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Partial Duplex And Execution Of Instructions

IP.com Disclosure Number: IPCOM000054533D
Original Publication Date: 1980-Feb-01
Included in the Prior Art Database: 2005-Feb-13

Publishing Venue

IBM

Related People

Authors:
Shen, DT Miller, RE [+details]

Abstract

The design of all general purpose digital computers in current use is based on the concept of the stored program. In a stored program computer, the sequence of instructions activating the logic and arithmetic is stored in the same way as data, and both instructions and data are accessed by the same selection mechanics. In general, the execution of an instruction consists of the following steps: 1. Instruction fetching from main storage (IF) 2. Instruction decode (D) 3. Data address computation (AG) 4. Data address request to storage or store to storage (SAB) 5. Data access from/to storage (SBD) 6. Logic or arithmetic operation (EX) 7. End op (EOP) 8. Increment Instruction Counter.