该功能块把数据和数据屏蔽(MSK)结合起来。执行的操作(AND/OR)是由OP参数选择的。屏蔽数值是双字数据。当对一个单字数据操作时,只有屏蔽数据的低16位被使用。当对一个字节数据操作时,只有屏蔽数据的低8位被使用。然后结果被重新写入读取数据的那个相同VME地址。当操作成功时,BUS_ RMW功能块向右传送能流,并返回一个状态值到ST输出。.
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