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Description as follow:

The NH82801GB is an Intel I/O Controller Hub 7. The ICH7 provides extensive I/O support. The ICH7 NH82801GB incorporates a variety of PCI functions that are divided into six logical devices (B0:D27, B0:D28, B0:D29, B0:D30, B0:D31 and B1:D8). D30 is the DMI-to-PCI bridge and the AC 97 Audio and Modem controller functions, D31contains the PCI-to-LPC bridge, IDE controller, SATA controller, and SMBus controller, D29 contains the four USB UHCI controllers and one USB EHCI controller, and D27 contains the PCI Express root ports. B1:D8 of the NH82801GB is the integrated LAN controller.

Parametrics

NH82801GB absolute maximum ratings: (1)Voltage on any 3.3 V Pin with respect to Ground: -0.5 to Vcc3_3 + 0.5 V; (2)Voltage on any 5 V Tolerant Pin with respect to Ground(V5REF=5 V): -0.5 to V5REF + 0.5 V; (3)1.05 V Supply Voltage with respect to VSS: -0.5 to 2.1 V; (4)1.5 V Supply Voltage with respect to VSS: -0.5 to 2.1 V; (5)3.3 V Supply Voltage with respect to VSS: -0.5 to 4.6 V; (6)5.0 V Supply Voltage with respect to VSS: -0.5 to 5.5 V; (7)V_CPU_IO Supply Voltage with respect to VSS: -0.5 to 2.1 V.

Features

NH82801GB features: (1)PCI Express Base Specification, Revision 1.0a support (Desktop and Mobile Only); (2)PCI Local Bus Specification, Revision 2.3 support for 33 MHz PCI operations; (3)(supports up to six Req/Gnt pairs; three pairs on Ultra Mobile); (4)ACPI Power Management Logic Support; (5)Enhanced DMA controller, interrupt controller, and timer functions (Desktop and Mobile Only); (6)Integrated Serial ATA host controller with independent DMA operation on four ports(Desktop only) or two ports (Mobile Only) and AHCI (ICH7R, ICH7DH, ICH7-M, and ICH7-M DH Only) support. (SATA not supported on Ultra Mobile); (7)Integrated IDE controller supports Ultra ATA100/66/33; (8)USB host interface with support for eight USB ports; four UHCI host controllers; one EHCI high-speed USB 2.0 Host controller; (9)Integrated LAN controller (Desktop and Mobile Only); (10)System Management Bus (SMBus) Specification, Version 2.0 with additional support for I2C devices (Desktop and Mobile Only); (11)Supports Audio Codec 97, Revision 2.3 Specification (a.k.a., AC 97 Component Specification, Revision 2.3) which provides a link for Audio and Telephony codecs(up to 7 channels) (Desktop and Mobile Only); (12)Supports Intel High Definition Audio; (13)Supports Intel Matrix Storage Technology (ICH7R, ICH7DH, and Mobile Only); (14)Supports Intel Active Management Technology (Desktop and Mobile Only); (15)Low Pin Count (LPC) interface; (16)Firmware Hub (FWH) interface support; (17)Serial Peripheral Interface (SPI) support (Desktop and Mobile Only).

Diagrams