Intel 80312 I/O Companion Chip - ECEE

Intel ® 80312 I/O Companion ChipIntroduction1.2 About the Intel ® 80312 I/O Companion ChipThe Intel ® 80312 I/O companion chip is designed to work with the Intel ® 80200 processor toprovide a cost effective solution that addresses the needs for intelligent I/O designs on serveradd-in cards and enable efficient Intelligent I/O solutions on motherboards. See Figure 1-1.Figure 1-1.Intel ® 80200 Processor System Block DiagramSDRAM80200 Processor Data BusIntel® 80200 Processorbased onIntel® XScaleMicroarchitecture80200 Request BusIntel® 80312I/O Companion ChipThe Intel ® 80312 I/O companion chip is a multi-function device that integrates, PCI-to-PCI BridgeUnit, two PCI - Internal Bus Address Translation Units, I 2 O* Messaging Unit, Direct MemoryAccess (DMA) Controller, Integrated Memory Controller, Performance Monitor, ApplicationAccelerator, Secondary PCI Bus Arbitration Unit, and an I 2 C Bus Interface Unit, into a singlesystem.The PCI Bus is an industry standard, high performance, low latency system bus. The PCI-to-PCIBridge provides a connection path between two independent 32-bit or 64-bit PCI buses andprovides the ability to overcome PCI electrical loading limits. Additionally, both PCI busses aredesigned to support the 66 MHz requirements as defined by the PCI Local Bus Specification,Revision 2.2.The Intel ® 80312 I/O companion chip is a multi-function PCI device. The default configuration hasFunction 0 as the PCI-to-PCI Bridge Unit, and Function 1 as the Address Translation Unit. TheIntel ® 80312 I/O companion chip contains PCI configuration space accessible through the primaryPCI bus.1-2 Developer’s Manual