Warning!
The USB 3.0 interface on the Mercury+ XU8 SoC module uses the GTR lines (MGTPS signals on module
connector B), and not the USB_SSRX_P/N and USB_SSTX_P/N connections on module connector A.
2.23 Display Port
Xilinx Zynq Ultrascale+ devices feature two built-in DisplayPort controllers and PHYs, supporting up to two
lanes at a 5.4 Gbit/sec line rate. Each lane is represented by one of the PS GTR lines, available on the module
connector.
A 27 MHz differential clock is available on the module and connected to PS_MGTREFCLK3 pins, to be used
as a reference clock for the DisplayPort interface. It is also possible to provide another reference clock from
the base board to the MGTPS_REFCLK* pins.
Details on the built-in DisplayPort controller and on the usage of the PS GTR lanes is available in the Zynq
UltraScale+ MPSoC Technical Reference Manual [18] and in the Zynq UltraScale+ MPSoC Overview [22].
2.24 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+ XU8 SoC module to a
32.768 kHz oscillator.
A 1.2 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.
2.25 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.
2.25.1 EEPROM Type
Table 35 describes the equipped EEPROM device type on the Mercury+ XU8 SoC module.
Type Manufacturer
ATSHA204A-MAHDA-T (default) Atmel
DS28CN01 (assembly option) Maxim
Table 35: EEPROM Type
An example demonstrating how to read data from the EEPROM is included in the Mercury+ XU8 SoC module
reference design [2].
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