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Chapter 3
System Management Bus (SMBus)
The E6XXT chip contains a host SMBus port. The host port allows the CPU access to the SMBus slaves
through header, J24. The SMBus slaves include the Gigatbit Ethernet Controller and the CPU Temperature
Monitor.
Table 3-15
lists the device names and corresponding reserved binary addresses on the SMBus.
Table 3-16
lists the SMBus pin signals on 5 pins, 1 row, 0.079" (2mm) pitch.
Table 3-15. SMBus Reserved Addresses
Component
CPU Temperature Monitor
Gigabit Ethernet Controller
Table 3-16. SMBus Pin Signals (J24)
Pin #
Signal
1
SMB_CLK
2
GND
3
SMB_DATA
4
VSM
5
SMB_ALERT*
Note: The shaded table cells denote power or ground. The * symbol indicates the signal is Active Low.
CAN Bus Interface
The CAN controller resides in the PCH and performs communication in accordance with the Bosch CAN
Protocol version 2.0B Active (standard and extended formats.) The CAN transceiver connects the CAN
controller to the CAN bus, and transmits and receives CAN signals to and from the CAN header (J4). The
CAN interface delivers CAN signals used for automotive, industrial automation, and medical scanning and
imaging applications. The following list describes some of the features of the CAN Bus Interface.
+/- 12 kV ESD protection
♦
Low-current Standby mode with bus wake up: 5 A typical
♦
Bus-fault protection of -27V to 40V
♦
Over-temperature shutdown
♦
Table 3-14
defines the pin signals of the CAN bus interface, which provides a 4-pin, single-row header with
0.079" (2mm) pitch.
Table 3-17. CAN Interface Pin Signals (J4)
Pin #
Signal
1
CAN_L
2
CAN_H
3
+5V
4
GND
Note: The shaded table cells denote power or ground.
CoreModule 720
Address (Binary)
1001,100x
1100,001x
Description
SMBus Clock
Ground
SMBus Data
+3.3V standby voltage
SMBus Alert
Description
Dominant Low
Dominant High
+5 volts power
Ground
Reference Manual
b
b
μ
Hardware
31
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