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Hardware/Software Interface
20BL51E00 E2

2020-03-27 Page 83
5 Hardware/Software Interface
This chapter is intended for software developers or board integrators who need deeper
knowledge of the implementation details of the BL51E interfaces and its internal
connections.
5.1 SMBus/I2C Devices
Table 67. SMBus/I2C devices
Note: All other addresses and devices are reserved for factory usage.
Bus 8-Bit Address 7-Bit Address Function MDIS Example Call
1
0x3E 0x1F
Board temperature sensor smb2_eetemp
smb2_1
0x40 0x20
I/O Expander, used for

User LEDs

GPS module
-
0x42 0x21
I/O Expander, used for

PCIe Mini Card power cycle

SIM card switching
-
0x44 0x22
I/O Expander, used for

Odometer interface

Relay outputs
0x4E 0x27
I/O Expander, used for

Isolated inputs (read-back)

Watchdog reset
0x64 0x32
System RTC (ERTC) RX-8571 -
0x9A 0x4D
Board Management Controller (BMC) xm01bc_ctrl
xm01bc_1 -v
0xA0 0x50
SPD EEPROM channel A
-
0xA4 0x52
SPD EEPROM channel B -
0xAC 0x56
BL51E information EEPROM, includes, e.g.,
serial number and the date of production
smb2_boardident
smb2_1
0xAE 0x57
CPU board information EEPROM with
thermal sensor
smb2_boardident
smb2_1
0xE0 0x70
SATA SGPIO FPGA smb2_ctrl
smb2_1