Description:

The 82371FB (PIIX) PCI ISA IDE Xcelerator is a multi-function PCI device implementing a PCI-to-ISA bridge function and an PCI IDE function. As a PCI-to-ISA bridge, the PIIX 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 supports two IDE connectors for up to four IDE devices providing an interface for IDE hard disks and CD ROMs. The PIIX provides motherboard plug and play compatibility. PIIX implements two steerable DMA channels (including type F transfers) and up to two steerable interrupt lines. The interrupt lines can be routed to any of the available ISA interrupts. PIIX also implements a programmable chip select.

Features:

• Bridge Between the PCI Bus and ISA Bus
• PCI and ISA Master/Slave Interface
  • PCI from 25–33 MHz
  • ISA from 7.5–8.33 MHz
  • 5 ISA Slots
  • Fast IDE Interface
  • Supports PIO and Bus Master IDE
  • Supports up to Mode 4 Timings
  • Transfer Rates to 22 MB/Sec
  • 8 x 32-Bit Buffer for Bus Master IDE PCI Burst Transfers
• Plug-n-Play Port for Motherboard Devices
  • 2 Steerable DMA Channels
  • Fast DMA with 4-Byte Buffer
  • 1 Programmable Chip Select
• Steerable PCI Interrupts for PCI Device Plug-n-Play
• Functionality of One 82C54 Timer
  • System Timer; Refresh Request; Speaker Tone Output
• Two 82C59 Interrupt Controller Functions
  • 14 Interrupts Supported
  • Independently Programmable for Edge/Level Sensitivity
• Enhanced DMA Functions
  • Two 8237 DMA Controllers
  • Fast Type F DMA
  • Compatible DMA Transfers
  • 7 Independently Programmable Channels
• X-Bus Peripheral Support
  • Chip Select Decode
  • Controls Lower X-Bus Data Byte Transceiver
• System Power Management (Intel SMM Support)
  • Programmable System Management Interrupt (SMI)—Hardware Events, Software Events, EXTSMI#
  • Programmable CPU Clock Control (STPCLK#)
  • Fast On/Off Mode
• Non-Maskable Interrupts (NMI)
  • PCI System Error Reporting
• NAND Tree for Board-Level ATE Testing
• 208-Pin QFP