Sun Microsystems UltraSPARC-I User Manual page 30

The physical address of a store is sent to the Store Buffer during this stage. To
avoid pipeline stalls when store data is not immediately available, the store ad-
dress and data parts are decoupled and sent to the Store Buffer separately.
F -
LOATING POINT AND GRAPHICS UNIT
ues for most operations.
2.2.7 Stage 7: N Stage
2
Most floating-point instructions finish their execution during this stage. After N
data can be bypassed to other stages or forwarded to the data portion of the Store
Buffer. All loads that have entered the Load Buffer in N
through the buffer; they will reappear in the pipeline only when the data comes
back. Normal dependency checking is performed on all loads, including those in
the load buffer.
F -
LOATING POINT AND GRAPHICS UNIT
2.2.8 Stage 8: N Stage
3
UltraSPARC resolves traps at this stage.
2.2.9 Stage 9: Write (W) Stage
All results are written to the register files (integer and floating-point) during this
stage. All actions performed during this stage are irreversible. After this stage, in-
structions are considered terminated.
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: The X stage of the FGU. Execution contin-
2
continue their progress
1
: The X stage of the FGU.
3
2. Processor Pipeline
,
2
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