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Zynq Ult MPSoC SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
3.1.2
Power Input Sequencing
The Zynq Ult MPSoC SOM Power Input sequence requirement is explained below.
Power up Sequence:
•
VRTC_3V0 must come up at the same time or before VCC_5V comes up.
•
SOMPWR_EN signal from Board to Board Connector1 must be high at the same time or after VCC_5V comes
up.
Power down Sequence:
•
SOMPWR_EN signal from Board to Board Connector1 must be low at the same time or before VCC_5V goes
down.
•
VCC_5V must go down at the same time or before VRTC_3V0 goes down.
Figure 9: Power Input Sequencing
Table 11: Power Sequence Timing
Item
Description
Value
T1
VRTC_3V0 rise time to VCC_5V rise time
≥ 0 ms
T2
VCC_5V rise time to SOMPWR_EN rise time
≥ 0 ms
T3
SOMPWR_EN fall time to VCC_5V fall time
≥ 0 ms
T4
VCC_5V fall time to VRTC_3V0 fall time
≥ 0 ms