Dispatch and Execution Timing 4-7
18524C/0—Nov1996 AMD-K5 Processor Technical Reference Manual
The x/y value following the ROP type indicates the relative dis-
patch and execution cycle of the opcode, in the absence of any
conflicts. The format is:
x/y[/z]
where:
■ x=Dispatch Cycle—The relative cycle in which the ROP is
dispatched from decode to the reservation station.
■ y=Execution Cycle—The relative cycle in which the ROP is
issued from the reservation station to the execution unit.
■ z=Result Cycle—The relative cycle in which the result is
returned on the result bus. It is indicated only when the
latency is greater than one cycle. For stores, it reflects the
relative time that a store operand is available to be for-
warded from the store buffer to a dependent load opera-
tion.
Using the time that the first ROP of an instruction is dis-
patched to an execution unit as clock 1, the x/y value indicates
in which clock each ROP is dispatched and executed relative to
clock 1. The execution order and timing does not necessarily
match the dispatch order and timing.
If any of the instructions read from or write to memory, it is
assumed that the data exists in the cache.
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