FireLink USB
82C862
912-2000-030
Page 1
Revision: 1.0
®
1.0
Features
• Compliant with USB rev. 1.1 specification
• Fully compatible with USB OHCI specification
• Two independent host controllers, two ports each,
making FireLink USB a multi-function PCI device
• Second host controller can be disabled if not used
• Clock input can be derived from either a 12MHz crystal
or a 48MHz oscillator
• Clocks can be turned off when not in use to save power
• Core operates at 3.3V; PCI inputs are 5V-tolerant
• Incorporates PCI Power Management, supporting very
low power standby modes
• Implements CLKRUN# pin to support hardware-
enforced power-down
• Packaged as 100-pin LQFP (Low-profile Quad Flat
Pack)
• Supported by Windows 98, Windows 2000, and
Windows CE
2.0
Overview
This document describes the OPTi FireLink USB (82C862)
controller.
This PCI-to-USB bridge is unique in that it consists of two
independent dual-port controllers, each sharing only the
common PCI bus connection. This arrangement allows for
a total Universal Serial Bus bandwidth of 24Mb/s, divided
into 12Mb/s for each pair of ports.
Figure 1 provides a block diagram of the overall
functionality of the chip.
Figure 1.
82C862 FireLink USB Block Diagram
port 2
12 MHz
xtal
USB
Con tro ller
M odu le 1
FireLink
FireLink USB
82C862
PC I
in terface
48 MHz Clock
Genera tion
Cen tra l
Arbiter
USB Con fig
Re gs Function 0
USB
Con tro ller
M odu le 2
USB Con fig
Re gs Function 1
port 1
port 4
port 3
REQ #, GNT#
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