Excalibur 191 User Manual download pdf

Altera Corporation 1

Excalibur Solutions—

Using the Interrupt

Controller

December 2002, ver. 1.3 Application Note 191

AN-191-1.3

Introduction

This document describes the operation of the interrupt controller for the

Excalibur

™

devices, particularly the different interrupt modes available

when using the interrupt controller.

The interrupt controller interprets the six interrupt signals from the PLD

to the processor subsystem and works in any of the following three

interrupt modes:

■ Six individual interrupts

■ Six-bit priority scheme

■ Five-bit priority scheme plus one individual interrupt

1 This document assumes that you are familiar with the

architecture of Excalibur devices, which is detailed in the

Excalibur Devices Hardware Reference Manual.

Operating

Modes

The interrupt controller provides a simple and flexible software interface

to the interrupt system. It generates two interrupt signals to the processor,

INT_FIQ_n and INT_IRQ_n, formed from the following 17 interrupt

sources:

■ 10 interrupts from modules inside the stripe

■ 1 external pin

■ 6 from the PLD-stripe interface

In addition, five of the stripe module interrupts are available as inputs to

the PLD. Therefore, you can implement another interrupt controller in the

PLD using the five interrupt signals and the six INT_PLD[5:0] signals.

Figure 1 on page 2 shows the signals processed by the interrupt controller.

1 2 3 4 5 6 7 8 9 10

Summary of Contents

Page 1 - Controller

Altera Corporation 1Excalibur Solutions—Using the InterruptControllerDecember 2002, ver. 1.3 Application Note 191AN-191-1.3IntroductionThis document

Page 2 - 2 Altera Corporation

AN 191: Excalibur Solutions—Using the Embedded Stripe Interrupt Controller10 Altera Corporation101 Innovation DriveSan Jose, CA 95134(408) 544-7000htt

Page 3 - Interrupts

2 Altera CorporationAN 191: Excalibur Solutions—Using the Embedded Stripe Interrupt ControllerFigure 1. Signals Processed by the Interrupt ControllerT

Page 4 - Value Mode

Altera Corporation 3AN 191: Excalibur Solutions—Using the Embedded Stripe Interrupt ControllerSix Individual Interrupts ModeThe six individual interr

Page 5 - X—Don’t care

4 Altera CorporationAN 191: Excalibur Solutions—Using the Embedded Stripe Interrupt ControllerEach of the INT_PLD[5..0] interrupts has its own priorit

Page 6 - Interrupt Mode

Altera Corporation 5AN 191: Excalibur Solutions—Using the Embedded Stripe Interrupt ControllerLegend:0—False1—TrueX—Don’t careThe encoded INT_PLD[5:0

Page 7

6 Altera CorporationAN 191: Excalibur Solutions—Using the Embedded Stripe Interrupt ControllerFigure 3. Six-Bit Priority InterruptsFive-Bit Priority V

Page 8 - Revision

Altera Corporation 7AN 191: Excalibur Solutions—Using the Embedded Stripe Interrupt ControllerIn the example design, a simple interrupt controller is

Page 9 - Appendix A—Code Example

8 Altera CorporationAN 191: Excalibur Solutions—Using the Embedded Stripe Interrupt ControllerFigure 4. Five-Bit Priority Value Plus Individual Interr

Page 10 - Running the

Altera Corporation 9Appendix A—Code ExampleThe example design included with this application note contains the Quartus® II project files and all sour

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Excalibur 191 User Manual

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