Description
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 environment or 5 V PCI environment simply by selecting the appropriate communications voltage level on the VIO input pin.

Features
■ 32-bit, 33 MHz PCI interface compliant with PCI Local Bus Specification Revision 2.2
■ Four downstream USB ports
■ Each USB port dedicated to providing full USB bandwidth to the attached device
■ Full compliance with Universal Serial Bus Specification Revision 1.1
■ OpenHCI Open Host Controller Interface Specification for USB Release 1.0a compatible
■ Fully compatible with Microsoft Windows 98/95/Windows NT * standard OpenHCI drivers
■ Fully compatible with Mac† OS 8.5 and 8.6
■ Integrated dual-speed USB transceivers
■ 3 V or 5 V switchable PCI signaling
■ Low-power mode and wake-up compatible with PCI Power Management Interface Specification Revision 1.1
■ Supports up to 127 devices per port
■ Supports peripheral hot swap and wake-up
■ Support for legacy keyboard and mouse
■ 128-pin TQFP package
■ Full 12 Mbits/s bandwidth per port
■ Evaluation kit:
    — PCI card
    — Data sheet
■ 0.25 µm technology

Applications
■ Seamless integration with 3 V or 5 V PCI-based computer products
■ Supports all USB compliant devices and hubs
■ Simultaneous operation of multiple high-performance devices