2.23 Real-Time Clock (RTC)
Zynq Ultrascale+ devices include an internal real-time clock. The internal RTC can be accessed by the plat-
form management unit (PMU) - more information on the PMU is available in the Zynq UltraScale+ MPSoC
Technical Reference Manual [18].
The RTC crystal pad input and crystal pad output are connected on the Mercury+ XU6 SoC module to a
32.768 kHz oscillator.
A 1.5 V LDO is used to generate the battery voltage for the built-in RTC (supplied to VCC_PSBATT pin), based
on the VCC_BAT voltage mapped to the module connector. This pin can be connected directly to a 3 V
battery on the base board. Please refer to the Enclustra Module Pin Connection Guidelines [10] for details.
2.24 Secure EEPROM
The secure EEPROM is used to store the module type and serial number, as well as the Ethernet MAC address
and other information. It is connected to the I2C bus.
The secure EEPROM must not be used to store user data.
Please refer to Section 4.4 for details on the content of the EEPROM.
2.24.1 EEPROM Type
Table 31 describes the equipped EEPROM device type on the Mercury+ XU6 SoC module.
Type Manufacturer
ATSHA204A-MAHDA-T (default) Atmel
DS28CN01 (assembly option) Maxim
Table 31: EEPROM Type
An example demonstrating how to read data from the EEPROM is included in the Mercury+ XU6 SoC module
reference design [2].
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