The 82371AB PCI ISA IDE Xcelerator (PIIX4) is a multi-function PCI device implementing a PCI-to-ISA bridge function, a PCI IDE function, a Universal Serial Bus host/hub function, and an Enhanced Power Management function. As a PCI-to-ISA bridge, PIIX4 integrates many common I/O functions found in ISA-based PC systemstwo 82C37 DMA Controllers, two 82C59 Interrupt Controllers, an 82C54 Timer Counter and a Real Time Clock In addition to compatible transfers, each DMA channel supports Type F transfers. PIIX4 also contains full support for both PC PCI and Distributed DMA protocols implementing PCI-based DMA. The Interrupt Controller has Edge or Level sensitive programmable inputs and fully supports the use of an external I/O Advanced Programmable Interrupt Controller (APIC) and Serial Interrupts. Chip select decoding is provided for BIOS, Real Time Clock Keyboard Controller, second external Microcontroller as well as two Programmable Chip Selects. PIIX4 provides full Plug and Play compatibility. PIIX4 CAN be configured as a Subtractive Decode bridge or as a Positive Decode bridge. This allows the use of a subtractive decode PCI-to-PCI bridge such as the Intel 380FB PCIset which implements a PCI ISA docking station environment. By Intel Corporation
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