided into a power section, memory section, Floating Point Unit (FPU)

section, Central Processing Unit (CPU) section, and an input/output (1/0) section. The

paragraphs to follow provide information concerning the functioning of the sections

mentioned. Additionally, the processing subsystems and bus functioning are discussed.

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OPERATING PRINCIPLES

a. Power Section. The power section supplies the necessary dc power to run the

processor. It operates from either 115V ac (47 to 440 Hz) using a 3883 AC EMI Filter and

5617 AC Power Supply, or 20 to 36V dc using a 3884 DC EMI Filter and 5687 DC Power

Supply. Fuses F1, F2, and F3 provide overload protection when the processor is configured

for ac power operation. Fuses F4 and F5 provide protection in the dc power configuration.

b. Memory. Memory is either semiconductor or core based, as specified in the

processor configuration. The semiconductor memory size is 256k words and the core

memory size 64k words.

NOTE: FOR DC OPERATION, AC EMI FILTER (3SS3) AND POWER

SUPPLY (5617) IN PROCESSOR ARE REPLACED BY DC EMI

FILTER (3884} AND DC POWER SUPPLY (5667).

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