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About the Module
The memory chip also provides these features:
1024-bit EEPROM memory organized as four memory pages of 256 bits each.
Memory pages that can be individually write-protected or put in EPROM-
emulation mode
8-byte scratch pad
Communication over the single-conductor 1-wire bus. Communication
follows standard Dallas Semiconductor 1-wire protocol.
Communication with Host with a single digital signal at 15.4kbps or 111kbps
using the 1-wire protocol
Its own unalterable and unique 64-bit ROM registration number that is
factory lasered into the chip
The DS2431 is a 1024-bit 1-wire EEPROM chip organized as four memory pages of
256-bit each. Data is written to an 8-byte scratch pad, verified and then copied to
the EEPROM memory.
The ConnectCore XP 270 module uses GPIO87 for “bit-toggling” and implementing the
1-wire protocol to communicate with this device. For more information, see the
DS2431 datasheet.
This table shows the 1-wire EEPROM memory map:
Address range
0x000–0x001F
Type
R/(W)
Description
Data Memory Page 0
Protection codes
Used for MAC ADDRESS
0x0020–0x003F
0x0040–0x005F
0x0060–0x007F
R/(W)
R/(W)
R/(W)
Data Memory Page 1
Data Memory Page 2
Data Memory Page 3
0x0080
R/(W)
Protection Control Byte
Page 0
0x55: Write Protect
0xAA: EPROM mode
0x55 or 0xAA: Write protect 0x80
0x0081
R/(W)
Protection Control Byte
Page 1
0x55: Write Protect
0xAA: EPROM mode
0x55 or 0xAA: Write protect 0x81
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