Advance Data Sheet, Rev. 9
June 2001
USS-344 QuadraBus™
Four-Host PCI-to-USB OpenHCI Host Controller
Features
Description
I 32-bit, 33 MHz PCI interface compliant with PCI Local
The Agere Systems Inc. USS-344 QuadraBus provides
a single-chip four-host PCI-to-Universal Serial Bus
(USB) solution. The USS-344 interfaces directly to any
32-bit, 33 MHz PCI bus and is ideal for either onboard
applications or add-in card applications. It can easily be
configured to communicate in either a 3 V PCI environ-
ment or 5 V PCI environment simply by selecting the
appropriate communications voltage level on the VIO
input pin.
The USS-344 provides four downstream USB ports for
connectivity with any USB compliant device or hub. Full-
speed or low-speed peripherals are supported along
with all of the USB transfer types: control, interrupt,
bulk, or isochronous. The USS-344’s OpenHCI compli-
ance offers significant USB performance benefits and
reduced CPU overhead compared to other USB UHCI
host controllers.
In addition, the USS-344 offers a significant perfor-
mance advantage over all other USB host controllers
(both UHCI and OHCI) by providing full USB bandwidth
to each port rather than sharing the USB bandwidth
over all ports. This results in an increase in the number
of devices which can feasibly be connected to a
computer system as well as ensuring high-bandwidth
devices, such as video cameras and audio devices, are
always provided with the high bandwidth they need
while other USB devices are in use.
The USS-344 is a multifunction PCI device with one
single-port USB host controller per PCI function. There
are four PCI functions in the USS-344 for a total of four
single-port USB host controllers. Each single-port host
controller provides the full USB bandwidth (12 Mbits/s)
for devices connected downstream of its port.
Bus Specification Revision 2.2
I Four downstream USB ports
I Each USB port dedicated to providing full USB band-
width to the attached device
I Full compliance with Universal Serial Bus Specifica-
tion Revision 1.1
I OpenHCI Open Host Controller Interface Specifica-
tion for USB Release 1.0a compatible
I Fully compatible with Microsoft Windows 98/95/Win-
dows NT *standard OpenHCI drivers
I Fully compatible with Mac† OS 8.5 and 8.6
I Integrated dual-speed USB transceivers
I 3 V or 5 V switchable PCI signaling
I Low-power mode and wake-up compatible with PCI
Power Management Interface Specification Revision
1.1
I Supports up to 127 devices per port
I Supports peripheral hot swap and wake-up
I Support for legacy keyboard and mouse
I 128-pin TQFP package
I Full 12 Mbits/s bandwidth per port
I Evaluation kit:
— PCI card
— Data sheet
I 0.25 µm technology
Applications
I Seamless integration with 3 V or 5 V PCI-based com-
puter products
I Supports all USB compliant devices and hubs
The USS-344 is fully compatible with the Microsoft
Windows standard OpenHCI drivers. The USS-344
pinout is compatible with the future release of the Agere
USB 2.0 host controller.The USS-344 is a 3.3 V device
fabricated in 0.25 µm technology. Integrated dual-speed
USB transceivers enable a single-chip PCI-to-USB
solution. The USS-344 provides full support for legacy
PC peripherals as defined in the OpenHCI Open Host
Controller Interface Specification for USB Release 1.0a.
I Simultaneous operation of multiple high-performance
devices
* Microsoft, Windows, and Windows NT are registered trademarks
of Microsoft Corporation.
†Mac is a registered trademark of Apple Computer, Inc.
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