Ads
related to: hi-speed usb host controller
Search results
Results from the WOW.Com Content Network
The Enhanced Host Controller Interface (EHCI) [5] is a high-speed controller standard applicable to USB 2.0. UHCI- and OHCI-based systems, as existed previously, entailed greater complexity and costs than necessary.
For example, a USB 2 PCIe host controller card that presents 4 USB "Standard A" connectors typically presents one 4-port EHCI and two 2-port OHCI controllers to system software. When a high-speed USB device is attached to any of the 4 connectors, the device is managed through one of the 4 root hub ports of the EHCI controller.
A special protocol during reset, called chirping, is used to negotiate the high speed mode with a host or hub. A device that is high speed capable first connects as a full speed device (D+ pulled high), but upon receiving a USB RESET (both D+ and D− driven LOW by host for 10 to 20 ms) it pulls the D− line high, known as chirp K.
The Hi-Speed USB logo. USB 2.0 was released in April 2000, adding a higher maximum signaling rate of 480 Mbit/s (maximum theoretical data throughput 53 MByte/s [25]) named High Speed or High Bandwidth, in addition to the USB 1.x Full Speed signaling rate of 12 Mbit/s (maximum theoretical data throughput 1.2 MByte/s). [26]
USB high speed host controller based on EHCI (a register interface) Full/low speed host controller based on OHCI (another register interface) USB device controller, supporting both high and full speeds; Fourth controller to switch the OTG root port between host and device controllers; Also, most gadgets must be either a host or a device.
USB 3.0 SuperSpeed and USB 2.0 High-Speed versions defined USB 3.0 SuperSpeed – host controller (xHCI) hardware support, no software overhead for out-of-order commands; USB 2.0 High-speed – enables command queuing in USB 2.0 drives; Streams were added to the USB 3.0 SuperSpeed protocol for supporting UAS out-of-order completions
USB High Speed : 480 Mbit/s, USB SuperSpeed: 5 Gbit/s ... SATA is a computer bus interface for connecting host bus ... (1.1); USB 3.0 devices are compatible, but will ...
IEEE 1394 is an interface standard for a serial bus for high-speed communications and isochronous real-time data transfer. It was developed in the late 1980s and early 1990s by Apple in cooperation with a number of companies, primarily Sony and Panasonic.
Ads
related to: hi-speed usb host controller