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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. Consequently, the USB Implementers Forum (USB-IF) insisted [when?] on a public specification for EHCI.
The xHCI reduces the need for periodic device polling by allowing a USB 3.0 or later device to notify the host controller when it has data available to read, and moves the management of polling USB 2.0 and 1.1 devices that use interrupt transactions from the CPU-driven USB driver to the USB host controller. EHCI, OHCI, and UHCI host controllers ...
Host Controller Interface (USB), an interface that enables a USB host controller to communicate with a driver; Host Controller Interface (Bluetooth) in Bluetooth protocols; Host Controller Interface (non-volatile memory), an interface that enables SATA Express / NVM Express SSDs to communicate with a driver
As an example, assume the case of Wake-on-LAN. Traditionally, the OS controls Wake-on-LAN and must call third-party device drivers to enable support on a network card. With the HECI bus, the host is able to assert its request line (REQ#), the ME will assert its grant line (GNT#), and the host can send its message using its serial transmit signal.
One Extensible Host Controller Interface (xHCI) controller and two Enhanced Host Controller Interface (EHCI) controllers are integrated into the X99 chipset, providing a total of up to 14 USB ports. Out of those ports, up to six can be configured as USB 3.0 ports with speeds of up to 5 Gbit/s per port, while the remaining are USB 2.0 ports with ...
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.
Bogus USB ports will be detected by mobile PCH equipped with 6 USB ports (HM55) on the first EHCI controller. This can happen when AC power and battery are removed after entering ACPI S4. Applying AC power or battery back and resuming from S4 may result in non detected or even non functioning USB device (erratum 13)
The Advanced Host Controller Interface (AHCI) is a technical standard defined by Intel that specifies the register-level interface of Serial ATA (SATA) host controllers in a non-implementation-specific manner in its motherboard chipsets.