2 System Board

PCI 64-bit Hub

PCI 64-bit Hub

The P64H is a peripheral chip that performs PCI bridging functions between the MCH and the PCI 64-bit 66 MHz bus. The P64H has a 16-bit primary hub interface to the MCH and a secondary 64-bit PCI bus interface. This controller inter-operates transparently with either 64-bit or 32-bit devices.

The following figure shows how the P64H chip is connected to the MCH via the Hub Link 16 and to the supported devices such as those in the two PCI 64-bit 66 MHz PCI slots and AIC-7892 Ultra 160 SCSI controller via the PCI

64-bit 66 MHz bus.

 

 

 

 

 

 

 

 

 

Intel Pentium III

 

 

Intel Pentium III

 

 

 

 

 

 

 

 

 

 

Processor

 

 

Processor

 

 

 

 

 

 

 

 

 

 

(optional second processor)

 

 

with L2 cache memory

 

 

 

 

 

 

SECC-2 cartridge

 

 

 

with L2 cache memory

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Address (36)

Control

Data (64)

I840 Memory

Controller Hub (MCH)

82840-QP

HUB

LINK 16

(533 MB/s data transfer rate)

PCI Bus (64-bit, 66 MHz)

P64H

533 MB/s data transfer rate

PCI

Interface

Onboard AIC7892

SCSI U160 Slot 3 - 64-bit/66 MHz

Controller

Slot 4 - 64-bit/66 MHz

SECC-2 cartridge

Host (also called FSB) two-way Bus 100/ 133 MHz, 1 GB/sec data transfer rate)

44