SMART Embedded Computing MC1600, Installation And Use Manual

Page: 78 / 126

78 MC1600 Extreme Edge Server Installation and Use (6806870A02B)
System Overview
System Overview
1.12.3 BMC Private I
2
C Buses
The two private I
2
C buses of the BMC, which are directly connected to the BMC, include
discrete temperature sensors, voltage sensors, an RTC, and an optional FRU EEPROM.
There are also routing resistors on the board that allow connection of these buses to the
Glue CPLD as a BOM option. The I
2
C addresses of the devices are shown in the following
tables.
1.13 Programmable Logic
Two Programmable Logic Device (CPLD) are provided for various functions such as power
up control, CPU interface multiplexing, SMBus routing, and additional glue logic functions
needed on the card.
1.13.1 CPU CPLD
The CPU CPLD on the Extreme Edge Server runs off payload power and is associated with
the two CPU complexes. It implements these major functions:
Table 1-17 BMC I
2
C Bus 8 Devices
7-bit Addr 8-bit Addr Description
0x49 0x92 Temperature sensor
0x4A 0x94 Temperature sensor
0x4B 0x96 Temperature sensor
0x4C 0x98 Temperature sensor
0x50 0xA0 Optional FRU EEPROM (BOM option)
Table 1-18 BMC I
2
C Bus 7 Devices
7-bit Addr 8-bit Addr Description
0x48 0x90 Voltage sensor for CPU1
0x4A 0x94 Voltage sensor for CPU2
0x4D 0x9A Temperature sensor
0x4E 0x9C Temperature sensor
0x57 0xAE EEPROM
0x6F 0xDE RTC EEPROM