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    4.
    发明专利
    未知

    公开(公告)号：DE2718490A1

    公开(公告)日：1977-12-15

    申请号：DE2718490

    申请日：1977-04-26

    Applicant: IBM

    Inventor： LARSEN LARRY DONALD

    IPC: H03M5/00 ,  G06K7/10 ,  G11B20/10 ,  G11B20/14 ,  H03M5/12 ,  H03M5/14 ,  H04L25/48 ,  H04L25/49 ,  H03K13/00 ,  G11B5/09 ,  G06K7/00

    Abstract: A method for reading or decoding the self clocking encoded data content of digital data bits encoded in the standard F2F or in phase shift format is described. The method is useful for decoding F2F or phase shift code signals presented in the form of optic, magnetic, or electric signal variations presented to a decoding apparatus for the extraction of data therefrom. The technique utilizes the measurement of the interval of time or distance elapsing between two like polarity signal transitions to determine the data content of that segment of the waveform bounded by the two similar polarity transitions. The data content of that portion of the waveform or signal stream is defined in accordance with a logical matrix of values corresponding to the F2F or phase shift code formats used.

    7.
    发明专利
    未知

    公开(公告)号：DE3687666T2

    公开(公告)日：1993-08-12

    申请号：DE3687666

    申请日：1986-03-11

    Applicant: IBM

    Inventor： LARSEN LARRY DONALD ,  ESTEBAN DANIEL J

    IPC: G06F9/38 ,  G06F17/10 ,  G06F15/31

    Abstract: The architecture and instructions of the processor utilized in the present invention permit efficient accomplishment of signal processing tasks. A three phase pipelined operation for instructions exists consisting of fetch, decode, and execute operations. To provide additional flexibility and reduce branch latency, all of the instructions executed except for branch instructions are executed on phase three. Branch instructions are caused to execute at the end of phase two. The branching conditions may be on the basis of "hot bits" existing within the processor during the second cycle and resulting from the execution of the instruction just preceding the branch instruction. Conditional branches are performed based upon conditions not previously latched into registers that result from the execution of such instructions. These conditions are generated at the same time that the branch will be executed. The conditions which may be used to trigger a branching decision may also result from the ALU operation output or from the state of a selected data bus bit. The instructions providing the branch conditions must not be separated from the associated branch instruction. Therefore, to prevent separation of these two instructions, interrupt protection is always provided for such sequences. Indirect branching is also accommodated by making available the contents of a common data bus to be placed in the instruction address register that would be branched to. The contents of the data bus depend upon the instruction which executes simultaneously with the branch instruction, i.e., that which is in the third phase in the pipeline. @Interrupt protection is therefore required for these types of branching actions as well.

    8.
    发明专利
    未知

    公开(公告)号：DE3687666D1

    公开(公告)日：1993-03-18

    申请号：DE3687666

    申请日：1986-03-11

    Applicant: IBM

    Inventor： LARSEN LARRY DONALD ,  ESTEBAN DANIEL J

    IPC: G06F9/38 ,  G06F17/10 ,  G06F15/31

    Abstract: The architecture and instructions of the processor utilized in the present invention permit efficient accomplishment of signal processing tasks. A three phase pipelined operation for instructions exists consisting of fetch, decode, and execute operations. To provide additional flexibility and reduce branch latency, all of the instructions executed except for branch instructions are executed on phase three. Branch instructions are caused to execute at the end of phase two. The branching conditions may be on the basis of "hot bits" existing within the processor during the second cycle and resulting from the execution of the instruction just preceding the branch instruction. Conditional branches are performed based upon conditions not previously latched into registers that result from the execution of such instructions. These conditions are generated at the same time that the branch will be executed. The conditions which may be used to trigger a branching decision may also result from the ALU operation output or from the state of a selected data bus bit. The instructions providing the branch conditions must not be separated from the associated branch instruction. Therefore, to prevent separation of these two instructions, interrupt protection is always provided for such sequences. Indirect branching is also accommodated by making available the contents of a common data bus to be placed in the instruction address register that would be branched to. The contents of the data bus depend upon the instruction which executes simultaneously with the branch instruction, i.e., that which is in the third phase in the pipeline. @Interrupt protection is therefore required for these types of branching actions as well.

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