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Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
Pushbutton Registers (R18h–R1Ah)
Detection/Classification Pushbutton Register (R18h)
The Detection/Classification Pushbutton register (R18h,
Table 25) is used as a pushbutton to set the corre-
sponding bits in the Detection and Classification Enable
register (R14h, Table 22). On a power-up or after a reset
condition, this register is set to a default value of 00h.
Power-Enable Pushbutton Register (R19h)
The Power-Enable Pushbutton register (R19h, Table
26) is used to manually power a port on or off. On a
power-up or after a reset condition, this register is
set to a default value of 00h. Setting PWR_OFF_
(R19h[7:4]) to 1 turns off power to the corresponding
port. PWR_OFF_ commands are ignored when the port
is already off and during shutdown. In manual mode,
setting PWR_ON_ (R19h[3:0]) to 1 turns on power to the
corresponding port. PWR_ON_ commands are ignored in
auto/semiautomatic mode, when the port is already
powered, and during shutdown. After the appropriate
command is executed (port power on or off), the register
resets back to 00h.
Table 26. Power-Enable Pushbutton Register
Global Pushbutton Register (R1Ah)
The Global Pushbutton register (R1Ah, Table 27) is used
to manually clear interrupts and to initiate global and
port resets. On a power-up or after a reset condition,
this register is set to a default value of 00h. Writing a 1
to INT_CLR (R1Ah[7]) clears all the event registers and
the corresponding interrupt bits in the Interrupt regis-
ter (R00h, Table 5). Writing a 1 to PIN_CLR (R1Ah[6])
clears the status of the INT output. RESET_IC (R1Ah[4])
causes a global software reset, after which all registers
are set back to default values (after reset condition
clears). Writing a 1 to RESET_P_ (R1Ah[3:0]) turns off
power to the corresponding port and resets only the port
status and event registers. If a port is powered when a
RESET_P_ command is initiated, the port mode is also
placed into SHDN, and the classification and detection
enable bits are cleared. After the appropriate command
is executed, the bits in the Global Pushbutton register all
reset to 0.
ADDRESS = 19h
SYMBOL BIT NO.
TYPE
DESCRIPTION
PWR_OFF4
PWR_OFF3
PWR_OFF2
PWR_OFF1
PWR_ON4
PWR_ON3
PWR_ON2
PWR_ON1
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Power off port 4
Power off port 3
Power off port 2
Power off port 1
Power on port 4
Power on port 3
Power on port 2
Power on port 1
Table 27. Global Pushbutton Register
ADDRESS = 1Ah
SYMBOL BIT NO.
TYPE
DESCRIPTION
INT_CLR
PIN_CLR
Reserved
RESET_IC
RESET_P4
RESET_P3
RESET_P2
RESET_P1
7
6
5
4
3
2
1
0
R/W
R/W
—
R/W
R/W
R/W
R/W
R/W
A logic-high clears all interrupts in event registers (R02h to R0bh)
A logic-high clears the INT pin
Reserved
A logic-high initiates a global device reset
A logic-high resets port 4
A logic-high resets port 3
A logic-high resets port 2
A logic-high resets port 1
39
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