Instruction prefetching circuit with a next physical address precalculating circuit

摘要

After a logical page number is stored, upon execution of a branch instruction, into a logical page number section in an effective address register, an address converting buffer is retrieved in accordance with a value obtained by addition of "1" to a logical page number of an instruction being executed at present, and a physical page number for a page-over is stored into a page-over address register. Thereafter, when a page-over occurs, the output of the page-over address register is selected by a physical page number selecting circuit and stored into the physical page number section in the instruction address register.