30-Oct-2020, Rev. 1.1
25
Vin
PWR_EN
VCCIO_EN
PG_CARRIER
Figure 9 – Power Sequencing
The 3.3V regulator on the carrier is enabled by the VCCIO_EN signal which in
truns enables the VCCIO regulators. The VCCIO regulators are sequenced in
series and cannot be enabled until Zynq’s core power is valid. The
PG_CARRIER (on IOCC) and PG_MODULE (on MicroZed) signals are wired
OR and tied to the Zynq Power On Reset signal. When the power supplies are
valid on both the SOM and carrier, the PG signal de-asserts the Zynq POR
signal.
2.8.4
Bypassing/Decoupling
The IOCC follows the recommended decoupling techniques per each manufacturer’s
datasheet.
2.8.5
System Power Good LED
A green status LED indicates when PG_CARRIER and/or PG_MODULE is good.