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82845 MCH for SDR Datasheet 3

Contents

Introduction ........................................................................................................................11

Terminology and Notations ...................................................................................11

Reference Documents ..........................................................................................13

845 Chipset System Architecture ................................................................14

82845 MCH Overview .................................................................................14

System Bus Interface ............................................................................15

System Bus Error Checking ..................................................................15

System Memory Interface .....................................................................16

AGP Interface........................................................................................16

Hub Interface.........................................................................................17

MCH Clocking ..............................................................................17

System Interrupts ..................................................................................18

Powerdown Flow ...................................................................................18

Signal Description..............................................................................................................19

System Bus Signals ..............................................................................................21

SDR SDRAM Interface Signals.............................................................................23

Hub Interface Signals............................................................................................23

AGP Interface Signals...........................................................................................24

AGP Addressing Signals .......................................................................24

AGP Flow Control Signals .....................................................................25

AGP Status Signals ...............................................................................25

AGP Strobes Signals.............................................................................26

AGP/PCI Signals ...................................................................................26

Clocks, Reset, and Miscellaneous Signals ...........................................................28

Voltage Reference and Power Signals .................................................................29

Reset States During Reset ...................................................................................30

Register Description ..........................................................................................................31

Register Terminology............................................................................................31

PCI Bus Configuration Space Access...................................................................32

Standard PCI Bus Configuration Mechanism........................................33

Routing Configuration Accesses ...........................................................33

I/O Mapped Registers ...........................................................................................34

CONF_ADDR—Configuration Address Register ..................................34

CONF_DATA—Configuration Data Register.........................................36

Memory-Mapped Register Space .........................................................................36

DRAMWIDTH—DRAM Width Register.................................................37

DQCMDSTR—Strength Control Register (SDQ and CMD
Signal Groups) ......................................................................................38

CKESTR—Strength Control Register (SCKE Signal Group) ................39

CSBSTR—Strength Control Register (SCS# Signal Group).................40

CKSTR—Strength Control Register (Clock Signal Group) ...................41

RCVENSTR—Strength Control Register (RCVENOUT
Signal Group) ........................................................................................42