这句话是什么意思?vhdl语法上这样规定吗?解决方法

这句话是什么意思?vhdl语法上这样规定吗?
when idle => oe<='1';
  we<='1';
 ^……
vhdl语法上这个是什么意思?

------解决方案--------------------
Do you mean

when idle => 
oe<='1';
we<='1';

Is the whole thing in a case statement and this is just one of the case branch?