激励文件程序: 1libraryieee;2useieee.std_logic_1164.all;3useieee.std_logic_arith.all;4useieee.std_logic_unsigned.all;56entitytb_and2is7endentity;89architectureaoftb_and2is10componentand2is11generic(rise,fall:TIME);12port(a,b:INbit;c:OUTbit);13endcomponent;1415signala_t :bit;16signalb_...
在VHDL中,generic参数通常在实体(entity)声明部分进行定义,其基本语法如下: vhdl entity entity_name is generic ( parameter_name : data_type := default_value; -- 可以定义多个参数,每个参数之间用分号分隔 ); port ( -- 端口声明 ); end entity entity_name; 在实例化实体时,可以使用generic map子句来...
a: IN STD_LOGIC_VECTOR(n-1 DOWNTO 0); c: OUT STD_LOGIC); END COMPONENT ;BEGIN u1: andn GENERIC MAP (n =>2) PORT MAP (a(0)=>d1,a(1)=>d2,c=>q1);第3章 VHDL程序结构23 u2: andn GENERIC MAP (n =>5) PORT MAP (a(0)=>d3,a(1)=>d4,a(2)=...
well..that's not a helpful answer to a VHDL beginner :( "Duty" is defined as type NATURAL in the package. how can I pass the value from the top level entity? What type the "n" should be is my question. (n should vary its value at the top level entity - in a loop) Tran...
A generic constant is given an actual value when the entity is used in a component instantiation statement and including a generic map does this. Writing a generic map is a simple task. One can use positional association, named association or a combination of both and can omit actual values ...
port map ( in1 => in_a, nclk => nclk, q => re(0 to 7) ); -- Quartus 9.1 generates an error: Error (10349): VHDL Association List error at re_ots.vhdl(145): formal "init" does not exist === How do I fix this? Thanks ...
PORT (a,b:IN STD_LOGIC; S,co:OUT STD_LOGIC); END COMPONENT; SIGNAL u0_co,u0_s,u1_co:STD_LOGIC; BEGIN U0:half_adder PORT MAP (a,b,u0_s,u0_co); U1:half_adder PORT MAP (u0_s,cin,sum,u1_co); Co <= u0_co OR u1_co; END full1; 半加器及全加器VHDL程序设计(2)。 LIBR...
generic map ( Tpd_ab_s => (7 downto 1 => 120 ps, 0 => 80 ps), width => byte‘length ) though to do so might look a bit strange. VHDL-87, -93, and -2002 These versions of VHDL do not allow the value of one generic constant to be used in the declarations of other gener...
下降延时等参数加到类属参数表中然后根据这些参数进行定制这对于系统仿真控制是十分方便的其中的常数名是由设计者确定的类属常数名数据类型通常取 INTEGE R 或TIME 等类型设定值即为常数名所代表的数值但需注意VHDL 综合器仅支持数据类 型为整数的...
PORT(a: IN STD_LOGIC_VECTOR(n-1 DOWNTO 0); c: OUT STD_LOGIC); END COMPONENT ; BEGIN u1: andn GENERIC MAP (n =>2) PORT MAP (a(0)=>d1,a(1)=>d2,c=>q1); u2: andn GENERIC MAP (n =>5) ...