方法1:利用多选择语句自顶向下的优先特性 library ieee use ieee std logic 1164.all entity priority is port(signal yo, y1, y2,y3, y4, y5, y6,y7:in std logici signal vec: out std logic vector (2 downto 0))i end priority. architecture behavior of priority is begin process(yo, yl, y2, y3,y4, y5, y6,y7 begin if (y7=1)then vec<=111"i elsif (y6='1')then vec<=110 i elsif (y5=1)then vec<=101 i elsif (y4=1)then vec<=100 i elsif (y3=1)then vec<=011 i elsif (y2='1)then vec<=010i elsif (yl=1)then vec<=001i elsif (yo=f1')then vec<=000 i end ifi end processi end behavior4 方法1：利用 if 多选择语句自顶向下的优先特性