82830MP Datasheet, PDF (123/159 Pages) Intel Corporation – Intel 830MP Chipset: 82830MP Graphics and Memory Controller Hub (GMCH-M)

Intel^® 830MP Chipset
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5.5.2
The process of latching all information required to complete the transaction, terminating with Retry, and
completing the request without holding the master in wait-states is called a Delayed Transaction. The
GMCH-M latches the Address and Command when establishing a Delayed Transaction. The GMCH-M
generates a Delayed Transaction on the AGP only for SDRAM read accesses.
GMCH-M Power and Thermal Management
The following list provides the GMCH-M Power and Thermal Management Features:
• ACPI 1.0b & 2.0 support
• Mobile Power Reduction operating modes (C3, S1)
• System States: S0, S1, S3, S4, S5
• CPU States: C0, C1, C2, C3
• Compatible with Intel 815EM AGP Busy/Stop protocol
• Intel SpeedStep technology support
• Thermal Throttling for Main memory
ACPI 2.0 Support
Advanced Configuration and Power Management Interface (ACPI) primarily describes and runs
motherboard devices. It is completely controlled by the operating system that OS drivers directly power
down PCI/AGP devices. System or SMI BIOS plays a part of waking the system, however. Device
drivers save and restore state while bus drivers change the physical power state of the device.
The GMCH-M power management architecture is designed to allow single systems to support multiple
suspend modes and to switch between those modes as required. A suspended system can be resumed
via a number of different events. The system returns to full operation where it can continue processing
or be placed into another suspend mode (potentially a lower power mode than it resumed from).
GMCH-M supports the minimum requirements for ACPI support. GMCH-M must support the minimum
requirements for both system logic and for graphics controllers, as well as be capable of controlling
monitors minimum functions. The transition sequences of entering and exiting system, CPU and
graphics states are described in respective sections below.
ACPI States Supported
The Intel 830MP chipset supports the following ACPI States:
1.
System States
G0/S0 Full On
G1/S1 Power On Suspend (POS). System Context Preserved.
G1/S3 Suspend to RAM (STR). Power and context lost to chipset.
G1/S4 Suspend to Disk (STD). All power lost (except wakeup on ICH3-M)
G2/S5 Hard off. Total reboot.
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Datasheet
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