HP Workstation x2000 hp workstation x2000 - Technical Reference and Troublesho - Page 56
ICH2 Features
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System Board The Input/Output Controller Hub 2 (82801BA) Feature • Timers based on 82C54: - System timer, refresh request, speaker tone output • System timer, refresh request, speaker tone output • FWH interface • 241 BGA package Feature • SMBus - Host interface allows processor to communicate via SMBus - Compatible with two-wire I2C bus • GPIO: - TTL, Open-Drain, Inversion • 3.3V operation with 5V tolerant buffers for IDE and PCI signals • Alert-On-LAN (AOL) support ICH2 Features ICH2 Architecture The ICH2 interface architecture ensures that the I/O subsystems, both PCI and the integrated I/O features (for example, IDE, AC'97, and USB), receive adequate bandwidths. By placing the I/O bridge directly on the ICH2 interface, and no longer on the PCI bus, the ICH2 architecture ensures that the I/O functions obtain the bandwidth necessary for peak performance. 56 Chapter 2