82598EB Datasheet, PDF (553/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - SMBus AC Specification
7.6.4 SMBus AC Specification
The 82598 meets the SMBus AC specifications as defined in the SMBus Specification version 2, section
3.1.1. Go to www.smbus.org/specs/ for more details.
The 82598 also supports 400 KHz SMBus (as a slave) and in this case meets the following table.
Table 7-16. SMBus Timing Parameters (Slave Mode)
Symbol
Parameter
Min
Typ
Max
Units
F_SMB
T_BUF
T_HD:STA
SMBus Frequency
Time between STOP and START
Hold time after Start Condition. After this period, the first
clock is generated.
10
1.44¹
0.48¹
400
kHz
μs
μs
T_SU:STA
Start Condition setup time
1.6¹
μs
T_SU:STO
Stop Condition setup time
1.76¹
μs
T_HD:DAT
Data hold time
0.32
μs
T_LOW
SMBCLK low time
0.8¹
μs
T_HIGH
SMBCLK high time
1.44¹
μs
1. The actual minimum requirement has to be less. Many of these are below the minimums specified by the SMBus specification.
Figure 7-6. SMBus Timing Diagram
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