分类Verilog 教程高级篇 关键词: specify, 路径延迟 路径延迟用关键字 specify 和 endspecify 描述,关键字之间组成 specify 块语句。 specify 是模块中独立的一部分,不能出现在其他语句块(initial, always 等)中。 specify 块语句主要有以下功能: 指定所有路径中引脚到引脚的延迟; 定义s
specify block用来描述从源点(source:input/inout port)到终点(destination:output/inout port)的路径延时(path delay),由specify开始,到endspecify结束,并且只能在模块内部声明,具有精确性(accuracy)和模块性(modularity)的特点。specify block可以用来执行以下三个任务: 一、描述横穿整个模块的各种路径及其延时。(module ...
output out, input a, b, c, d); specify (a => out) = 2.5 ; (b => out) = 2.5 ; (c => out) = 3.5 ; (d => out) = 3.5 ; endspecify wire an1, an2 ; and (an1, a, b); and (an2, c, d); and (out, an1, an2); endmodule 可以用关键字 specparam 在 specify ...
一个带有路径延迟的 4 输入的与逻辑模块模型描述如下: 登录后复制moduleand4( outputout, input a, b, c, d); specify (a =>out) =2.5; (b =>out) =2.5; (c =>out) =3.5; (d =>out) =3.5; endspecify wire an1, an2 ; and (an1, a, b); and (an2, c, d); and (out, an1...
模块路径延迟是由specify块描述的,specify块是模块内包围在specify和endspecify之间的部分。specify块有如下用途。 描述模块路径(Module path),把延迟赋给这些路径。 执行时序检查(Timing check),确保模块输入端口上发生的事件满足模块的时序约束(Timing constraint)。
ifnone (X *> Z) = 3; // State-dependent path pulsestyle_ondetect Q; // Verilog-2001 (D => Q) = (4, 6); showcancelled S; // Verilog-2001 (R => S) = (2, 3) $setup(D, posedge Clk, 2.8); // System timing check endspecify See also: Specparam, Timing checks...
module and4( output out, input a, b, c, d); specify specparam ab_2_out = 2.5 ; specparam cd_2_out = 2.5 ; (a => out) = ab_2_out ; (b => out) = ab_2_out ; (c => out) = cd_2_out ; (d => out) = cd_2_out ; endspecify wire an1, an2 ; and (an1, ...
To this end, we use a path finding algorithm (BFS) based on breadth-first search. BFS finds all paths from a start node to a goal node and the set of all shortest paths is extracted. We check if the path found by each algorithm is included in the set of all shortest paths for ...
Footer, of type object, specifies the string, binding, or view that will be displayed at the end of the list. FooterTemplate, of type DataTemplate, specifies the DataTemplate to use to format the Footer. These properties are backed by BindableProperty objects, which means that the properties ca...
For character data fields, optional terminating characters allow you to mark the end of each field in a data file with afield terminatorand the end of each row with arow terminator. Terminating characters are one way to indicate to programs that read the data file where one field or row e...