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Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
General Registers (R1Bh–R1Fh)
ID Register (R1Bh)
The ID register (R1Bh, Table 28) keeps track of the
device ID number and revision. The device’s ID code
is stored in ID_CODE[4:0] (R1Bh[7:3]) and is 11010.
Contact the factory for the value of the revision code
stored in REV[2:0] (R1Bh[2:0]) that corresponds to the
device lot number.
Class 5 Enable Register (R1Ch)
The Class 5 Enable register (R1Ch, Table 29) is used
to enable the classification of Class 5 devices. On a
power-up or after a reset condition, if EN_CL5 = 0. this
Table 28. ID Register
register is set to a default value of 00h. If EN_CL5 = 1,
this register is set to 0Fh. Class 5 classification can be
enabled or disabled individually for each port in auto
mode by programming the corresponding bit directly
using the software.
Reserved Register (R1Dh)
Register R1Dh is at this time reserved. Writing to this
register is not recommended as it is internally con-
nected. If the software needs to do a large batch
write command using the address autoincrement func-
tion, write a code of 00h to this register to safely
autoincrement past it, and then continue the write
commands as normal.
ADDRESS = 1Bh
SYMBOL BIT NO.
7
6
TYPE
R
R
ID_CODE[4]
ID_CODE[3]
DESCRIPTION
ID_CODE
REV
5
4
3
2
1
0
R
R
R
R
R
R
ID_CODE[2]
ID_CODE[1]
ID_CODE[0]
REV[2]
REV[1]
REV[0]
Table 29. Class 5 Enable Register
ADDRESS = 1Ch
SYMBOL BIT NO.
TYPE
DESCRIPTION
Reserved
Reserved
Reserved
Reserved
CL5_EN4
CL5_EN3
CL5_EN2
CL5_EN1
7
6
5
4
3
2
1
0
—
—
—
—
R/W
R/W
R/W
R/W
Reserved
Reserved
Reserved
Reserved
Set to 1 to enable Class 5 classification on port 4
Set to 1 to enable Class 5 classification on port 3
Set to 1 to enable Class 5 classification on port 2
Set to 1 to enable Class 5 classification on port 1
40
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