REF: BBONEBLK_SRM
BeagleBone Black System
Reference Manual
Rev A5.2
Page 86 of 108
The design in
Figure 55
has the write protect disabled. If the write protect is not enabled,
this does expose the EEPROM to being corrupted if the I2C2 bus is used on the cape and
the wrong address written to. It is recommended that a write protection function be
implemented and a Test Point be added that when grounded, will allow the EEPROM to
be written to. To enable write protect, Pin 7 of the EEPROM should be tied to ground.
Whether or not Write Protect is provided is at the discretion of the cape designer.
Variable & MAC Memory
I2C0_SDA
2,4
DGND
WP
TP2
TESTPT1
VDD_3V3B
C102
0.1uf ,16V
I2C0_SCL
2,4
256KX8
U7
CAT24C256W
A0
1
A1
2
A2
3
SCL
6
SDA
5
VCC
8
VSS
4
WP
7
DGND
R210 10K,1%
Figure 55.
Expansion Board EEPROM Write Protect
