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    • 8. 发明授权
    • Microprogrammed system having hardware interrupt apparatus
    • 具有硬件中断装置的微编程系统
    • US4484271A
    • 1984-11-20
    • US392500
    • 1982-06-28
    • Ming T. MiuJohn J. BradleyJian-Kuo Shen
    • Ming T. MiuJohn J. BradleyJian-Kuo Shen
    • G06F9/26
    • G06F9/268
    • A hardware interrupt apparatus for assigning the microprogrammed control system to the highest priority hardware interrupt requesting service. In a microprogrammed control system having at least one hardware interrupt, the presence of a hardware interrupt request will cause the interruption of the currently executing microprogram at the end of the current microinstruction. The address of the next microinstruction in the interrupted microprogram is saved in a hardware interrupt return address register and the next microinstruction address is generated as a function of the particular hardware interrupt to be serviced. A microprogram dedicated to servicing the particular hardware interrupt is then entered at the hardware interrupt generated next microinstruction address. Logic is provided within each microinstruction to inhibit hardware interrupts. Logic is provided within each microinstruction to indicate that the address of the next microinstruction should be taken from the hardware interrupt return address register, thereby allowing for the resumption of the interrupted microprogram. The hardware interrupt apparatus is further organized such that the entry to a second hardware interrupt service microprogram can be made upon the completion of a first hardware interrupt service microprogram without having to return to the original microprogram interrupted by the first hardware interrupt. Upon completion of the second hardware interrupt microprogram service routine, return can be made to the original microprogram interrupted by the first hardware interrupt.
    • 一种硬件中断装置,用于将微程序控制系统分配给最高优先级的硬件中断请求服务。 在具有至少一个硬件中断的微程序控制系统中,存在硬件中断请求将导致在当前微指令结束时当前执行的微程序的中断。 中断微程序中的下一个微指令的地址被保存在硬件中断返回地址寄存器中,并且根据要维护的特定硬件中断产生下一个微指令地址。 然后在产生下一个微指令地址的硬件中断输入专用于维护特定硬件中断的微程序。 在每个微指令内提供逻辑以禁止硬件中断。 在每个微指令内提供逻辑,以指示下一个微指令的地址应从硬件中断返回地址寄存器中取出,从而允许恢复中断的微程序。 硬件中断装置被进一步组织,使得可以在完成第一硬件中断服务微程序之后进入到第二硬件中断服务微程序,而不必返回到由第一硬件中断中断的原始微程序。 在完成第二个硬件中断微程序服务程序后,可以返回由第一个硬件中断中断的原始微程序。