PCIUSB
PCIUSB is a term used to describe USB host controller hardware that resides on a PCI bus within a computer system. In this usage, a PCIUSB device provides the USB host interface to the rest of the system, allowing the CPU to manage USB ports and connected devices through the PCI infrastructure.
A PCIUSB controller exposes its configuration through the PCI configuration space and uses PCI memory-mapped I/O
Historically, PCI-based USB controllers implemented the USB 1.1 UHCI and OHCI standards, later adopting USB 2.0's
Operating systems include drivers for standard USB host controllers that recognize these devices, enabling automatic device
Today, PCIUSB is largely a historical or legacy term, with modern USB host controllers typically implemented