downloading ZYNQ UltraScale+ programs or firmware programs to FLASH. In
order to not damage the ZYNQ UltraScale+ chip by plugging and unplugging
under power, we aded a protection diode to the JTAG signal to ensure that the
signal voltage is within the range accepted by the FPGA and avoid damage to
the ZYNQ UltraScale+ chip.
Figure 3-12-1: JTAG Interface Schematic
Part 3.13: Real-time clock
The ZU2CG chip has the function of an RTC real-time clock, with timing
functions such as year, month, day, hour, minute, and second, and week.
External need to connect a 32.768KHz passive clock to provide an accurate
clock source to the internal clock circuit, so that the RTC can accurately provide
clock information. At the same time, in order for the real-time clock to operate
normally after the product is powered off, it is generally necessary to equip the
coin battery (model LR1130, voltage is 5V) to supply power to the clock chip.
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