82371SB (PIIX3)

The 82371SB (PIIX3) PCI ISA IDE Xcelerator is a multi-function PCI device 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 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 PIIX3 supports two IDE connectors for up to four IDE devices providing an interface for IDE hard disks and CD ROMs. The 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. PIIX3 also implements a programmable chip select. PIIX3 contains a Universal Serial Bus (USB) Host Controller that is UHCI compatible. The Host Controller’s root hub has two programmable USB ports. PIIX3 also provides support for an external IOAPIC.

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
- Separate Master/Slave IDE Mode Support
Plug-n-Play Port for Motherboard Devices
- 2 Steerable Interrupts Lines on the PIIX and 1 Steerable Interrupt Line
- 1 Programmable Chip Select
Steerable PCI Interrupts for PCI Device Plug-n-Play
PCI Specification Revision 2.1 Compliant
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
I/O Advanced Programmable Interrupt Controller (IOAPIC) Support
Universal Serial Bus (USB) Host Controller
- Compatible with Universal Host Controller Interface (UHCI)
- Contains Root Hub with 2 USB Ports
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