GDB021BE01 HIEE300766R0001 闸门控制单元

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GDB021BE01 HIEE300766R0001根据用户预先编好的程序，依次从存储器中取出各条指令，放在指令寄存器IR中，通过指令译码(分析)确定应该进行什么操作，GDB021BE01 HIEE300766R0001然后通过操作控制器OC，按确定的时序，向相应的部件发出微操作控制信号。操作控制器OC中主要包括节拍脉冲发生器、控制矩阵、时钟脉冲发生器、复位电路和启停电路等控制逻辑。

GDB021BE01 HIEE300766R0001 无论哪一个种类的控制单元，原理均为通过控制单元发出的控制信号对CPU各个部分加以控制。控制单元GDB021BE01 HIEE300766R0001大体可以分为以下两类。

微程序式，由微程序读取和发出控制信号。通过被称为微型定序器的简单数字通路（微型电脑）对微程序加以执行。

硬件型控制单元。由数字通路直接发出控制信号。由于集成电路的规模化及设计技术的进步，此种控制单元已成为可能。

The CPU (central processing unit) acts as the "big boss" in the computer to issue instructions to the controller, and the actual physical data transfer is performed by the control unit itself.

The control unit reads one or more new instructions from the memory (or instruction cache), decodes them and dispatches them into units where the corresponding function is executed. The control unit is also responsible for setting registers in the various data paths to ensure that instructions are executed on the correct operation values stored in the registers.

In a CISC processor, the control unit is itself a small processor that executes a microcode program stored in the rom region that specifies the correct latches and data transfer sequence for each type of macro instruction.