【例9-2】 SIGNAL value: INTEGER RANGE O TO 15; SIGNAL outl: STD LOGIC i CASE value Is 缺少以WHEN引导的条件句 END CASE CASE value is WHEN0=>outl<='I’; value2~15的值未包括进去 WhEN I=>out1<=0 END CASE CASE value Is WHEN0To10=>0ut1<='1’; 选择值中5~10的值有重叠 WHEN 5TO 15=>out1<=0 END CASE【例9-2】 SIGNAL value : INTEGER RANGE 0 TO 15; SIGNAL out1 : STD_LOGIC ; ... CASE value IS -- 缺少以WHEN引导的条件句 END CASE； ... CASE value IS WHEN 0 => out1<= '1' ; -- value2～15的值未包括进去 WHEN 1 => out1<= '0' ; END CASE ... CASE value IS WHEN 0 TO 10 => out1<= '1'; -- 选择值中5～10的值有重叠 WHEN 5 TO 15 => out1<= '0'; END CASE;