Overview
Both ICH (82801AA) and ICH0 (82801AB) provide extensive I/O support. The 82801AA (ICH) / 82801AB (ICH0) functions and capabilities include:
• PCI Rev 2.2 compliant with support for 33 MHz PCI operations.
• PCI slots:
   ICH0 Supports up to 4 Req/Gnt pairs;
   ICH supports up to 6 Req/Gnt pairs
• ACPI Power Management Logic Support
• Enhanced DMA Controller, Interrupt Controller and Timer Functions
• Integrated IDE controller support.
• USB host interface with support for 2 USB ports
• System Management Bus (SMBus) with additional support for I2C devices
• AC’97 2.1 Compliant Link for Audio and Telephony CODECs
• Low Pin Count (LPC) interface
• Firmware Hub (FWH) interface support:.
   :ICH0 supports Ultra ATA/33
   ICH supports Ultra ATA/66)
• Alert On LAN* (82801AA ICH only)