Evaluation Board Manual
PPC750FX Evaluation Board
Preliminary
Jumpers
Page 50 of 115
750FXebm_ch9.fm
June 10, 2003
9.1 Write-Protect 32-Bit Flash
32-bit Flash memory can be rendered read-only (write-protected) by this jumper. This is a 1x2 Berg type
header.
9.2 Ignore Fan
There is one fan on this board that cools both of the PPC750FX processor modules. The connector for the
fan power provides a feedback signal to the CPLD indicating a properly functioning fan. When the jumper at
J16 is installed, the fan is not monitored. Removing the jumper at J16 allows LED DS3 to be activated if the
fan fails or is not connected.
In normal operation, a fan failure causes the power to the processors and system controller to be shut down.
The J16 jumper can be used to avoid this power shutdown if the user wishes to continue operation following
a fan failure. It is the user’s responsibility to ensure that adequate cooling is available to the processors and
system controller if the fan is not operating and J16 is installed.
Note: If the jumper at J16 is installed, the Check Fan LED is turned on as an indication to the user that the
fan is not being monitored.
These are 1x2 Berg type headers.
Figure 9-2. Write-Protect 32-bit Flash Memory Jumper—J8
Table 9-2. Write-Protect 32-bit Flash Memory—J8
J8
Description
Factory Setting
1–2
Write Protected (read-only)
Open
Write Enabled
X
Figure 9-3. Ignore Fan Jumper—J16
Table 9-3. Ignore Fans—J16
J16
Description
Factory Setting
1–2
Ignore fan
Open
Monitor fan
X
1
2
1
2
