phyFLEX
®
-i.MX 6 [PFL-A-XL1-xxx
40 PHYTEC Messtechnik GmbH 2013 L-773e_2
6.3.1 EEPROM Write Protection Control (J3)
Jumper J3 controls write access to the EEPROM (U10) device.
Closing this jumper allows write access to the device, while removing
this jumper will cause the EEPROM to enter write protect mode,
thereby disabling write access to the device.
The following configurations are possible:
EEPROM Write Protection State J3
Write access allowed closed
Write protected open
Table 14: EEPROM write protection states via J3
6
Note: If the jumper is not set, the write protection signal can also be
changed by GPIO3_19 of the i.MX 6 controller.
6.4 SPI Flash Memory (U25) )
The optional SPI Flash Memory of the phyFLEX-i.MX 6 at U25 can
be used to store configuration data or any other general purpose data.
Beside this it can also be used as boot device. The device is accessed
through eCSPI3 CS0 on the i.MX 6. The control registers for eCSPI3
are mapped between addresses 0x0201 0000 and 0x0201 3FFF. Please
see the i.MX 6 Reference Manual for detailed information on the
registers.
As of the printing of this manual these SPI Flash devices generally
have a life expectancy of at least 100,000+ erase/program cycles and a
data retention rate of 20 years. This makes the SPI Flash a reliable and
secure solution to store the first and second level bootloaders.
6
: Defaults are in bold blue text
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