NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
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Revision V1.30
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USB Host Controller (USBH)
5.23
5.23.1 Overview
The Universal Serial Bus (USB) is a fast, bi-directional, isochronous, low-cost, dynamically attachable
serial interface standard intended for modem, scanners, PDAs, keyboards, mice, and digital imaging
devices. The USB is a 4-wire serial cable bus that supports serial data exchange between a Host
Controller and a network of peripheral devices. The attached peripherals share USB bandwidth
through a host-scheduled, token-based protocol. Peripherals may be attached, configured, used, and
detached, while the host and other peripherals continue operation (i.e. hot plug and unplug is
supported).
5.23.2 Features
Fully compliant with USB Revision 2.0 specification.
Enhanced Host Controller Interface (EHCI) Revision 1.0 compatible.
Open Host Controller Interface (OHCI) Revision 1.0 compatible.
Supports high-speed (480Mbps), full-speed (12Mbps) and low-speed (1.5Mbps) USB
devices.
Supports Control, Bulk, Interrupt, Isochronous and Split transfers.
Integrated a port routing logic to route full/low speed device to OHCI controller.
Built-in DMA for real-time data transfer.