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IXF1104 4-Port Gigabit Ethernet Media Access Controller
146 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
7.7 Optical Module and I
2
C AC Timing Specification
7.7.1 I
2
C Interface Timing
Figure 45 and Figure 46 illustrate bus timing and write cycle, and Table 53 shows the I
2
C Interface
AC timing characteristics.
Figure 45. Bus Timing Diagram
Figure 46. Write Cycle Diagram
Table 53. I
2
C AC Timing Characteristics (Sheet 1 of 2)
Symbol Parameter Min Max Units
f
SCL
Clock frequency, SCL - 100 kHz
t
LOW
Clock pulse width low 4.7 µs
t
HIGH
Clock pulse width High 4.0 µs
t
I
Noise suppression 100 µs
t
AA
Clock low to data valid out 0.1 4.5 µs
t
BUF
Time the bus must be free before a new transmission starts 4.7 - µs
t
HD.STA
Start hold time 4.0 - µs
I
2
C_Clk
I
2
C_Data Out
t
DH
t
SV.SAT
t
AA
t
BUF
t
HD.STA
t
HIGH
t
R
t
SU.STO
t
SU.DAT
t
HD.DAT
t
LOW
t
F
I
2
C_Data In
t
LOW
ACK
8th
BIT
WORD n
I
2
C_Clk
I
2
C_Data
STOP
CONDITION
START
CONDITION
t
WR
(1)