Evaluation Board Manual
Preliminary
PPC750FX Evaluation Board
750FXebm_ch6.fm
June 10, 2003
Switches
Page 39 of 115
6. Switches
This section shows the location of all the switches on the board, and explains the function of each switch.
6.1 Reset Pushbutton
When pressed, the pushbutton switch at U5 pulls the PWRGD signal to ground, causing a reset of the board.
Table 6-1. Switches
Location
Function
Page
U5
Reset pushbutton
U17, U24
System controller initialization
U30
CPU 0 PLL configuration
U35
CPU 1 PLL configuration
U53
External ATX power
Figure 6-1. Switch Location Diagram
Table 6-2. Reset Pushbutton—U5
Signal
Description (0 = ON = close)
Pulls down PWRGD.
Main board reset.
U5
Reset
U17
On
Off
1
8
U24
U30
U35
1
8
1
8
1
8
On
Off
On
Off
U53
ATX Power
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