phyCORE-OMAP44xx
Part I: PCM-049/phyCORE-OMAP44xx System on Module
L-760e_1 © PHYTEC Messtechnik GmbH 2012
45
1.6.3 I
2
C EEPROM (U2)
The phyCORE-OMAP44xx is populated with a Catalyst 24WC32C
1
non-volatile 32 kB EEPROM with I
2
C interface at
U2. This memory can be used to store configuration data or other general purpose data. This device is accessed
through I
2
C port 1 on the OMAP44xx. The control registers for I²C port 1 are mapped between addresses
0x4807 0000 and 0x48071FFF. Please see the OMAP44xx Reference Manual for detailed information on the
registers.
Three solder jumpers are provided to set the lower address bits: J1, J2 and J3. Refer to
details on setting these jumpers.
Write protection to the device is accomplished via jumper J5. Refer to
for further details on
setting this jumper.
1.6.3.1 Setting the EEPROM Lower Address Bits (J1, J2, J3)
The 32 kB I
2
C EEPROM populating U2 on the phyCORE-OMAP44xx module has the capability of configuring the
lower address bits A0, A1, and A2. The four upper address bits of the device are fixed at ‘1010’ (see CAT24WC32C
data sheet). The remaining three lower address bits of the seven bit I
2
C are configurable using jumpers J1, J2
and J3. J2 sets address bit A0, J1 address bit A1, and J3 address bit A2.
below shows the resulting seven bit I
2
C device address for the eight possible jumper configurations.
1.6.3.2 EEPROM Write Protection Control (J5)
Jumper J5 controls write access to the EEPROM (U2) 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:
1.
See the manufacturer’s data sheet for interfacing and operation
U2 I
2
C Device Address
J3
J1
J2
1010 000
1 + 2
1 + 2
1 + 2
1010 001
1 + 2
1 + 2
2 + 3
1010 010
1 + 2
2 + 3
1 + 2
1010 011
1 + 2
2 + 3
2 + 3
1010 100
2 + 3
1 + 2
1 +2
1010 101
2 + 3
1 + 2
2 + 3
1010 110
2 + 3
2 + 3
1 + 2
1010 111
2 + 3
2 + 3
2 + 3
Table 13:
U2 EEPROM I
2
C Address via J1, J2, and J3
1
1.
Defaults are in
bold blue
text
EEPROM Write Protection State
J5
Write access allowed
closed
Write protected
open
Table 14:
EEPROM Write Protection States via J5
1
1.
Defaults are in
bold blue
text
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