1 signal name : type [range] [:= initial_vaule]; 还有 常量 constant 声明: 1 constant name : type := value; 还有 变量 variable 声明 1 variable name : type [range] [:= initial_vaule]; Pre-defined Data Types bit & bit_vecto
Concurrent signal assignments are concurrently active and re-evaluated when any signal on the right side of the assignment changes value. The re-evaluated result is assigned to the signal on the left-hand side. Supported types of concurrent signal assign
vhdl编程语言书籍 涵盖VHDL语法基础，从基本语句结构到复杂的并发与顺序语句，为读者搭建坚实的语言学习框架，例如详细阐述信号（Signal）与变量（Variable）在不同场景下的使用规范与差异。深入解析VHDL的设计层次结构，包括实体（Entity）、架构（Architecture）、包（Package）等概念，结合实际案例说明如何利用这些结构构建...
1. signal assignment 2. library 3. package 4. process 5. signal 6. constant 7. variable 8. array 9. function 10. procedure 三、简答题(每题10分,共30分) 1.简述VHDL中进程(process)的作用和基本结构。 2.描述VHDL中信号(signal)和变量(variable)的区别。 3.简述VHDL中时序逻辑和组合逻辑的区别。
顺序语句(1) 能够进行并行处理的语句有:process -进程语句Concurrent signal assignment-并发信号代入语句 Concurrent procedure call-并发过程调用语句Block-模块语句Assert-并行断言语句Generate-重复结构生成语句Generic-元件参数化语句(2) 顺序语句列述如下:Variable assignment statement -变量的赋值语句Signal assignment ...
out package port postponed procedure process pure range record register reject rem report return rol ror select severity signal shared sla sll sra srl subtype then to transport type unaffected untis until use variable wait when while with xnor xor active ascending ascending base delayed ...
out package port postponed procedure process purerangerecord register reject rem reportreturnrol ror select severity signal shared sla sll sra srl subtype then to transporttypeunaffected untis until use variable wait whenwhilewithxnor xor active ascending ascending base delayed ...
SIGNAL signal_name: type_name [:= initial_value];–使用新的数组类型对SIGNAL，CONSTANT, VARIABLE进行声明 例如：TYPE delay_lines IS ARRAY (L-2 DOWNTO 0) OF SIGNED (W_IN-1 DOWNTO 0);–滤波器输入延迟链类型定义 TYPE coeffs IS ARRAY (L-1 DOWNTO 0) OF SIGNED (W_COEF-1 DOWNTO 0);–...
VHDL：VHSIC(VeryHighSpeedIntegratedCircuit)HardwareDescriptionLanguage 1.2VHDL的历史 nIEEE工业标准硬件描述语言n用于仿真及综合的高级描述语言80年代初由美国国防部在实施超高速集成电路（VHSIC）项目时开发的。1987年IEEE协会批准为IEEE工业标准称为IEEE1076-1987。1993年被更新为93标准，IEEE1076....
一、 一、Sequential Assignment Statements Sequential Assignment Statements 顺序语句——在进程(PROCESS )或子程序 (PROCEDURE)、函数(FUNCTION)中使用,按程序 书写的顺序自上而下、一个一个语句地执行; 并行语句——出现在结构体中,各语句并行(同步)