wrong power sequencing of FPGA
SCB v3.4 power sequencing does no work as expected. The circuit consists of D3, D4 and R243. However, the 1.2V is enough to enable IC47 - 2.5V converter even when +1V0 is disabled. The IC47 threshold is 2V for H state, but it must be <0.3 for low state. It means we operate in forbidden zone. In real life, the IC47 gets enabled with EN voltage as low as 1.2V. It may affect the FPGA lifetime when the power of the switch is often toggled, which is not typical scenario.