frequency generator & integrated buffers.
* 3 - CPUs @ 2.5V/3.3V, up to 100MHz.
* 3 - AGPCLK @ 3.3V
* 13 - SDRAM @ 3.3V, up to 100MHz.
* 6 - PCI @ 3.3V, including one free running.
* 1 - 48MH.
Ref (0:2), XTAL power supply, nominal 3.3V 14.318 Mhz reference clock. Indicates whether VDDL2 is 3.3V or 2.5V. High=2.5V CPU, LOW=3.3V C P U 1. L a t c h e d i n p u t 2 Ground Crystal input, has internal load cap (33pF) and feedback resistor from X.
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