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Motherboard Description
13
• Integrated DRAM controller
64/72-bit Non-Interleaved path to memory w/ ECC support
Support for EDO and Fast Page DRAM
8 MB to 256 MB main memory
• Fully synchronous PCI bus interface
PCI Rev. 2.1 - 5 V interface compliant
25/30/33 MHz
PCI to DRAM > 100 MBps
• Data Buffering
Host-to-DRAM and PCI-to-DRAM write data buffering
Write combining support for host-to-PCI burst writes
1.7.2 82442FX Data Bus Accelerator (DBX)
The DBX connects to the 64 bit Pentium Pro processor data bus, the 64/72 bit memory data bus
and the 16 bit PMC private data bus. The DBX works in parallel with the PMC to provide a high
performance memory subsystem for Pentium Pro processor based computers. The DBX comes in
a 208 pin PQF package.
1.7.3 82371SB PCI/ISA IDE Xccelerator (PIIX3)
The 82371SB provides the interface between the PCI and ISA buses and integrates a dual channel
fast IDE interface capable of supporting up to four devices. The 82371SB integrates four 8-bit and
three 16-bit DMA channels, three 8-bit timer/counters, two eight-channel interrupt controllers,
PCI-to-AT
†
interrupt mapping circuitry, NMI logic, ISA refresh address generation, and PCI/ISA
bus arbitration circuitry together into the same device. The PIIX3 comes in a 208-pin QFP
package and provides the following features:
• Interface between the PCI bus and ISA bus
• Universal Serial Bus (USB)
Host/Hub Controller
Support for 2 USB ports
• Integrated fast IDE interface
Support for up to 4 devices with separate Master/Slave mode support
PIO Mode 4 transfers up to 16 MB/sec
Integrated 8 x 32-bit buffer for Bus Master IDE PCI burst transfers
• Enhanced DMA controller with Fast Type-F DMA
• Counters/Timers
• Power Management
Programmable system management interrupt (SMI)