Patent · US Expired

Address selective emulation routine pointer address mapping system

US5392408A · kind A · utility

23Cited by
9References
1Claims
0Family size

Assignee

Inventor

Key dates

Filing dateSep 20, 1993
Grant dateFeb 21, 1995
Priority date
Expiry dateSep 20, 2013

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG06F9/45504
  • WIPO fieldComputer technology
  • WIPO sectorElectrical engineering

Abstract

An instruction mapping system comprises an instruction mapping circuit, a central processing unit (CPU), a data cache, and a memory. The address outputs of the CPU are coupled to a first address bus, while the address inputs of the data cache and memory are coupled to a second address bus. The instruction mapping circuit's address inputs are coupled to the first address bus, and the instruction mapping circuit's outputs are coupled to the second address bus. The CPU sends a pointer address via the first address bus to the instruction mapping circuit. The instruction mapping circuit determines whether the pointer address indicates that the next source instruction is within the subset of most frequently executed source instructions. If so, the instruction mapping circuit maps the pointer address to an address within the data cache. If not, the pointer address is routed through the instruction mapping circuit unchanged. The pointer address is next routed to the data cache and to the RAM via the second address bus. If the pointer address was mapped to a data cache address, the data cache outputs the pointer to the next emulation routine on the data bus. If the pointer address was not m…

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.