Intel® 41210 Serial to Parallel PCI Bridge Developer’s Manual 55
System Management Bus Interface
System Management Bus Interface 8
The SMBus interface allows the Intel® 41210 Serial to Parallel PCI Bridge (called hereafter the
41210 Bridge or 41210) to serve as a slave device residing on the SMBus for system management
functions and provides for full access to the configuration registers in each function. The SMBus
implementation has the following characteristics:
•Is based on the System Management Bus Specification, Revision 2.0 (SMBus)
•Allows for slave-mode operation only
•Provides full read/write access to internal configuration and memory spaces
The SMBus address is set up on PERST# by sampling the SMBUS pins. When the pins are
sampled, the resulting address is assigned as shown in Table 25:
Table 25. SMBus Address Assignments
Bit Value
71
61
5SMBUS[5]
40
3SMBUS[3]
2SMBUS[2]
1SMBUS[1]