Spartan 3E FPGA开发板实验三：探索PicoBlaze嵌入式处理器

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在Spartan 3E Starter Kit FPGA开发板的实验三中，学生将深入探索Xilinx的PicoBlaze嵌入式处理器。PicoBlaze是Xilinx的一项知识产权，作为一种知识产权核心（IP Core），它是免费提供给Xilinx客户使用的。IP Core的概念是为各种系统设计中的特定功能提供可重用的硬件模块，使得设计者能够在一个项目中复用它们，从而节省时间和资源。实验的主要目标是让学生熟悉PicoBlaze，并实际操作一个嵌入式处理器系统，该系统包括多个外围设备。在这个实验中，硬件设计已经预置，学生需要进行的是软件配置和创建约束文件，即指定硬件与软件交互的规则。虽然硬件部分已经准备好，但理解硬件设计仍然是关键，因为后续的实验室任务可能会再次涉及到PicoBlaze。系统的一个关键组成部分如图1所示，这是一个简洁的系统框图，其中未显示常见的时钟和复位信号。图中展示了处理器与其他外设如何协同工作，例如可能包含内存接口、串行通信端口或定时器等。通过这个实验，学生将学习如何配置PicoBlaze的指令集、数据路径以及与周边硬件的连接，从而构建一个完整、可运行的嵌入式系统。实验过程中，学生需要阅读并理解硬件描述文档，以便能够独立分析和解决问题。此外，实践经验将有助于培养他们对硬件-software交互的理解，这对于未来的FPGA设计工作至关重要。因此，参与此实验不仅锻炼了编程和硬件设计技能，还加强了对IP Core在现代集成电路设计中的作用的认识。实验三旨在通过实践操作，使学生掌握使用PicoBlaze在Spartan 3E FPGA开发板上构建嵌入式系统的基本步骤，同时提升他们处理复杂硬件和软件集成问题的能力。通过完成这一实验，他们将为进一步的专业发展打下坚实的基础。

San Jose State University

Department of Electrical Engineering

EE178, Fall 2007, Crabill

Laboratory Assignment #3

Objectives

The objective of this lab is to gain familiarity with the PicoBlaze embedded processor from Xilinx.

PicoBlaze is a piece of intellectual property owned by Xilinx. Xilinx makes PicoBlaze available to its

customers for free, as what is called an IP core – or “core” for short. The idea is that PicoBlaze implements

a function applicable in many systems, and Xilinx customers may be able to re-use it in their own designs.

Xilinx provides a large variety of IP cores, many of which are free.

In this lab, you will implement an embedded processor system with several peripherals. From a hardware

perspective, the system is provided and you only need to assemble the project and create a constraint file.

You are encouraged to read the hardware description of the system, however, so that you understand it.

This is particularly important because you will encounter PicoBlaze in future lab assignments. Figure 1

shows a block diagram of the system. The omnipresent clock and reset signals have been omitted.

Figure 1: System Block Diagram

The main task for this lab is to write software in PicoBlaze assembly to implement two tasks. The first task

is to modify the provided code to display your name on the LCD instead of the instructor’s name. The

second task is to write code to read the switch settings and mirror them on the LEDs.

When you successfully complete this lab, you will have gained an understanding of how to use PicoBlaze

to implement a small embedded processor system.

Bibliography

This lab uses the Verilog-HDL version of PicoBlaze; you can read about PicoBlaze on the Xilinx website at

http://www.xilinx.com/picoblaze. Additionally, the hardware system and some software routines used in

this assignment are derived from PicoBlaze examples for the Spartan-3E Starter Kit board, also obtained

from the Xilinx website. The files you need to complete the lab assignment are posted on the class website;

you do not need to download anything from Xilinx.

PicoBlaze Processor

Obtain and unzip the file archive from the class website and use the resulting directory as your project

folder. You can move the directory anywhere you please as long as there are no spaces in the path to the

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