G - Physics – 06 – F
Patent
G - Physics
06
F
354/230.87
G06F 9/38 (2006.01) G06F 9/318 (2006.01) G06F 9/355 (2006.01) G06F 12/02 (2006.01)
Patent
CA 1260618
PREFETCH CIRCUIT AND ASSOCIATED METHOD FOR OPERATION WITH A VIRTUAL COMMAND EMULATOR Abstract of the Disclosure A prefetch circuit for use with a memory including a storage register for receiving a command from the memory, a decoding circuit for decoding the command to determine the identification of an index register contained within the command, and a fetch circuit for fetching the contents of the index register from the command. The prefetch circuit also includes a virtual address storage register for receiving and storing the virtual address of the command, an adding circuit for adding a predetermined offset to the virtual address of the command to obtain a new virtual address, a comparison circuit for determining if the new virtual address from the adding circuit has crossed a virtual page boundary, a transfer circuit responsive to the comparison circuit for transferring the real address in the real address storage register to the adding circuit for adding the offset thereto, thereby obtaining a new real address. The fetch circuit then fetches a prefetched command from the memory at the new real address. Data registers are also included for prefetching data.
513092
Chan Kasun K.
Nguyen Truc D.y.
Patel Chiman R.
Ncr Corporation
Smart & Biggar
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