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Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
Configuration Registers (R12h–R17h)
Operating Mode Register (R12h)
The Operating Mode register in the device (R12h, Table
19) contains 2 bits per port that set the port mode of
operation. Table 20 details how to set the mode of
operation for the device. On a power-up or after a reset
condition, if AUTO = 1, the Operating Mode register is
set to a default value of FFh. If AUTO = 0, the Operating
Mode register is set to 00h. Use software to program
the mode of operation. The software port specific reset
using RESET_P_ (R1Ah[3:0]), Table 27) does not affect
the mode register.
Table 19. Operating Mode Register
Disconnect Enable Register (R13h)
The Disconnect Enable register (R13h, Table 21) is
used to enable DC load disconnect detection. On
power-up or after a reset condition, if AUTO = 1, this
register is reset to a default value of F0h. If AUTO = 0,
it is set to 00h. Setting either ACD_EN_ (R13h[7:4]) or
DCD_EN _ (R13h[3:0]) to 1 enables the DC load discon-
nect detection feature on the corresponding port. To dis-
able DC load disconnect on a port, both the ACD_EN_
and DCD_EN_ bit for that port must be set low.
ADDRESS = 12h
SYMBOL BIT NO.
TYPE
DESCRIPTION
P4_M[1:0]
P3_M[1:0]
P2_M[1:0]
P1_M[1:0]
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
MODE[1:0] for port 4
MODE[1:0] for port 3
MODE[1:0] for port 2
MODE[1:0] for port 1
Table 20. Port Operating Mode Status
MODE[1:0]
00
01
10
11
Table 21. Disconnect E nable Register
DESCRIPTION
Shutdown
Manual
Semiautomatic
Auto (automatic)
ADDRESS = 13h
SYMBOL BIT NO.
TYPE
DESCRIPTION
ACD_EN4
ACD_EN3
ACD_EN2
ACD_EN1
DCD_EN4
DCD_EN3
DCD_EN2
DCD_EN1
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Enable DC disconnect detection on port 4
Enable DC disconnect detection on port 3
Enable DC disconnect detection on port 2
Enable DC disconnect detection on port 1
Enable DC disconnect detection on port 4
Enable DC disconnect detection on port 3
Enable DC disconnect detection on port 2
Enable DC disconnect detection on port 1
36
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