The ICH is a highly integrated multifunctional I/O Controller Hub that provides the interface to the

　　PCI Bus and integrates many of the functions needed in today’s PC platforms. The ICH

　　communicates with the host controller over a dedicated hub interface. There are two versions of the

　　ICH （82801AA： ICH and 82801AB： ICH0）。 This provides added flexibility in designing costeffective system solutions. These devices are pin compatible and are in 241-pin packages.

　　This datasheet describes the 82801AA （ICH） and 82801AB （ICH0） components. Unless otherwise

　　specified， all non-shaded areas describe the functionality of both components. In the non-shaded

　　areas， the term I/O Controller Hub （ICH） refers to both the 82801AB and 82801AA products.

　　Shading， as is shown here， indicates differences between the two components. In the shaded areas

　　ICH refers to the 82801AA and ICH0 refers to the 82801AB.