Labels:box | bulletin board | plant | reckoner | shelf | sky OCR: Momon Prefetch queue (empty) 21000 dec (empty) While this instruction 21001 pop (empty) executes in the 1002 push (empty Execution Unit. 21003 push 21004 push 21005 lodsb 21006 ine ..the Bus Inter face Unit 1007 stosb reads as many the 21008 pop next instruction bytes possible into the prefetch quoue Memory Prefetch queue push 21000 dec push 21001 pop lodsb When comes time 21002 push inc for this instruction 1003 push execute 21004 push 21005 lodsh 21006 inc ..the instruction byte 21007 stosh already in the prefetch 21008 pop enenb pue can be sent o the Execution Unit immediately no -cycle memor access neodod to fetch the instruction byte FIGURE 12.4 While the execution unit executes an instruction the bus interface unit prefetches up to of the instruction bytes immediately following the c ...
(.png)
