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Central Control Unit Instruction Prefetch Mechanism Disclosure Number: IPCOM000049581D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09

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Lechaczynski, M Pauporte, A Thery, P Waller, R [+details]


The central control unit (CCU) instruction prefetch is a hardware mechanism which allows up to four instructions to be loaded into four preoperation (POP) registers from main storage. Two instructions are loaded into two POP registers at the same time via a 4-byte main store interface. This instruction fetch is overlapped with the instruction execution. The prefetched instructions will be valid and executed unless a branch instruction is predetected.