Page 88 - GIGABYTE Service Manual-v3.0-110101

5.2.10 Clock Fail

Example: Intel
P35-DS3 identified by:

01. Post code C1.
02. CPU Socket PIN bent
03. FSBSEL2 fail (FSBSEL2 should be pulled low by CPU for 200MHz setting)
Signal Explanation:
FSBSEL2; Frequency Select Signals for FSB this signals are used to select the

frequency of the processor input clock (BCLK [1:0]). The required frequency is
determined by the processor, chipset, and clock synthesizer. All agents must operate at
the same frequency. The Pentium 4 processor in the 775 -land package currently

operates at a 533 MHz or 800 MHz FSB frequency (selected by a 133 MHz or 200 MHz
BCLK [1:0] frequency).
Because clock setting fails, so system lock up and post code C1. Clock generator fail
would also cause the same problem. Please also check FSBSEL0~2, BSEL166_0~3 for
this issue.

Figure 5-15: Clock Fail (FSBSEL)

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