Intel PIIX Info: PCI ISA IDE Xcelerators
UDMA, Bus Master, Triones Bus Master drivers - Remember those in the early days of Win95? Now we have ATA/100 otherwise known as Ultra DMA - UDMA/100.... ATA/133... Serial ATA...
The 82371FB (PIIX) and 82371SB (PIIX3) PCI ISA IDE Xcelerators are multi-function PCI devices implementing a PCI-to-ISA bridge function and an PCI IDE function. In addition, the PIIX3 implements a Universal Serial Bus host/hub function. As a PCI-to-ISA bridge, the PIIX/PIIX3 integrates many common I/O functions found in ISA-based PC systems.
A seven-channel DMA controller, two 82C59 interrupt controllers, an 8254 timer/counter, and power management support. In addition to compatible transfers, each DMA channel supports type F transfers. Chip select decoding is provided for BIOS, real time clock, and keyboard controller. Edge/Level interrupts and interrupt steering are supported for PCI plug and play compatibility.
The PIIX/PIIX3 supports two IDE connectors for up to four IDE devices providing an interface for IDE hard disks and CD ROMs. The PIIX/PIIX3 provides motherboard plug and play compatibility. PIIX implements two steerable DMA channels (including type F transfers) and up to two steerable interrupt lines. PIIX3 implements one steerable interrupt line. The interrupt lines can be routed to any of the available ISA interrupts. Both PIIX/PIIX3 implement a programmable chip select.
The 82371AB PCI ISA IDE Xcelerator (PIIX4) is a multi-function PCI device implementing a PCI-to-ISA bridge function, a PCI IDE function (Ultra DMA), a Universal Serial Bus host/hub function, and an Enhanced Power Management function (ACPI). As see on the Intel 430TX PCIset (Intel 82371AB PCI Bus Master IDE Controller) & Intel 440BX AGPset were both PIIX4.
Protocol for the ATA/IDE hard disk drive interface that doubles IDE/ATA drives at 16.6 MB/s to the burst data transfer rate of 33 megabytes (MB) per second (ATA/33; UDMA-33). This technology is capable of transferring twice as much data per clock cycle and provides a path for disk drive vendors to scale the performance of their products. A user can potentially benefit from faster disk reads and writes, resulting in less waiting time when starting a system or application. The Ultra DMA protocol is implemented in all new Intel PCIsets (beginning with the 430TX) and disk drive products from all leading vendors.