Sun-microsystems SPARC T5220 User Manual download pdf (Page 20)

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Power Management

Beyond the inherent efﬁciencies of CMT design, the UltraSPARC T2 is the ﬁrst processor

to incorporate unique power management features at both the core and memory levels

of the processor. These features include reduced instruction rates, parking of idle

threads and cores, and ability to turn off clocks in both cores and memory to reduce

power consumption. Substantial innovation is present in the areas of:

• Limiting speculation such as conditional branches not taken

• Extensive clock gating in the data path, control blocks, and arrays

• Power throttling that allows extra stall cycles to be injected into the decode stage

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Sun-microsystems SPARC T5220 User Manual Page 20