82371Ab Pci Isa Ide Xcelerator (Piix4) - Intel AN430TX - Motherboard - ATX Technical Product Specification

Integrated DRAM controller
8 MB to 256 MB main memory
64-Mbit DRAM/SDRAM technology support
3.3V EDO and unbuffered synchronous DRAM support
Non-parity (x64) support only
Fully synchronous minimum latency PCI bus interface
PCI compliance (see Section 5.1 for compliance level)
30 and 33 MHz bus speeds
PCI to DRAM data throughput at greater than 100 MB/sec
Up to four PCI masters in addition to the PIIX4
Power management control
Provides PCI CLKRUN# signal to control memory clock on the PCI bus (on/off)
Internal clock control (gated off if no host or PCI bus activity)

1.7.2 82371AB PCI ISA IDE Xcelerator (PIIX4)

The Intel 82371AB PCI ISA IDE Xcelerator (PIIX4) is a multifunction PCI device implementing a
PCI to ISA bridge, PCI IDE functionality, a Universal Serial Bus (USB) host/hub function, and
Enhanced Power Management. The PIIX4 comes in a 324-pin MBGA package that features:
Multifunction PCI to ISA bridge
Supports the PCI bus at 30 and 33 MHz
PCI compliant (see section 5.1 for compliance level)
Full ISA or extended I/O (EIO) bus support
USB controller
Two USB ports (see section 5.1 for compliance level)
Supports legacy keyboard and mouse
Supports UHCI design guide revision 1.1 interface
Integrated dual-channel enhanced IDE interface
Support for up to four IDE devices
PIO Mode 4 transfers at up to 14 MB/sec
Supports "Ultra DMA/33" synchronous DMA mode transfers up to 33 MB/sec
Integrated 8 x 32-bit buffer for bus master PCI IDE burst transfers
Bus master mode
Enhanced DMA controller
Two 8237-based DMA controllers
Supports PCI DMA with three PC/PCI channels and distributed DMA protocols
Fast type-F DMA for reduced PCI bus usage
Interrupt controller based on 82C59
Support for 15 interrupts
Programmable for edge/level sensitivity
Power management logic
Sleep/resume logic
Supports thermal alarm
Support for wake on modem through Ring Indicate input
Motherboard Description
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