Switches; Reset Pushbutton; Table 6-1. Switches; Table 6-2. Reset Pushbutton-U5 - IBM PPC750FX User Manual

Preliminary

6. Switches

This section shows the location of all the switches on the board, and explains the function of each switch.

Table 6-1. Switches

Location
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

6.1 Reset Pushbutton
When pressed, the pushbutton switch at U5 pulls the PWRGD signal to ground, causing a reset of the board.
Table 6-2. Reset Pushbutton—U5
Signal
Pulls down PWRGD.
750FXebm_ch6.fm
June 10, 2003
Function
Main board reset.
PPC750FX Evaluation Board
U53
ATX Power
Description (0 = ON = close)
Evaluation Board Manual
Page
39
42
40
41
40
U5
Off On
Reset
1
U17
8
On
Off
1
U24
8
1
U30
8
Off On
1
U35
8
Switches
Page 39 of 115