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PCM-4862 would fail bootup at 45 degC when using DX2-66 CPU

2005-07-27 Application Document No.1-0003431

Related Product:

Solution:

  • PCM-4862 would fail bootup at 45 degC when using DX2-66 CPU

    The below table is the test result for PCM-4862 with different 486 CPUs . The
    test target boards are from customer , S/N is S8L010030849 and S8901528. It
    seems that the high speed CPU (3.3V) would be stable on PCA-4862 . I also found
    if disable external cache then no fail occurred on PCM-4865 with any kind of
    486 CPU .

    45~60C
    60C+
    Intel DX-33 (5v) Fail Pass
    Intel DX2-66 (5v) Fail Pass
    Cyrix DX2-80 (5v) Fail Pass
    AMD DX4-100 (3.3v) Pass Pass
    AMD 5x86-133 (3.3v) Pass Pass
    notes: Fail means that can not boot up from floppy driver .

    Problem: PCM-4862 would fail at 45C when using DX2-66 CPU

    Solution: To remove C42 ,C43 . See the below chart.

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