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Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
ACKNOWLEDGE FROM THE MAX5980
CONTROL BYTE STORED ON STOP CONDITION
CB7 CB6 CB5 CB4 CB3 CB2 CB1 CB0
D7
D6
D5
D4
D3
D2
D1
D0
ACKNOWLEDGE FROM THE MAX5980
S
SLAVE ADDRESS
0
ACK
CONTROL BYTE
ACK
DATA BYTE (1 BYTE)
ACK
P
R/W
WORD ADDRESS AUTOINCREMENT
Figure 11. Write Format, Control, and Single Data Byte Written
ACKNOWLEDGE FROM THE MAX5980
CONTROL BYTE STORED ON STOP CONDITION
CB7 CB6 CB5 CB4 CB3 CB2 CB1 CB0
D7
D6
D5
D4
D3
D2
D1
D0
ACKNOWLEDGE FROM THE MAX5980
S
SLAVE ADDRESS
0
ACK
CONTROL BYTE
ACK
DATA BYTE (n BYTES)
ACK
P
R/W
WORD ADDRESS AUTOINCREMENT
REPEAT FOR n BYTES
Figure 12. Write Format, Control, and n Data Bytes Written
ACKNOWLEDGE FROM THE MAX5980
ACKNOWLEDGE/NACK FROM THE MASTER
CONTROL BYTE STORED ON STOP CONDITION
CB7 CB6 CB5 CB4 CB3 CB2 CB1 CB0
D7
D6
D5
D4
D3
D2
D1
D0
ACKNOWLEDGE FROM THE MAX5980
S
SLAVE ADDRESS
1
ACK
CONTROL BYTE
ACK
DATA BYTE (n BYTES)
ACK/ P
NACK (NACK)
R/W
WORD ADDRESS AUTOINCREMENT
REPEAT FOR n BYTES (ACK)
Figure 13. Read Format, Control, and n Data Bytes Read
Message Format for Reading
A read command for the device comprises the device
slave address transmission with the R/ W bit set to 1, fol-
lowed by at least 1 byte of information. As with a write
command, the first byte of information is the command
byte. The device then reads using the internally stored
command byte as an address pointer, the same way the
a write. This pointer autoincrements after reading each
data byte using the same rules as for a write, though the
master now sends the acknowledge bit after each read
receipt (Figure 13). When performing read-after-write
verification, remember to reset the command byte’s
address because the stored control byte address auto-
increments after the write.
stored command byte is used as an address pointer for
25
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