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Hardware/Software Interface
20BL70S00 E3

2018-06-11 Page 62
4 Hardware/Software Interface
This chapter is intended for software developers or board integrators who need deeper
knowledge of the implementation details of the BL70S interfaces and its internal
connections.
4.1 SMBus/I2C Devices
Table 29. 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

Ignition status

PCIe Mini Card power cycle

SIM card switching

User LEDs

Watchdog reset
smb2_ctrl smb2_1
0x42 0x21
I/O Expander, used for

SATA LED control
smb2_ctrl smb2_1
0x64 0x32
System RTC (ERTC) RX-8571
0x9A 0x4D
Board Management Controller (BMC) xm01bc_ctrl
xm01bc_1
0xA0 0x50
SPD EEPROM channel A -
0xA4 0x52
SPD EEPROM channel B -
0xAC 0x56
EEPROM, includes BL70S information, e.g.,
serial number and the date of production
smb2_boardident
smb2_1
0xAE 0x57
CPU board (SC25) information EEPROM with
thermal sensor
smb2_boardident
smb2_1
0xC0 0x60
PoE PIC, used for

PoE interface control

PoE device switching
smb2_poe smb2_1
0xE0 0x70
SATA SGPIO FPGA smb2_ctrl
smb2_1
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.