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    • 3. 发明授权
    • Logic circuitry for selection of dedicated registers
    • 用于选择专用寄存器的逻辑电路
    • US4006457A
    • 1977-02-01
    • US550338
    • 1975-02-18
    • Edward C. HepworthRodney J. MeansCharles I. Peddle
    • Edward C. HepworthRodney J. MeansCharles I. Peddle
    • G06F15/78H04Q9/00G11C17/00H04L5/00
    • G06F15/7864
    • An MOS (Metal-Oxide-Semiconductor) integrated circuit includes four dedicated registers thereon, two of which are "write only" registers having the capability of being written into, but not read from, by means of buffer circuitry for coupling a bidirectional data bus to the dedicated registers. The other two dedicated registers are "read only" registers having the capability of being read from, but not written into, by means of the buffer circuitry. The integrated circuit chip is itself addressable by means of a plurality of address conductors of an address bus coupleable to the integrated circuit chip, and the four dedicated registers within the integrated circuit chip are further addressable by means of an additional address conductor called a register select address line. A control input conductor is coupled to the integrated circuit chip and is used to control the direction of data flow of the buffer circuitry and is also used in conjunction with the register select address line to select one of four dedicated registers. This provides the advantage of reducing the number of external connections required for the integrated circuit chip, and is possible only because the registers are dedicated.
    • MOS(金属氧化物半导体)集成电路包括四个专用寄存器,其中两个是“只写入”寄存器,其具有通过用于耦合双向数据总线的缓冲电路写入但不从其读取的能力 到专用寄存器。 另外两个专用寄存器是具有通过缓冲电路读取但不写入的能力的“只读”寄存器。 集成电路芯片本身可通过可与集成电路芯片耦合的地址总线的多个地址导体来寻址,并且集成电路芯片内的四个专用寄存器可通过称为寄存器选择的附加地址指令进一步寻址 地址栏。 控制输入​​导体耦合到集成电路芯片,并用于控制缓冲电路的数据流动方向,并结合寄存器选择地址线选择四个专用寄存器之一。 这提供了减少集成电路芯片所需的外部连接数量的优点,并且可能仅仅是因为寄存器是专用的。