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Entry point mapping and skipping method and apparatus

  • US 5,032,983 A
  • Filed: 09/18/1989
  • Issued: 07/16/1991
  • Est. Priority Date: 04/10/1987
  • Status: Expired due to Term
First Claim
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1. In a method for executing a macro-instruction with a series of microcode instructions stored in a microcode memory, an improved method for addressing the memory comprising the steps of:

  • (a) providing an entry point address of said microcode memory to an address register for said macroinstruction;

    (b) repeatedly incrementing said address register by a first predetermined number (F) greater than one to provide an address of a next microcode instruction in said microcode memory, in a first, skipping mode such that microcode instructions for other macro-instructions are skipped over;

    and incrementing said address register by one in a second, normal mode, such that addresses can be automatically incremented in both said first and second modes without reference to said microcode instructions for an increment amountwhereby to obtain the address of the next microinstruction during the execution of the macroinstruction the current address is first incremented by said first predetermined number and subsequently incremented by one without reference to the microinstructions.

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