SMD1102 / 1103 / 1113
3FF
3FF
Once the SMBALERT# signal has been asserted it must be
reset before further communication with the device, with
the exception of the SMBALERT# response sequence.
Resetting the SMBALERT# is accomplished by performing
a read operation.
Solid line
indicates
ALERT
REGION
ALERT
REGION
alert set if
conv = limit
Dashed line
indicates
alert NOT set
if conv = limit
ALERT
REGION
ALERT
REGION
000
3FF
000
3FF
Figure 10 shows the SMBALERT# signal being reset by a
Read operation.
"00"
"01"
Monitor
Option Bits
x
x
Lower
Upper
Note: a Read operation that is used to reset the
SMBALERT# will not return valid data.
Upper limit
Lower limit
ALERT
REGION
ALERT
REGION
000
000
"10"
"11"
2033 Fig08
Figure 8. Four Alert Conditions
SMBALERT
#
SCL
SDA
0
0
0
1
1
0
0
R/M
1
0
0
1
0
CH1 CH0
S
T
A
R
T
A
C
K
S
T
O
P
N
A
C
K
Device Type
Identifier
Alert Response
Address
Offending Channel
Address
2033 Fig09
Figure 9. SMBALERT# Response Sequence
SMBALERT#
SCL
SDA
1
0
0
1
0
CH1 CH0 R/M
S
A
C
K
N
S
T
O
P
T
A
R
T
A
C
K
2033 Fig10
Figure 10. Resetting SMBALERT
#
SUMMIT MICROELECTRONICS, Inc.
2033 8.1 10/04/01
9
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
