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Hardware/Software Interface
20BL51E00 E2

2020-03-27 Page 84
5.1.1 BL51E Information EEPROM
The following table provides the internal byte structure of the BL51E information
EEPROM at address
0xAC/0x56.
Table 68. SMBus/I2C – Board information EEPROM – address map
Table 69. SMBus/I2C – Board information EEPROM – byte structure of production data
Table 70. SMBus/I2C – Board information EEPROM – production data – production/last repair
dates
Note on 8-Bit/7-Bit Addressing

8-bit addressing is compliant to the Windows nomenclature. The last
bit, which is used as the read/write bit, is added to the address
(0 = write, 1 = read).
If you use MDIS driver software, use 8-bit addresses, with any OS.

7-bit addressing is used, e.g., under Linux. A ’0’ is added at the
beginning of the address so that all consecutive address bits are moved
one bit to the right.
If you use standard I2C commands under Linux, use 7-bit addresses.
Address Range Size I2C Device
0x00 – 0x1F
32 bytes Production data, see Table 69, SMBus/I2C –
Board information EEPROM – byte
structure of production data
Byte(s) Description
1 byte Production data ID
3 bytes Hardware revision xx.yy.zz
4 bytes Board serial number
1 byte Board model (usually the last two digits of the article number,
e.g., ’01’)
6 bytes Hardware name (ASCII string, e.g., ’BL51E’)
1 byte Reserved
2 bytes Production date (big-endian format)
2 bytes Last repair date (big-endian format)
4 bytes Reserved
Bit 15 14 13 12 11 10 9 8
Name
Year Month[3]
Access
R R
Bit 7 6 5 4 3 2 1 0
Name
Month[2:0] Day
Access
R R