Audio; Ieee 1394 Bus; Usb - Sun Microsystems Sun Blade 1000 Service Manual

C.6.1.4

Audio

The audio module is put into a stand-by mode by software when it is inactive. When
an application accesses the audio subsystem, the audio module reactivates.
C.6.1.5

IEEE 1394 Bus

When software determines there is no activity on the IEEE 1394 bus and there is no
need to provide power to any external devices, the power provided by the system to
the cable is turned off. The PHY is still on so that it acts as a repeater although the
Sun Blade 1000 and Sun Blade 2000 workstations are logically off the IEEE 1394 bus.
This would allow external devices to still communicate on the bus while the Sun
Blade 1000 and Sun Blade 2000 workstations are in low-power mode.
The IEEE 1394 interface must be awakened by software when an application desires
to use the IEEE 1394 bus.
C.6.1.6

USB

USB framework power, manages all USB devices. If a USB device is inactive for a
period of time, USB framework puts the device into low-power mode. The device is
again brought into full power mode by the USB framework when a user attempts to
use a device or when an application on the host starts an input or output to or from
the device. All HID (human interface device) hub and storage devices (example:
keyboard or mouse) are power managed by default if they support wakeup. Printers
are power managed only between job outputs.
Note – Activity on the USB keyboard or mouse indicates user intervention, causing
USB framework power to remove the workstation from low-power mode.
Appendix C Functional Description C-53