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Chapter 1: Introduction
In addition to enabling operating system-directed power management, ACPI also provides a
generic system event mechanism for Plug and Play and an operating system-independent
interface for conguration control. ACPI leverages the Plug and Play BIOS data structures
while providing a processor architecture-independent implementation that is compatible with
Windows 8/R2, and Windows 2012/R2 operating systems.
1.6 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. In areas
where noisy power transmission is present, you may choose to install a line lter 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. For the A2SDi-TP8F and A2SDi-16C-TP8F
motherboard, please use a power supply that supports 2.5A or above on 5V standby.
1.7 Super I/O
The Super I/O (Aspeed AST2400 chip) includes a data separator, write pre-compensation
circuitry, decode logic, data rate selection, a clock generator, drive interface control logic and
interrupt and DMA logic. The wide range of functions integrated onto the Super I/O greatly
reduces the number of components required for interfacing with oppy disk drives.
The Super I/O provides two high-speed, 16550 compatible serial communication ports
(UARTs), one of which supports serial infrared communication. 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 Conguration and Power
Interface), which includes support of legacy and ACPI power management through a SMI
or SCI function pin. It also features auto power management to reduce power consumption.
The IRQs, DMAs and I/O space resources of the Super I/O can be exibly adjusted to meet
ISA PnP requirements, which support ACPI and APM (Advanced Power Management).
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