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Advanced/RH Technical Product Specification •• Page 10
EXPANSION RISER
An expansion slot riser connector of EISA form factor provides the capability to support either two or three PCI
slots by changing a motherboard jumper to route any extra IRQ and ID selects. A riser board can also support up
to five ISA expansion slots. The PCI bus is compliant with the PCI 2.1 specification.
To ensure that the lowest positioned slot on the riser card can support a full length add-in card the following
conditions must be met.
1) The minimum height requirement for the lowest positioned slot on the CPU side of the riser is 1.2”. Therefore
the CPU heat sink should be no more than 1.2” high once installed on the processor.
2) The minimum height requirement for the lowest positioned slot on the SIMM side of the riser is 1.3”.
Therefore, once SIMM memory is installed they should not be taller than 1.3”.
PERIPHERAL COMPONENT INTERCONNECT (PCI) PCISET
The Intel 82430HX PCIset is made up of two components: The 82439HX controller (TXC) and the 82371SB
PCI ISA IDE Xcellerator (PIIX3) ISA bridge. The PCIset provides the following functions:
• CPU interface control
• Integrated L2 write-back cache controller
– Pipeline Burst SRAM
– 256 KB or 512 KB Direct Mapped
• Integrated DRAM controller
– 64/72-bit path to Memory
– Support for EDO and Fast Page DRAM
– 8 MB to 512 MB main memory
– Parity and ECC support
• Fully synchronous PCI bus interface
– 25/30/33 MHz
– PCI to DRAM > 100 Mbytes/sec
• Interface between the PCI bus and ISA bus
• Universal Serial Bus Controller
(with B0 stepping of the PIIX 3)
– Host/Hub Controller
– Two USB ports
• Integrated fast IDE interface
– Support for up to 4 devices
– PIO Mode 4 transfers up to 16 MB/sec
– Integrated 8 x 32-bit buffer for Bus
Master PCI IDE burst transfers
– Bus Master mode
• PCI 2.1 Compliant
• Enhanced Fast DMA controller
• Interrupt controller and steering
• Counters/Timers
• SMI interrupt logic and timer with Fast On/Off mode
82439HX TXC
The 439HX controller provides all control signals necessary to drive a second level cache and the DRAM array,
including multiplexed address signals. It also controls system access to memory and generates snoop controls to
maintain cache coherency. The 439HX controller comes in a 324 pin Ball Grid Array package.
82371SB PCI ISA IDE XCELERATOR (PIIX3)
The PIIX3 provides the interface between the PCI and ISA buses and integrates a dual channel fast IDE interface
capable of supporting up to 4 devices. USB host/hub bus is provided by the PIIX 3. The PIIX3 integrates seven
32-bit DMA channels, five 16-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 onto the same
device. The PIIX3 comes in a 208 pin QFP package.