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Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
Miscellaneous Configuration 1 Register (R17h)
The Miscellaneous Configuration 1 register (R17h,
Table 24) is used for several functions that do not
cleanly fit within one of the other configuration catego-
ries. On a power-up or after a reset condition, this regis-
ter is set to a default value of A0h. Therefore, by default,
INT_EN (R17h[7]) is set to 1 enabling INT functionality.
If INT_EN is set to 0, interrupt signals are disabled and
INT is set to a high-impedance state. If DET_CHG is
set to 1, detect events are only be generated when the
result is different from previous results (by default it is
set to 0).
Table 24. Miscellaneous Configuration 1 Register
ADDRESS = 17h
SYMBOL BIT NO.
TYPE
DESCRIPTION
INT_EN
DET_CHG
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
7
6
5
4
3
2
1
0
R/W
R/W
—
—
—
—
—
—
A logic-high enables INT functionality
A logic-high mandates detect events are only generated when the result changes
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Table 25. Detection/Classification Pushbutton Register
ADDRESS = 18h
SYMBOL BIT NO.
TYPE
DESCRIPTION
CLS_PB4
CLS_PB3
CLS_PB2
CLS_PB1
DET_PB4
DET_PB3
DET_PB2
DET_PB1
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Sets CLASS_EN4 in R14h to 1
Sets CLASS_EN3 in R14h to 1
Sets CLASS_EN2 in R14h to 1
Sets CLASS_EN1 in R14h to 1
Sets DET_EN4 in R14h to 1
Sets DET_EN3 in R14h to 1
Sets DET_EN2 in R14h to 1
Sets DET_EN1 in R14h to 1
38
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