ZCU106 Board User Guide 121
UG1244 (v1.0) March 28, 2018 www.xilinx.com
Chapter 3: Board Component Descriptions
System Reset Pushbuttons
[Figure 2-1, callout 27]
Figure 3-47 shows the reset circuitry for the PS.
PS_POR_B Reset
Depressing and then releasing pushbutton SW4 causes net PS_POR_B to strobe Low. This
reset is used to hold the PS in reset until all PS power supplies are at the required voltage
levels. It must be held Low through PS power-up. PS_POR_B should be generated by the
power supply power-good signal. When the voltage at IN1 is below its threshold or EN1
(P.B. switch SW4 is pressed) goes Low, OUT1 (PS_POR_B) goes Low.
X-Ref Target - Figure 3-47
Figure 3-47: PS SRST_B and POR_B Pushbutton Switches SW3 and SW4
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