component 硬件执行：并发执行（VHDL本质）仿真执行：顺序执行、并发执行分为两大类：顺序（Sequential）描述语句并发（Concurrent）描述语句 1 顺序描述语句：执行顺序与书写顺序一致，与传统软件设计语言的特点相似。顺序语句只能用在进程与子程序中。常用的顺序描述语句：赋值语句；if语句；case语句；loop语句；next语句；...
Being a sequential statement, assertion statements can be included anywhere in a process body. One can write an assertion statement with either a report clause or a severity clause, or both. Assertion statements are also used for checking the timing constraints that apply to a model....
VHDL顺序语句Sequential.ppt,3)while … loop 语句 例:sum:=0; i:=0; abcd: while (i10) loop sum:=sum+i; i:=i+1; end loop abcd; 注:循环变量 i 需事先定义、赋初值,并指定 其变化方式。一般综合工具不支持 while … loop 语句。 三 wait 语句 进程在仿真时的两个状态
1、1,硬件执行:并发执行(VHDL本质) 仿真执行:顺序执行、并发执行 分为两大类:顺序(Sequential)描述语句 并发(Concurrent)描述语句,ARCHITECTURE Process Process,ENTITY,Sequential Process,CombinationalProcess,ports,ports,component,VHDL顺序语句(Sequential),2,顺序描述语句: 执行顺序与书写顺序一致,与传统软件设计 语言...
A VHDL process is sequential (as opposed to combinatorial) when some assigned signals are not explicitly assigned in all paths within the process. The generated hardware has an internal state or memory (Flip-Flops or Latches). Recommended: Use a sensitiv
The two inputs Clock and Reset are created within their own process statements. Sign in to download full-size image Figure 6.77. VHDL test bench for the four-bit binary counter The output from this counter was taken from the flip-flop Q outputs. However, there are three possible ways to ...
Processes in VHDL • Processes Describe Sequential Behavior • Processes in VHDL Are Very Powerful Statements • Allow to define an arbitrary behavior that may be difficult to represent by a real circuit • Not every process can be synthesized ...
Inside the “process”, there are two “if” statements. The “if” statements of VHDL are similar to the conditional structures utilized in computer programming languages. When the condition after the “if” keyword is true, the statements after the “then” keyword will be...
5) sequential statements 顺序语句 1. Summarized the concurrent statements andsequential statementsof VHDL language,and described their types and the char-acteristic . 简单概述了VHDL语言的并行语句和顺序语句,描述了其种类和特点。 6) orders of adjectives ...
VHDL provides concurrent statements to document parallel operations or to abstractly model an ultimate circuit in a behavioral manner. These statements can be executed by a simulator at the same simulated time. Within a process, sequential statements specify the step-by-step behavior of the process...