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Hardware/Software Interface
20G025A00 E3

2017-04-20 Page 59
5 Hardware/Software Interface
This chapter is intended for software developers or board integrators who need deeper
knowledge of the implementation details of the G25A interfaces and its internal
connections.
5.1 PCI Express Root Port Interrupt Mapping
Table 30. PCI Express Root Port Interrupt Mapping for Downstream Devices
5.2 SMBus/I2C Devices
Table 31. SMBus/I2C devices
Port INTA# INTB# INTC# INTD#
1 INTA# INTB# INTC# INTD#
2 INTB# INTC# INTD# INTA#
3 INTC# INTD# INTA# INTB#
4 INTD# INTA# INTB# INTC#
5 INTA# INTB# INTC# INTD#
6 INTB# INTC# INTD# INTA#
7 INTC# INTD# INTA# INTB#
8 INTD# INTA# INTB# INTC#
8-Bit Address 7-Bit Address Function MDIS Device Name
0x9A 0x4D
Board Management Controller (BMC) xm01bc_1
0x3E 0x1F
Board temperature sensor -
0x64 0x32
System RTC (ERTC) RX-8571, see also Chapter 3.5
Real-Time Clock (RTC) on page 36
-
0x6E 0x37
EEPROM: protected register -
0x88 0x44
Intel Management Engine (ME) -
0xAE 0x57
Board information EEPROM with thermal sensor smb2_2
0xE0 0x70
SATA SGPIO FPGA, see Chapter 5.3 SATA SGPIO
FPGA on page 60
smb2_2
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.