DS2465 MAXIM [Maxim Integrated Products], DS2465 Datasheet - Page 28

• Manufacturer Part Number: DS2465
• Description: SHA-256 Coprocessor with 1-Wire Master Function
• Manufacturer: MAXIM [Maxim Integrated Products]

SHA-256 Coprocessor with 1-Wire Master Function
Case B: 1-Wire Idle (1WB = 0), Busy Polling Until the 1-Wire Command is Completed
When 1WB has changed from 1 to 0, the 1-Wire Master Status register holds the valid result of the 1-Wire Single
Bit command.
Case C: 1-Wire Busy (1WB = 1)
The master should stop and restart as soon as the DS2465 does not acknowledge the command code.
1-Wire Write Byte, e.g., to Send a Command Code to the 1-Wire Line
Case A: 1-Wire idle (1WB = 0), No Busy Polling
33h is the valid 1-Wire ROM function command for Read ROM. The idle time is needed for the 1-Wire function to
complete. There is no data read back from the 1-Wire line with this command.
Case B: 1-Wire Idle (1WB = 0), Busy Polling Until the 1-Wire Command is Completed.
When 1WB has changed from 1 to 0, the 1-Wire Write Byte command is completed.
Case C: 1-Wire Busy (1WB = 1)
The master should stop and restart as soon as the DS2465 does not acknowledge the command code.
1-Wire Read Byte, e.g., to Read a Byte from the 1-Wire Line
Case A: 1-Wire Idle (1WB = 0), No Busy Polling, Set read address before Idle Time
The read address is set to the 1-Wire Read Data register while the 1-Wire Read Byte command is still in progress.
Then, after the 1-Wire function is completed, the device is accessed to read the data byte that was obtained from
the 1-Wire line.
S
S
S
S
S
S
AD,0
AD,0
AD,0
AD,0
AD,0
AD,0
A
A
A
A
A
A
60h
60h
60h
60h
60h
60h
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A
A
A
A
A
A
1WWB
1WWB A
1WWB A\
1WRB
1WSB A
1WSB A\
A
A
<byte>
Sr
33h
33h
P
P
AD,0
A P
A
A
Sr AD,1
A
Sr
(Idle)
62h
AD,1
I
2
A <byte>
A
(Idle)
C Communication Examples (continued)
Repeat until the
changed to 0.
A <byte>
1WB bit has
Repeat until the
P
changed to 0.
1WB bit has
S
AD,1
A <byte>
A <byte>
A <byte>
A\
A\
P
A\
P
P
DS2465