DS2465 MAXIM [Maxim Integrated Products], DS2465 Datasheet - Page 27

• 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
Refer to the full data sheet for this information.
1-Wire Master Reset, e.g., After Power-Up
The 1-Wire Master Reset must be followed by a 1-Wire Reset Pulse command.
1-Wire Reset Pulse, e.g., to Begin or End 1-Wire Communication
Case A: 1-Wire Idle (1WB = 0), No Busy Polling to Read the Result
In the first cycle, the master sends the command; then the master waits (Idle) for the 1-Wire Reset to complete.
In the second cycle the DS2465 is accessed to read the result of the 1-Wire Reset from the 1-Wire Master Status
register.
Case B: 1-Wire Idle (1WB = 0), Busy Polling Until the 1-Wire Command is Completed, then Read the Result
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 Single Bit, e.g., to Generate a Single Time Slot 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 single-bit command.
S
S
S
S
S
AD,0
AD,0
AD,0
AD,0
AD,0
A
A
A
A
A
60h
60h
60h
60h
60h
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A
A
A
A
A
1WMR A Sr
1WRS
1WRS A
1WRS A\
1WSB
A
A
Repeat until the 1WB bit has changed to 0.
<byte>
Sr
P
P
AD,0
AD,1
(Idle)
A
A
A
S
P
<byte> A <byte>
60h
AD,1
(Idle)
S
I
2
AD,1
A 1WRS A
C Communication Examples (continued)
A
<byte>
A <byte>
A\
A\
P
P
A\
P
P
DS2465