DS2465 MAXIM [Maxim Integrated Products], DS2465 Datasheet - Page 29

• 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
Poll the Status register until the 1WB bit has changed from 1 to 0. Then set the read address to the 1-Wire Read
Data register and access the device again to read the data byte that was obtained from the 1-Wire line.
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 Triplet, e.g., to Perform a Search ROM Function on the 1-Wire Line
Case A: 1-Wire Idle (1WB = 0), No Busy Polling
The idle time is needed for the 1-Wire function to complete. Then access the device in read mode to get the result
from the 1-Wire Triplet 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 Master Status register holds the valid result of the 1-Wire Triplet
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.
S
S
S
S
S
AD,0
AD,0
AD,0
AD,0
AD,0
A
A
A
A
A
Sr AD,0
60h
60h
60h
60h
60h
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A
A
A
A
A
A
1WT
1WT A <byte>
1WT
1WRB
1WRB
62h
A\ P
A
A
A\
A
<byte>
Sr AD,1
Sr AD,1
P
A
A
A <byte>
Sr AD,1
P
A <byte>
Repeat until the
changed to 0.
1WB bit has
(Idle)
S
AD,1
I
2
C Communication Examples (continued)
A <byte>
A\
Repeat until the
changed to 0.
A <byte>
1WB bit has
A <byte>
P
A
A\
<byte>
A\
P
A\
P
DS2465