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    • 1. 发明授权
    • Microprogram-controlled device comprising a control storage device with
a small storage capacity
    • 微程序控制装置包括具有小存储容量的控制存储装置
    • US5297264A
    • 1994-03-22
    • US872406
    • 1992-04-23
    • Takao KishiKiyoshi Iwase
    • Takao KishiKiyoshi Iwase
    • G06F9/22G06F9/26G06F9/40
    • G06F9/267
    • In a microprogram-controlled device operable under the control of a microprogram, a control storage device (10) comprises a control storage unit (11) memorizing a plurality of microinstructions each including a plurality of every second microinstruction addresses in number less than the maximum number of available branches for the microprogram. A bank switching unit (12) selects, as a selected microinstruction (SMI), one of the next microinstructions on the basis of a branch information signal (BI). A microinstruction register (13) holds the selected microinstruction as a current microinstruction. A branch control unit (15) processes a branch condition signal (BCD), a branch control signal (BCT), a branch classification signal (BCF), and a branch condition selection signal (BCS) into the branch information signal, an address selection signal (AS), and an address modifying signal (AM). An address selector (16) selects, as a selected microinstruction address (SMIA), one of the every second microinstruction addresses on the basis of the address selection signal. An address modifier (17) modifies the selected microinstruction address into a modified microinstruction address (MMIA) on the basis of the address modifying signal and an address modifying selection signal (AMS). The address modifier supplies an address register (14) with the modified microinstruction address.
    • 在微程序控制装置中,在微程序控制下可操作的微程序控制装置,控制存储装置(10)包括存储多个微指令的控制存储单元(11),每个微指令包括多个小于最大数目的第二微指令地址 的可用分支为微程序。 银行切换单元(12)基于分支信息信号(BI)来选择下一个微指令之一作为所选微指令(SMI)。 微指令寄存器(13)将选定的微指令保持为当前微指令。 分支控制单元(15)将分支条件信号(BCD),分支控制信号(BCT),分支分类信号(BCF)和分支条件选择信号(BCS)处理到分支信息信号中,地址选择 信号(AS)和地址修改信号(AM)。 地址选择器(16)基于地址选择信号选择每个第二微指令地址中的一个作为所选微指令地址(SMIA)。 地址修改器(17)基于地址修改信号和地址修改选择信号(AMS),将所选择的微指令地址修改为修改的微指令地址(MMIA)。 地址修改器提供具有修改的微指令地址的地址寄存器(14)。