Instruction decode method and arrangement suitable for a decoder of
microprocessors
    1.
    发明授权
    Instruction decode method and arrangement suitable for a decoder of microprocessors 失效
    指令解码方法和布置适用于微处理器的解码器

    公开(公告)号:US4975839A

    公开(公告)日:1990-12-04

    申请号:US204299

    申请日:1988-06-09

    IPC分类号: G06F9/22 G06F9/30

    CPC分类号: G06F9/223 G06F9/30145

    摘要: An instruction decode method and arrangement suitable for a high-speed microprocessor are disclosed. The instruction decode arrangement comprises a high-speed PLA decoder of small capacity for decoding an instruction word having a small execution cycle, a low-speed PLA decoder of large capacity for decoding an instruction word having a large execution cycle, and a circuit for activating the low-speed PLA decoder to cause it to execute instruction decoding when the high-speed PLA decoder is not permitted for the execution of instruction decoding. Instantaneous current noises generated in the PLA decoders can be mitigated to avoid erroneous operations without degrading averaged decoding performance, thereby permitting the microprocessor to operate at high speeds.

    摘要翻译: 公开了适用于高速微处理器的指令解码方法和装置。 指令解码装置包括一个用于解码执行周期小的指令字的小容量的高速PLA解码器,用于解码具有大执行周期的指令字的大容量的低速PLA解码器,以及用于激活的电路 低速PLA解码器,当高速PLA解码器不被允许执行指令解码时,使其执行指令解码。 PLA解码器中产生的瞬时电流噪声可以减轻以避免错误的操作,而不降低平均解码性能,从而允许微处理器以高速运行。

    Information processing apparatus having micro instructions stored both
in on-chip ROM and off-chip memory
    7.
    发明授权
    Information processing apparatus having micro instructions stored both in on-chip ROM and off-chip memory 失效
    具有存储在片上ROM和片外存储器中的微指令的信息处理装置

    公开(公告)号:US5274829A

    公开(公告)日:1993-12-28

    申请号:US114720

    申请日:1987-10-28

    CPC分类号: G06F9/268 G06F9/26 G06F9/328

    摘要: A data processing apparatus which allows a large number of micro instructions to be read at high speeds by storing frequently used micro instructions in the on-chip ROM and those less frequently used in the off-chip memory. From the address of the micro instruction to be accessed, it is determined whether the micro instruction is stored in the on-chip ROM or the off-chip memory, and the micro instruction is accessed on the basis of this determination. A cache memory may also be provided on the chip for providing high speed repeat access to micro instructions stored in the off-chip memory.

    摘要翻译: 一种数据处理装置,其通过将经常使用的微指令存储在片上ROM中以及在片外存储器中较少使用的微指令,允许以高速读取大量微指令。 根据要访问的微指令的地址,确定微指令是存储在片上ROM还是片外存储器中,并且基于该确定来访问微指令。 还可以在芯片上提供高速缓冲存储器,以提供对存储在片外存储器中的微指令的高速重复访问。