方法3:利用条件赋值语句 architecture behavior of priority is begin vec <=111 when y7=1 else 110 when y6=else 4101” when y5=1else 100 when y4=else 011” when y3=1'else 010 when y2=else 001 when y1=else 0002 when y0= 1'else XXX” end behavior6 方法3：利用条件赋值语句 architecture behavior of priority is begin vec <= “111” when y7 = ‘1’ else “110” when y6 = ‘1’ else “101” when y5 = ‘1’ else “100” when y4 = ‘1’ else “011” when y3 = ‘1’ else “010” when y2 = ‘1’ else “001” when y1 = ‘1’ else “000” when y0 = ‘1’ else “XXX”; end behavior;