Enclustra Mars ZX3 - RTC Type; Secure EEPROM; EEPROM Type; Revision Detection

Note that the frequency output mode of the RTC must be disabled when using I2C interrupt system. Other-
wise, I2C_INT# is periodically pulled down by the RTC. The disabling of this function can be done by setting
bits [3:0] of the RTC register 8 to logic low.
2.20.1 RTC Type
Table 29 describes the equipped RTC device type on the Mars ZX3 SoC module.
Type Manufacturer
ISL12020M Intersil
Table 29: RTC Type
An example demonstrating how to use the RTC is included in the Mars ZX3 SoC module reference design
[2].
2.21 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.
2.21.1 EEPROM Type
Table 30 describes the equipped EEPROM device type on the Mars ZX3 SoC module.
Type Manufacturer
DS28CN01 (default) Maxim
ATSHA204A-MAHDA-T (assembly option) Atmel
Table 30: EEPROM Type
An example demonstrating how to read data from the EEPROM is included in the Mars ZX3 SoC module
reference design [2].
2.22 Revision Detection
Starting from revision 4 of Mars ZX3 SoC module, a pull-down resistor has been mounted to easily detect
the current revision.
The pin location of this resistor is noted in table 31.
Revision Pin
4 AB21
5 and newer Y21
Table 31: Pin Location of the Revision Detection Resistor
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