Intel 815 - Manual (Page 133)

Clocking
R
Intel
®
815 Chipset Platform Design Guide 133
11.2 3-DIMM Clocking
Table 29 shows the characteristics of the clock generator for a 3-DIMM solution.
Table 29. Intel
®
CK-815 (3-DIMM) Clocks
Number Clock Frequency
2 processor clocks 66/100/133 MHz
13 SDRAM clocks 100 MHz
2 PCI clocks 33 MHz
1 APIC clocks 33 MHz
2 48 MHz clocks 48 MHz
3 3V, 66 MHz clocks 66 MHz
1 REF clock 14.31818 MHz
The following bullets list the features of the Intel CK-815 clock generator:
•
Thirteen copies of SDRAM clocks
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Two copies of PCI clock
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One copy of APIC clock
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One copy of 48 MHz USB clock (3.3V) (non-SSC) (type 3 buffer)
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One copy of 48 MHz DOT clock (3.3V) (non-SSC) (see DOT details)
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Three copies of 3V, 66 MHz clock (3.3V)
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One copy of ref. clock @ 14.31818 MHz (3.3V)
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Ref. 14.31818 MHz xtal oscillator input
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Spread-spectrum support
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I 2 C support for turning off unused clocks
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56-pin SSOP package
Figure 69 shows the Intel
®
815E chipset platform clock architecture for a 3-DIMM solution.