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    • 2. 发明授权
    • Control device for directing execution of forced operations in a data
processing system
    • 用于在数据处理系统中指示强制操作的控制装置
    • US4398247A
    • 1983-08-09
    • US186876
    • 1980-09-12
    • Dieter BazlenDietrich W. BockKlaus J. GetzlaffJohann HajduHelmut Painke
    • Dieter BazlenDietrich W. BockKlaus J. GetzlaffJohann HajduHelmut Painke
    • G06F9/48G06F9/26G06F9/30G06F9/318G06F9/38G06F9/46G06F9/18
    • G06F9/3867G06F9/268G06F9/30145G06F9/3836
    • In executing and controlling internal data flow for a particular program, it is often necessary to delay execution of an instruction by the insertion of an appropriate number of wait cycles. Thus, it may be necessary to interrupt instruction execution, for example, to insert a given number of wait cycles for channel access to common storage of the data processing system, for reloading a data or instruction buffer, or for a like situation. In such cases, the control unit has to ignore the particular instruction awaiting execution and execute another forced operation instead.An appropriate code is provided for a NO OPERATION instruction, say all bits zero. When a forced operation is to be executed, this code can be generated with fewer logic means at the output of the instruction register. As a result, there are no control signals active at the output of the decoder. The signals indicating forced operations have to be considered by the decoder only if a control signal is to be generated.If the control signals need be grouped for physical reasons, it is possible to determine which of these signals are a function of forced operations. This will negate the need to otherwise distribute these control signals throughout the decoder, thereby reducing and simplifying the wiring required.
    • 在执行和控制特定程序的内部数据流时,通常需要通过插入适当数量的等待周期来延迟指令的执行。 因此,可能需要中断指令执行,例如,将用于频道访问的给定数量的等待周期插入到数据处理系统的公共存储器中,用于重新加载数据或指令缓冲器或类似情况。 在这种情况下,控制单元必须忽略等待执行的特定指令,而不是执行另一个强制操作。 为NO OPERATION指令提供了一个适当的代码,比如说所有位为零。 当执行强制操作时,可以在指令寄存器的输出端以较少的逻辑方式生成该代码。 结果,在解码器的输出处没有控制信号有效。 仅当要生成控制信号时,必须由解码器考虑指示强制操作的信号。 如果控制信号由于物理原因需要分组,则可以确定这些信号中的哪一个是强制操作的功能。 这将消除在整个解码器中分发这些控制信号的需要,从而减少和简化所需的布线。