Intel Pentium III Processor/840, Manual, Page: 54 / 151

4-18 Intel
®
Pentium
®
III Processor/840 Development Kit Manual
Hardware Reference
4.10.1 P1/P0 Present Override (J10/J42)
The Intel Pentium
III
processor/840 evaluation board will not power on if both processors are not
installed. To override this function (for board testing), install jumpers on J10 and J42.
During a boot up sequence, the hardware checks whether the processors are present. To boot the
board without the hardware recognizing a processor, the jumper must be set to the IN position. To
override the CPU detection for P0, jumper J42 must be set to the IN position. To override P1, J10
must be set to the IN position. To boot the board without either processor being enabled, both
jumpers must be set. When operating in uni-processor mode, the jumper need not be set to ignore
the processor. The terminator in the second socket will inform the hardware that no processor is
present.
4.10.2 Single Processor ITP Pass (J11)
This jumper allows the TDO of CPU P0 to connect to the TDI of P1 (DP mode, default) or to
connect directly to the ITP connector (UP mode).
OUT 1
P1 VRM VID J11P4 1-2 P1_VID0 X
3-pin (1x3) Header 2-3 0
OUT 1
J11P3 1-2 P1_VID1 X
2-3 0
OUT 1
J11R3 1-2 P1_VID2 X
2-3 0
OUT 1
J11R2 1-2 P1_VID3 X
2-3 0
OUT 1
J11R1 1-2 P1_VID4
2-3 0 X
OUT 1
Table 4-29. Default Jumper Settings (Sheet 2 of 2)
Jumper Name Jumper Connection Function Default