Subversion Repositories planix.SVN

units
        branch
        integer
        floating point
on 601
        issue at most one per unit per cycle
        eight entry instruction queue
        can fill queue from cache in one clock cycle
                loads from requested address to end of cache block
pipeline
        prefetch
                includes ins. cache access cycles
        decode
        execute
        writeback

fpu
        IQ[3210] → fpu buffer/decode [≥1 cycle] → execute 1 → execute 2 → writeback
iu
        IQ0/decode → buffer [if exec busy] → execute [hold for dependency] →
                                        circulate in load/store
                                        writeback
bpu
        IQ[3210] → decode/execute → writeback

notes
        address calculation must complete before stored value enters write buffer