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MP N/B Maintenance
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1.3.3 The Mobile Intel 915GM Express Chipset
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Supports tight ppm accuracy clocks for Serial-ATA and SRC
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Supports spread spectrum modulation, 0 to –0.5% down spread
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Uses external 14.318MHz crystal, external crystal load caps are required for frequency tuning
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Supports undriven differential CPU, SRC pair in PD# for power management
14.318MHz crystal and generates CPU outputs up to 400MHz. It provides the tight ppm accuracy required by Serial
ATA and PCI-Express.
The Mobile Intel 915GM Express Chipset is a memory controller hub (GMCH) designed for use with the Dothan,
Yonah and Intel Celeron M Processor. It supports Intel Graphics Media Accelerator 900 & PCI Express based
Graphics.
The 915GM GMCH integrates a system memory DDR/DDR2 controller with two, 64-bit wide interfaces. Only
Double Data Rate (DDR/DDR2) memory is supported; the buffers support DDR SSTL_2 and DDR2 SSTL_18
signaling interfaces. The memory controller interface is fully configurable through a set of control registers. It
supports a high performance transition interface PCI Express Interface. PCI Express operates at a data rate of 2.5
GB/s. This allows a maximum theoretical bandwidth of 40 GB/s each direction. The 915GM GMCH integrates
Direct media interface (DMI) chip-to-chip interconnect between the GMCH and ICH6-M. DMI supports DMI x2
and DMI x4 configuration.
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