11~12EDA期末试卷A答案.doc

填空： 1、 entity 、 nor2 、 y=not(a or b) 2、 q:out std_logic 、 clkevent and clk=1 、 end if 第一处： y:out std_logic 改为y:out std_logic_vector(7 downto 0) 第二处： architecture bhv is 改为architecture bhv of dc38 is 第三处： case a is 改为case indate is 第四处： 在end case; 后加 end process; 寄存器传输级 SOPC 可编程片上系统 EAB 嵌入式阵列块 编程 1. Architecture one of mymux is Begin Process (sel, ain, bin) Begin If sel = “00” then cout = ain or bin; Elsif sel = “01” then cout = ain xor bin; Elsif sel = “10” then cout = ain and bin; Else cout = ain nor bin; End if; End process; End one; Architecture two of mymux is Begin Process (sel, ain, bin) Begin Case sel is when “00” = cout = ain or bin; when “01” = cout = ain xor bin; when “10” = cout = ain and bin; when others = cout = ain nor bin; End case; End process; End two; Architecture three of mymux is Begin Cout = ain or bin when sel = “00” else Ain xor bin when sel = “01” else Ain and bin when sel = “10” else ain nor bin; End three; 2 该状态机为moore型状态机，输出数据outa和输入ina没有直接逻辑关系，outa是时钟clk的同步时序逻辑。 5 Library ieee; Use ieee.std_logic_1164.all; 2 Entity mooreb is Port (clk, reset : in std_logic; Ina : in std_logic_vector (1 downto 0); Outa : out std_logic_vector (3 downto 0) ); 3 End mooreb; Architecture one of mooreb is Type ms_state is (st0, st1, st2, st3); Signal c_st, n_st : ms_state; 3 Begin Process (clk, reset) 4 Begin If reset = ‘1’ then c_st = st0; Elsif clk’event and clk = ‘1’ then c_st = n_st; End if; End process; Process (c_st) 8 Begin Case c_st is When st0 = if ina = “00” then n_st = st0; Else n_st = st1; End if; Outa =