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Intel® 845 Chipset: 82845 MCH for SDR: Datasheet
Intel® 845 Chipset: 82845 Memory Controller Hub (MCH) for SDR: Datasheet, January 2002. Describes the 82845 Memory Controller Hub for use with SDR (Single Data Rate) memory devices, and provides an overview of the Intel® 845 chipset. Intel® Pentium® 4 Processor (478 pin package) Support
Intel® 845 Chipset: 82845 Memory Controller Hub (MCH) for SDR: Datasheet, January 2002.
Describes the 82845 Memory Controller Hub for use with SDR (Single Data Rate) memory devices, and provides an overview of the Intel® 845 chipset. Includes:
• Enhanced Mode Scalable Bus Protocol• 2x Address, 4x Data• System Bus interrupt delivery• 400 MHz system bus• System Bus Dynamic Bus Inversion (DBI)• 32-bit system bus addressing• 12 deep In-Order Queue• AGTL+ bus driver technology with integrated AGTL+ termination resistors
System Memory Support
• Directly supports one SDR SDRAM channel, 64 bits wide (72 bits with ECC)• 133 MHz Single Data Rate (SDR) SDRAM devices• 64 Mb, 128 Mb, 256 Mb, and 512 Mb technologies for x8 and x16 devices• By using 64 Mb technology, the smallest memory capacity possible is 32 MB.• Configurable optional ECC operation (single bit Error Correction and multiple bit Error Detection)• Page sizes of 2 KB, 4 KB, 8 KB, and 16 KB (individually selected for every row)• Thermal management• Maximum of 3 Double-Sided DIMMs (6 rows populated) with unbuffered PC133 (with or without ECC) Note: Mixed mode, populating ECC and Non-ECC Memories simultaneously is not supported.• 3 GB Maximum using 512 Mb technology• Supports up to 24 simultaneous open pages• Maximum memory bandwidth of 1.067 GB/s with PC133 Hub Interface to Intel® 82801BA ICH2• 266 MB/s point-to-point hub interface to ICH2• 66 MHz base clock• MSI interrupt messages, power management state change, SMI, SCI, and SERR error indication• Accelerated Graphics Port (AGP) Interface • Supports a single AGP device (either a connector or on the motherboard)• Supports AGP 2.0 including 1x, 2x, and 4x AGP data transfers and 2x/4x Fast Write protocol• Supports only 1.5 V AGP electrical characteristics• 32 deep AGP request queue• Delayed transaction support for AGP-to-System Memory FRAME# semantic reads System Interrupt Support• System bus interrupt delivery mechanism• Interrupts signaled as upstream memory writes from AGP/PCI• Supports peer MSI between hub interface and AGP• Provides redirection for IPI and upstream interrupts to the system bus
Power Management
Read the full Intel® 845 Chipset 82845 MCH for SDR Datasheet.

Intel® 845 Chipset: 82845 MCH for SDR: Datasheet
Intel® 845 Chipset: 82845 Memory Controller Hub (MCH) for SDR: Datasheet, January 2002. Describes the 82845 Memory Controller Hub for use with SDR (Single Data Rate) memory devices, and provides an overview of the Intel® 845 chipset. Intel® Pentium® 4 Processor (478 pin package) Support
Intel® 845 Chipset: 82845 Memory Controller Hub (MCH) for SDR: Datasheet, January 2002.
Describes the 82845 Memory Controller Hub for use with SDR (Single Data Rate) memory devices, and provides an overview of the Intel® 845 chipset. Includes:
• Enhanced Mode Scalable Bus Protocol• 2x Address, 4x Data• System Bus interrupt delivery• 400 MHz system bus• System Bus Dynamic Bus Inversion (DBI)• 32-bit system bus addressing• 12 deep In-Order Queue• AGTL+ bus driver technology with integrated AGTL+ termination resistors
System Memory Support
• Directly supports one SDR SDRAM channel, 64 bits wide (72 bits with ECC)• 133 MHz Single Data Rate (SDR) SDRAM devices• 64 Mb, 128 Mb, 256 Mb, and 512 Mb technologies for x8 and x16 devices• By using 64 Mb technology, the smallest memory capacity possible is 32 MB.• Configurable optional ECC operation (single bit Error Correction and multiple bit Error Detection)• Page sizes of 2 KB, 4 KB, 8 KB, and 16 KB (individually selected for every row)• Thermal management• Maximum of 3 Double-Sided DIMMs (6 rows populated) with unbuffered PC133 (with or without ECC) Note: Mixed mode, populating ECC and Non-ECC Memories simultaneously is not supported.• 3 GB Maximum using 512 Mb technology• Supports up to 24 simultaneous open pages• Maximum memory bandwidth of 1.067 GB/s with PC133 Hub Interface to Intel® 82801BA ICH2• 266 MB/s point-to-point hub interface to ICH2• 66 MHz base clock• MSI interrupt messages, power management state change, SMI, SCI, and SERR error indication• Accelerated Graphics Port (AGP) Interface • Supports a single AGP device (either a connector or on the motherboard)• Supports AGP 2.0 including 1x, 2x, and 4x AGP data transfers and 2x/4x Fast Write protocol• Supports only 1.5 V AGP electrical characteristics• 32 deep AGP request queue• Delayed transaction support for AGP-to-System Memory FRAME# semantic reads System Interrupt Support• System bus interrupt delivery mechanism• Interrupts signaled as upstream memory writes from AGP/PCI• Supports peer MSI between hub interface and AGP• Provides redirection for IPI and upstream interrupts to the system bus
Power Management
Read the full Intel® 845 Chipset 82845 MCH for SDR Datasheet.

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