Ehci ohci uhci three PC master USB chip

Source: Internet
Author: User

Ehci ohci uhci they are all host controller specifications,

OHCI is mainly a non-PC system and a USB chip on the PC board with sishe Ali chipset. uhci is mostly a USB controller chip on Intel and via motherboard.

Uhci hardware circuit is simpler than OHCI, the cost is the most, but the drive is complex. However, they are all from the USB specification.

EHCIIt is developed by several vendors such as Intel and is compatible with OHCI uhci.Follow the USB2.0 Specification.

USB specifications are defined at the register level, but each vendor may have its own dedicated registers.


EHCI cannot be driven by uhci and OHCI drivers because it complies with the USB specification.


P35 must use EHCI sis650 must use OHCI; otherwise, USB cannot be loaded in DOS, and ghost XP can also be loaded into PE.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.