进程的变量赋值设计实例 素数检测器的进程设计p290表456 process(n) variable n31 n0, n31 n2l nI, n2I n1 n0, n2 nll n0: std logic; begin n3 n0 not n 3)and n(0); n31 n2I n1: = not n 3 )and not n (2)and n (1); n2I n1 n0 not n(2)and n(1)and n(O) n2 nll n0 = n(2)and not n(1)and n(O) f<=n31 n0 or n31 n2I nl or n2I nI n0 or n2 nll n0; end process进程的变量赋值设计实例 素数检测器的进程设计 p.290 表4-56 process(n) variable n3l_n0,n3l_n2l_n1, n2l_n1_n0 ,n2_n1l_n0:std_logic; begin n3l_n0 := not n(3) and n(0); n3l_n2l_n1 := not n(3) and not n(2) and n(1); n2l_n1_n0 := not n(2) and n(1) and n(0); n2_n1l_n0 := n(2) and not n(1) and n(0); f<= n3l_n0 or n3l_n2l_n1 or n2l_n1_n0 or n2_n1l_n0; end process;