Introduction
18
Power supply
As with all computer products, a stable power source is necessary for proper and reliable
operation. It is even more important for processors that have high CPU clock rates.
The SB5520DT1 can accommodate 24-pin ATX power supplies. Although many power supplies
generally meet the specifications required by the CPU, some are inadequate. In addition, the
two 12V 8-pin power connections are also required to ensure adequate power supply to the
system. Also your power supply must supply 1.5A for the Ethernet ports.
W
ARNING! To prevent damage to the power supply or motherboard, use a power supply
that contains a 24-pin and two 8-pin power connectors. Be sure to connect these
connectors to the 24-pin (JPW1) and the two 8-pin (JPW2 and JPW3) power connectors
on the motherboard for adequate power supply to your system. Failure to do so will void
the manufacturer’s warranty on your power supply and motherboard.
It is strongly recommended that you use a high quality power supply that meets ATX power
supply Specification 2.02 or above. It must also be SSI compliant (for more information, refer to
the Web site at http://www.ssiforum.org). Additionally, in areas where noisy power transmission
is present, you may choose to install a line filter to shield the computer from noise. It is
recommended that you also install a power surge protector to help avoid problems caused by
power surges.
Super I/O
The Super I/O provides two high-speed, 16550 compatible serial communication ports
(UARTs). Each UART includes a 16-byte send/receive FIFO, a programmable baud rate
generator, complete modem control capability and a processor interrupt system. Both UARTs
provide legacy speed with baud rate of up to 115.2 Kbps as well as an advanced speed with
baud rates of 250 K, 500 K, or 1 Mb/s, which support higher speed modems.
The Super I/O provides functions that comply with ACPI (Advanced Configuration and Power
Interface), which includes support of legacy and ACPI power management through an SMI or
SCI function pin. It also features auto power management to reduce power consumption.
Overview of the Nuvoton WPCM450 controller
The Nuvoton WPCM450 controller is a baseboard management controller (BMC) that supports
the 2D/VGA-compatible graphics core with the PCI interface, virtual media, and keyboard, video,
and mouse redirection (KVMR) modules. With blade-oriented Super I/O capability built in, the
WPCM450 BMC is ideal for legacy-reduced server platforms.
The BMC interfaces with the host system through a PCI interface to communicate with the
graphics core. It supports USB 2.0 and 1.1 for remote keyboard/mouse/virtual-media
emulation. It also provides LPC interface to control Super I/O functions. The BMC is connected
to the network through an external Ethernet PHY module.
The BMC communicates with onboard components using six SMBus interfaces, fan control, and
Platform Environment Control Interface (PECI).
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