Features

Figure 6-1. Processor Low Power State Machine

Normal State

Normal execution

HALT or MWAIT Instruction and HALT Bus Cycle Generated

INIT#, BINIT#, INTR, NMI, SMI#, RESET#, FSB interrupts

Enhanced HALT or HALT State BCLK running

Snoops and interrupts allowed

STPCLK#

STPCLK#

Asserted

De-asserted

 

 

Stop-Grant State

BCLK running

Snoops and interrupts allowed

 

 

 

 

 

 

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Snoop Event Occurs

Snoop Event Serviced

Snoop Snoop

Event Event

Occurs Serviced

Enhanced HALT Snoop or HALT Snoop State

BCLK running

Service snoops to caches

Grant Snoop State

BCLK running

Service snoops to caches

6.2.1Normal State

This is the normal operating state for the processor.

6.2.2HALT and Enhanced HALT Powerdown States

The Pentium D processor supports the HALT or Enhanced HALT powerdown state. The Enhanced HALT Powerdown state is configured and enabled via the BIOS. The Enhanced HALT state is a lower power state as compared to the Stop Grant State. If Enhanced HALT is not enabled, the default Powerdown state entered will be HALT. Refer to the sections below for details about the HALT and Enhanced HALT states.

6.2.2.1HALT Powerdown State

HALT is a low power state entered when all the logical processors have executed the HALT or MWAIT instructions. When one of the logical processors executes the HALT instruction, that logical processor is halted; however, the other processor continues normal operation. The processor will transition to the Normal state upon the occurrence of SMI#, BINIT#, INIT#, or LINT[1:0] (NMI, INTR). RESET# will cause the processor to immediately initialize itself.

The return from a System Management Interrupt (SMI) handler can be to either Normal Mode or the HALT Power Down state. See the Intel Architecture Software Developer's Manual, Volume III: System Programmer's Guide for more information.

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Datasheet

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Image 86
Intel 830 manual Normal State, Halt and Enhanced Halt Powerdown States

830 specifications

The Intel 830 chipset, introduced in the early 2000s, marked a significant evolution in Intel's chipset architecture for desktop and mobile computing. Known for its support of the Pentium 4 processors, the 830 chipset was tailored for both performance and stability, making it an appealing choice for OEMs and enthusiasts alike.

One of the standout features of the Intel 830 chipset is its support for DDR SDRAM, providing a much-needed boost in memory bandwidth compared to its predecessors. With dual-channel memory support, the chipset could utilize two memory modules simultaneously, which effectively doubled the data transfer rate and enhanced overall system performance. This made the Intel 830 particularly beneficial for applications requiring high memory throughput, such as multimedia processing and gaming.

Another important characteristic of the Intel 830 was its integrated graphics support, featuring Intel's Extreme Graphics technology. This integration allowed for decent graphics performance without the need for a dedicated GPU, making it suitable for budget systems and everyday computing tasks. However, for power users and gaming enthusiasts, the option to incorporate a discrete graphics card remained available through the provided PCI Express x16 slot.

The Intel 830 chipset also boasted advanced I/O capabilities, including support for USB 2.0, which provided faster data transfer rates compared to USB 1.1, and enhanced IDE interfaces for connecting hard drives and optical devices. With its Hyper-Threading technology support, the chipset allowed for improved multitasking efficiency, enabling a single processor to execute multiple threads simultaneously, a feature that was particularly beneficial in server environments and complex computing tasks.

In terms of connectivity, the Intel 830 supported multiple bus interfaces, including PCI Express and AGP, thereby enabling users to expand their systems with various add-on cards. This flexibility contributed to the chipset's longevity in the marketplace, as it catered to a wide range of user needs from light computing to intensive gaming and content creation.

In summary, the Intel 830 chipset combined enhanced memory capabilities, integrated graphics performance, robust I/O features, and flexible expansion options, making it a versatile choice for various computing environments during its time. It played a key role in shaping the landscape of early 2000s computing, paving the way for future advancements in chipset technology. Its legacy continues to influence modern computing architectures, illustrating the lasting impact of Intel’s innovative design principles.