Global Mixed-mode Technology Inc.
G781
G
D
E
H
I
J
K
M
A
B
C
F
L
tHIGH
tLOW
SMBCLK
SMBDATA
tHD:DAT
tBUF
tSU:STO
tSU:STA tHD:STA
tSU:DAT
Figure 4. SMBus Write Timing Diagram
A = start condition
H = LSB of data clocked into slave
I = slave pulls SMBDATA line low
J = acknowledge clocked into master
K = acknowledge clocked pulse
L = stop condition data executed by slave
M = new start condition
B = MSB of address clocked into slave
C = LSB of address clocked into slave
D = R/W bit clocked into slave
E = slave pulls SMBDATA line low
F = acknowledge bit clocked into master
G = MSB of data clocked into slave
A
B
G
J
K
C
D
E
F
H
I
tHIGH
tLOW
SMBCLK
SMBDATA
tBUF
tSU:STO
tSU:STA tHD:STA
tSU:DAT
Figure 5. SMBus Read Timing Diagram
A = start condition
G = MSB of data clocked into master
H = LSB of data clocked into master
I = acknowledge clocked pulse
J = stop condition
B = MSB of address clocked into slave
C = LSB of address clocked into slave
D = R/ W bit clocked into slave
E = slave pulls SMBDATA line low
F =acknowledge bit clocked into master
K= new start condition
Ver: 1.0
Oct 02, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
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ETC [ ETC ]
