Signal Description

2.8SMBus Interface

Table 8.

SMBus Interface Pins

 

 

 

 

 

 

 

Signal

I/O

 

 

Description

 

 

 

 

 

SMBCLK

I/OD

SMBus Clock: This signal must be pulled to 3.3 V through an 8.2 K

resistor.

 

 

 

 

SMBDAT

I/OD

SMBus Data: This signal must be pulled to 3.3 V through an 8.2 K

resistor.

 

 

 

 

 

SMBus Addressing Straps: These straps set the SMBus address for the 41210 Bridge. The address

 

 

is determined as indicated below:

 

 

 

Bit[7]

1

 

 

 

Bit[6]

1

 

SMBUS[5]

 

Bit[5]

SMBUS[5]

 

I

Bit[4]

0

 

SMBUS[3:1]

 

 

Bit[3]

SMBUS[3]

 

 

 

 

 

 

Bit[2]

SMBUS[2]

 

 

 

Bit[1]

SMBUS[1]

 

 

 

These signals (bits[5], [3:1]) must be pulled up to 3.3 V or down to ground. Sampled at the rising edge

 

 

of PERST#.

 

 

 

 

 

 

 

Total

6

 

 

 

 

 

 

 

 

 

 

Intel® 41210 Serial to Parallel PCI Bridge Developer’s Manual

21

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Image 21
Intel 41210 manual SMBus Interface Pins