为了验证FPGA工程中的某个模块的功能和时序的正确性,常常需要对其单独进行验证,但是这些模块通常都与内部的众多信号相连(如系统总线,中断信号线等),往往一个模块的对外接口引脚会多达几百个,对其单独仿真的话,可能会对目标FPGA造成IO资源不足的情况.即使IO资源满足,当众多内部信号变成IO信号时,模块内部的信号将增加额外的IO延时,增加了时序约束的复杂度. 在编译时会出现类似错误: Error: Can't place 108 pins with 2.5 V I/O standard becau
1.Found clock-sensitive change during active clock edge at time <time> on register "<name>"原因:vector source file中时钟敏感信号(如:数据,允许端,清零,同步加载等)在时钟的边缘同时变化.而时钟敏感信号是不能在时钟边沿变化的.其后果为导致结果不正确.措施:编辑vector source file 2.Verilog HDL assignment warn
Verilog 常见错误汇总 1.Found clock-sensitive change during active clock edge at time <time> on register "<name>" 原因:vector source file中时钟敏感信号(如:数据,允许端,清零,同步加载等)在时钟的边缘同时变化.而时钟敏感信号是不能在时钟边沿变化的.其后果为导致结果不正确. 措施:编辑vector source file 2.Verilog HD
步骤1 新建或打开Quartus II工程,用QII自带文本编辑器打开HDL文件. 图1 用QII自带的文本编辑器打开HDL文件 步骤2 选择File>Create / Update>Creat Symbol Files for Current File,等待图3所示画面出现即可. 图2 选择Creat Symbol Files for Current File 图3 创建成功 现在通过File>Open,就可以打开相应的bsf文件了. 图4 生成的bsf文件 说明 通过File>
问题: Given an array of integers, every element appears three times except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? Single Number I 升级版,一个数组中其它数出现了
A 2d grid map of m rows and n columns is initially filled with water. We may perform an addLand operation which turns the water at position (row, col) into a land. Given a list of positions to operate, count the number of islands after each addLand o
Single Number I : Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? Solution: 解法不少,贴一种: class
Quartus II 9.0版本的时候软件还有自带的仿真工具,现在安装的是11.0以上版本,才发现 Quartus II 11.0以上取消了软件自带的波形仿真工具,因此需要波形仿真就要调用专业的仿真工具Modelsim. 刚开始几天非常不习惯使用Modelsim,总觉得各种麻烦和不习惯,一度有想换回9.0版本的冲动,但是想想技术总是往前发展的,既然Quartus 取消了自带的仿真,而使用专业的仿真工具Modelsim总是有其自己的道理,所以还是决定学习新技术.经过几天的学习加练习,总算是熟练了一