Resources Contact Us Home
Microcode control mechanism utilizing programmable microcode repeat counter

Image Number 7 for United States Patent #4556938.

A microcode control mechanism is provided for producing the sequences of microwords used to control the execution of processor instructions in a microprogrammed data processor. This microcode control mechanism includes sequence counter circuitry for supplying a sequence of numbers and a programmable logic array mechanism responsive to the processor instruction and to the sequence of numbers for producing a sequence of microwords needed to execute the instruction. The microcode control mechanism also includes repeat circuitry responsive to a predetermined microword produced by the programmable logic array mechanism for setting the sequence counter circuitry back to a count which is less than the current count for causing a selected portion of the microword sequence to be repeated. The microcode control mechanism further includes a programmable repeat counter for counting the number of times the selected portion is repeated and for disabling the repeating action after a selected number of repeats.

  Recently Added Patents
Vehicle grille
Method of operating an election ballot printing system
Circuit board having semiconductor chip embedded therein
Autobrake and decel control built-in test equipment
Routing of data including multimedia between electronic devices
Sublingual coated tablet of fentanyl
  Randomly Featured Patents
ECL logic gate with voltage protection
Method for depositing porous films
Axle assembly with bearing adjustment mechanism
Drinking mug
Foldable plastic box
Reactive catalyst for amino resins
Overlay metrology target
Safety measures for lifting slings
Air compressor