BSM80C-250AH

1、控制存儲器（contmlMemory）用來存放各機器指令對應(yīng)的微程序。譯碼器用來形成機器指令對應(yīng)的微程序的入口地址。當將一條機器指令對應(yīng)的微程序的各條微指令逐條取出，并送到微指令寄存器時，其微操作命令也就按事先的設(shè)計發(fā)出，因而也就完成了一條機器指令的功能。對每一條機器指令都是如此。
2、微指令的寬度直接決定了微程序控制器的寬度。為了簡化控制存儲器，可采取一些措施來縮短微指令的寬度。如采用字段譯碼法一級分段譯碼。顯然，微指令的控制字段將大大縮短。，一些要同時產(chǎn)生的微操作命令不能安排在同一個字段中。為了進一步縮短控制字段，還可以將字段譯碼設(shè)計成兩級或多級。

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