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Support for isochronous and asynchronous transfer types over the same set of wires
Guaranteed bandwidth and low latencies appropriate for telephony, audio, and other
applications
Error-handling and fault-recovery mechanisms built into the protocol
!
NOTE
Computer systems that have an unshielded cable attached to a USB port may not meet FCC Class B
requirements, even if no device or a low-speed USB device is attached to the cable. Use shielded cable that
meets the requirements for full-speed devices.
3.9 I/O Controller
The FDC37B782 I/O controller from SMSC is an ISA Plug and Play-compatible, multifunctional
I/O device that provides the following features:
One serial port
FIFO support on both serial and diskette drive interfaces
PS/2-style mouse and keyboard interfaces
Support for serial IRQ packet protocol
Intelligent power management, including:
Shadowed write-only registers for ACPI compliance
Programmable wake up event interface
3.9.1 Serial Port
The motherboard supports one serial port via 9-pin D-Sub connector. The populated serial port is
located on the back panel. The serial port is NS16C550-compatible UARTs and support data
transfers at speeds up to 460 Kbits/sec with BIOS support. Additionally, this port supports the
Wake On Ring functionality.
3.9.2 Diskette Drive Controller
The I/O controller supports a single diskette drive that is compatible with the 82077 diskette drive
controller and support both PC-AT
floppy drive interface connector.
3.9.3 Keyboard and Mouse Interface
The PS/2 keyboard and mouse connectors are located on the back panel. The +5V lines to these
connectors are protected with a PolySwitch † circuit that, like a self-healing fuse, reestablishes the
connection after an overcurrent condition is removed.
!
NOTE
The mouse and keyboard can be plugged into either of the PS/2 connectors. Turn off power to
the computer before connecting or disconnecting a keyboard or mouse.
3.9.4 Real-Time Clock, CMOS SRAM, and Battery
The real-time clock is provided by the SMC FDC37B782 Super I/O chip and is compatible with
DS1287 and MC146818 components. The clock provides a time-of-day clock and a multicentury
Intel ® SRMK2 Internet Server Technical Product Specification
†
and PS/2 modes. The baseboard supports only a slimline
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