Altera Nios II Custom Bedienungsanleitung PDF herunterladen (Seite 7)

Chapter 1: Nios II Custom Instruction Overview 1–3

Custom Instruction Types

January 2011 Altera Corporation Nios II Custom Instruction User Guide

Implementing Custom Instruction Software

The Nios II custom instruction software interface is simple and abstracts the details of

the custom instruction from the software developer. For each custom instruction, the

Nios II Embedded Design Suite (EDS) generates a macro in the system header file,

system.h. You can use the macro directly in your C or C++ application code, and you

do not need to program assembly code to access custom instructions. Software can

also invoke custom instructions in Nios II processor assembly language.

For more information about the custom instruction software interface, refer to

Chapter 2, Software Interface.

Custom Instruction Types

Different types of custom instructions are available to meet the requirements of your

application. The type you choose determines the hardware interface for your custom

instruction.

Table 1–1 shows the available custom instruction types, applications, and associated

hardware ports.

Table 1–1. Custom Instruction Types, Applications, and Hardware Ports (Part 1 of 2)

Type Application Hardware Ports

Combinational Single clock cycle custom logic blocks.

■

dataa[31:0]

■

datab[31:0]

■

result[31:0]

Multicycle

Multi-clock cycle custom logic blocks of fixed or

variable durations.

■

dataa[31:0]

■

datab[31:0]

■

result[31:0]

■

clk

■

clk_en (1)

■

start

■

reset

■

done

Extended

Custom logic blocks that are capable of

performing multiple operations

■

dataa[31:0]

■

datab[31:0]

■

result[31:0]

■

clk

■

clk_en (1)

■

start

■

reset

■

done

■

n[7:0]

1 2 3 4 5 6 7 8 9 10 11 12 ... 49 50

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