Electrical computers and digital processing systems: memory – Address formation – Address mapping
Patent
1997-04-08
1998-07-28
Chan, Eddie P.
Electrical computers and digital processing systems: memory
Address formation
Address mapping
711152, 711163, 711202, 711205, G06F 1200
Patent
active
057874930
ABSTRACT:
With the present invention, the page table of the program code non-continuously placed in an external storage device using randomly accessible and rewritable memory is built into an executable sequence in a virtual address space of the CPU according to the execution order. By referring to the address translation tables, including the page table, the system is able to read the program from the external storage device, thereby executing the program. Therefore, the program can be executed without being loaded into main memory. Furthermore, the program and data can be managed without distinction.
Further, with the randomly accessible memory according to the present invention, since a sequence of real addresses of the CPU are assigned to the data area, control over the direct execution of the program can be simply achieved. Furthermore, since data and ECC parity can also be read and written sequentially, the system has good compatibility with a hard disk system. Since the data and Ecc parity are present on the same word line and can be accessed without changing the page address, simple control is achieved.
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"Software interface opens door for memory card applications" Computer Design v29 n13 p50, Jul. 01, 1990.
"Chips: Fujitsu in production with memory card controller IC' circuit ofers single-chip solutions" EDGE: Work-Group Computing Report v2 n71 p34, Sep. 30, 1991.
Niijima Hideto
Satoh Akashi
Chan Eddie P.
International Business Machines - Corporation
Nguyen T. V.
Sullivan Robert M.
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