MEN ME4, User Manual

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Hardware/Software Interface
20ME04-00 E2

2020-02-25 Page 38
4 Hardware/Software Interface
This chapter is intended for software developers or board integrators who need deeper
knowledge of the implementation details of the ME4 interfaces and its internal
connections.
4.1 SMBus/I2C Devices
Depending on the position of the ME4 within the modular DIN-Rail system, the SMBus
address may differ. The following table gives an overview of the SMBus devices within a
complete DIN-Rail system, not only for an individual module.
Table 9. SMBus/I2C devices
Note: All other addresses and devices are reserved for factory usage.
See Table 9, SMBus/I2C devices on page 38 and Figure 6, System positions within a
modular DIN-Rail system on page 39 to find out the relevant SMBus address for each
ME module.
Bus 8-Bit Address 7-Bit Address Function
1
0x64 0x32
System RTC (ERTC) on CPU module
0x9C 0x4E
Board Management Controller (BMC) on CPU module
Dedicated I/O for CPU module
0x40 0x20
CPU module (position 1)

MC50M/MC50I: CPU Module User LED and Ignition Watchdog
Dedicated I/O for ME module

ME1: User LED and Wireless Card Enable Register

ME2: Not applicable

ME3: Not applicable

ME4: User LED and Wireless Card Enable Register
0x4A 0x25
ME module (position 2)
0x48 0x24
ME module (position 3)
0x46 0x23
ME module (position 4)
0x44 0x22
ME module (position 5)
0x42 0x21
ME module (position 6)
Board information EEPROM
0xAE 0x57
CPU module (position 1)
0xAC 0x56
Carrier board of CPU module (position 1)
0xAA 0x55
ME module (position 2)
0xA8 0x54
ME module (position 3)
0xA6 0x53
ME module (position 4)
0xA4 0x52
ME module (position 5)
0xA2 0x51
ME module (position 6)