HP Workstation x1000 hp workstation x1000 - technical reference guide - Page 64

SMBus

Page 64 highlights

Figure 2-12 system board the input/output controller hub 2 (82801BA) SMBus The SMBus is a subset of the I2C bus. It is a two-wired serial bus that runs at a maximum speed of 100KHz. The SMBus monitors some of the system board's hardware functions (for example, voltage levels, temperature, fan speed, memory presence, and type), both at system boot and during normal run-time. The SMBus controller, located in the ICH2, controls the SMBus. Devices on the SMBus Intel Pentium 4 Processor System Bus I845 Memory Controller Hub (MCH) HUB LINK 8 (233MB/s data transfer rate) I/IO/OCCoonntrolllleerrHHubub (IC(ICHH22))8822880011BAAA IDE Controller 4 x USB Controller PCI bridge AD1885 codec DMA Controller SMBus Controller SMBus SMBus Devices 64 Chapter 2

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system board
the input/output controller hub 2 (82801BA)
Chapter 2
64
SMBus
The SMBus is a subset of the I2C bus. It is a two-wired serial bus that
runs at a maximum speed of 100KHz. The SMBus monitors some of the
system
board’s
hardware
functions
(for
example,
voltage
levels,
temperature, fan speed, memory presence, and type), both at system boot
and during normal run-time. The SMBus controller, located in the ICH2,
controls the SMBus.
Figure 2-12
Devices on the SMBus
I845 Memory
Controller
Hub (MCH)
SMBus
Devices
SMBus
4 x USB
Controller
System Bus
HUB LINK 8
(233MB/s data
transfer rate)
SMBus
Controller
Intel Pentium 4
Processor
I/O Controller Hub
(ICH2) 82801BA
PCI bridge
IDE
Controller
DMA
Controller
AD1885
codec