RG82845M Intel, RG82845M Datasheet - Page 3

• Manufacturer Part Number: RG82845M
• Description: Chipset Memory Controller Hub Mobile
• Manufacturer: Intel

Contents
1.
2.
3.
250687-002
R
Overview .................................................................................................................................... 14
1.1.
1.2.
1.3.
1.4.
1.5.
1.6.
1.7.
Signal Description ...................................................................................................................... 20
2.1.
2.2.
2.3.
2.4.
2.5.
2.6.
2.7.
Register Description................................................................................................................... 36
3.1.
3.2.
3.3.
3.4.
3.5.
3.6.
3.7.
System Architecture ...................................................................................................... 15
Mobile Intel Pentium
1.2.1.
System Memory Interface ............................................................................................. 16
AGP Interface................................................................................................................ 18
Hub Interface................................................................................................................. 18
MCH-M Clocking ........................................................................................................... 18
System Interrupts .......................................................................................................... 19
Host Interface Signals ................................................................................................... 21
DDR Interface................................................................................................................ 23
Hub Interface Signals .................................................................................................... 24
AGP Interface Signals ................................................................................................... 24
2.4.1.
2.4.2.
2.4.3.
2.4.4.
2.4.5.
Clocks, Reset, and Miscellaneous ................................................................................ 30
Voltage References, PLL Power ................................................................................... 31
Pin State Table .............................................................................................................. 31
Conceptual Overview of the Platform Configuration Structure...................................... 36
Standard PCI Bus Configuration Mechanism................................................................ 36
Routing Configuration Accesses ................................................................................... 37
3.3.1.
3.3.2.
3.3.3.
MCH-M Register Introduction........................................................................................ 38
I/O Mapped Registers ................................................................................................... 39
3.5.1.
3.5.2.
Memory Mapped Register Space .................................................................................. 42
3.6.1.
3.6.2.
3.6.3.
3.6.4.
3.6.5.
3.6.6.
Host-Hub Interface Bridge Device Registers – Device #0............................................. 48
3.7.1.
3.7.2.
3.7.3.
3.7.4.
System Bus Error Checking ........................................................................ 16
AGP Addressing Signals ............................................................................. 24
AGP Flow Control Signals ........................................................................... 25
AGP Status Signals..................................................................................... 25
AGP Strobes ............................................................................................... 26
AGP/PCI Signals-Semantics ....................................................................... 27
PCI Bus #0 Configuration Mechanism ........................................................ 37
Primary PCI and Downstream Configuration Mechanism........................... 37
AGP Configuration Mechanism ................................................................... 38
CONFIG_ADDRESS – Configuration Address Register............................. 39
CONFIG_DATA - Configuration Data Register ........................................... 41
DRAMWIDTH—DRAM Width Register....................................................... 43
DQCMDSTR – Strength Control Register for DQ and CMD Signal
Groups ........................................................................................................ 44
CKESTR – Strength Control Register for CKE Signal Group ..................... 45
CSBSTR – Strength Control Register for CS# Signal Group...................... 46
CKSTR – Strength Control Register for CK Signal Group (CK / CK#)........ 47
RCVENSTR – Strength Control Register for RCVENOUT# Signals........... 48
VID – Vendor Identification Register – Device#0 ........................................ 51
DID – Device Identification Register – Device#0......................................... 51
PCICMD – PCI Command Register – Device #0 ........................................ 52
PCISTS – PCI Status Register – Device #0................................................ 53

4 Processor-M Host Interface .................................................... 15
Datasheet
Intel
®
82845MP/82845MZ Chipset-Mobile (MCH-M)
3