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Power Management
C.1 Overview
Power-down mode is intended to support Energy Star compliance for
UltraSPARC based systems. Energy Star specifies a system power dissipation of
30 watts in the standby mode. To support this, the goal is one-half watt for the
UltraSPARC CPU and one-half watt for the remainder of the module when in the
power-down mode.
C.2 Power-Down Mode
UltraSPARC does not respond to coherency transactions, interrupt vectors or
slave reads when in power-down mode. Before entering power-down mode the
E-Cache must be flushed to memory by software. This flush should be done by
displacement flush if other masters are doing coherent accesses while the flush is
being performed. Cache flushing is described in Section 5.2, "Cache Flushing," on
page 27.
The system must ensure that no interrupt vectors or slave reads are sent to the
processor once the shutdown sequence begins, because they may not be serviced.
Power-down mode is entered when software executes the privileged SHUT-
DOWN instruction. For a detailed description of the SHUTDOWN instruction,
see Section 13.2, "SHUTDOWN," on page 195. The external clock is left running
while the shutdown is being processed.
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C
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