User guide

PH440 NLX Motherboard User Guide September 1998
MITSUBISHI ELECTRIC MOTHERBOARD DIVISION PAGE 19 OF 51
4 ELECTRONICS
PROCESSOR
The PH440 NLX motherboard accepts the following Pentium II
®
processors operating at a bus
speed of 100MHz.
Processor Speed
(MHz)
Core/bus ratio Bus speed MHz
350 3.5 100
400 4.0 100
450 4.5 100
The processor core voltages are generated by switched-mode regulators on the motherboard to
the Intel VRM8.2 specification. The design meets the 100MHz Slot 1 flexible motherboard
recommendations and supports boxed products (processors), including a CPU fan supply.
CORE LOGIC
The core logic is based around the Intel 440BX PCI AGP Controller (PAC) and the PIIX4e
multi-function ISA bridge. The features of each are summarised below.
440BX Host bridge
♦
Slot1 host bridge
♦
DRAM controller supporting SDRAM main memory with optional ECC
♦
PCI 2.1 compliant
♦
AGP compliant target
♦
Virtual PCI to PCI bridge to support AGP bus
♦
Packaged in a 492 Pin BGA
PIIX4e Multifunction ISA Bridge
♦
PCI to ISA bridge
♦
Dual UltraDMA33 IDE controller
♦
ISA system peripherals (timers, DMA etc.)
♦
Dual USB controller (12Mbps or 1.5Mbps)
♦
SMbus controller (motherboard management)
♦
Real-time clock
♦
ACPI power management logic
♦
Packaged in a 324 pin BGA
The two IDE interfaces are completely independent and can operate concurrently. Both can also
be configured as a PCI bus master.