Intel E3815 FH8065301567411 Data Sheet
Product codes
FH8065301567411
PCU – System Management Bus (SMBus)
Intel
®
Atom™ Processor E3800 Product Family
Datasheet
4429
33
PCU – System Management Bus
(SMBus)
The SoC provides a System Management Bus (SMBus) 2.0 host controller. The host
controller provides a mechanism for the processor to initiate communications with
SMBus peripherals (slaves). The SoC is also capable of operating in a mode in which it
can communicate with I
controller provides a mechanism for the processor to initiate communications with
SMBus peripherals (slaves). The SoC is also capable of operating in a mode in which it
can communicate with I
2
C compatible devices.
The SoC can perform SMBus messages with packet error checking (PEC) enabled or
disabled. The actual PEC calculation and checking can be performed in either hardware
or software.
disabled. The actual PEC calculation and checking can be performed in either hardware
or software.
The SMBus Address Resolution Protocol (ARP) is supported by using the existing host
controller commands through software, except for the Host Notify command (which is
actually a received message).
controller commands through software, except for the Host Notify command (which is
actually a received message).
The programming model of the host controller is combined into two portions: a PCI
configuration portion, and a system I/O mapped portion. All static configuration, such
as the I/O base address, is done using the PCI configuration space. Real-time
programming of the Host interface is done in system I/O space.
configuration portion, and a system I/O mapped portion. All static configuration, such
as the I/O base address, is done using the PCI configuration space. Real-time
programming of the Host interface is done in system I/O space.
33.1
Signal Descriptions
Please see
for additional details.
The signal description table has the following headings:
•
Signal Name: The name of the signal/pin
•
Direction: The buffer direction can be either input, output, or I/O (bidirectional)
•
Platform Power: The reference power plane.
•
Description: A brief explanation of the signal’s function
I
O
I
O
I
O
I
O
I
O
I
O
I
O
O
Platform Control Unit
UART
SMB
iLB
SPI
PM
C
C