DS2432X 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS2432X

1k-Bit Protected 1-Wire™ EEPROM with SHA-1 Engine

Dallas Semiconductor -> Maxim Integrated 

PRELIMINARY

Memory and SHA Functions Flow Chart (continued) Figure 7

DS2432

From Figure 7

3rd Part

33h

N

Compute Next

Secret ?

Y

Bus Master TX

TA1 (T7:T0),

TA2 (T15:T8)

N

Valid Data

Y

Address ?

Bus Master

RX “1”s

Master

N

TX Reset ?

Y

To Figure 7

5th Part

Note: The master must first

load the scratchpad with a

partial secret of 8 bytes

Y

Write-

Protected ?

N

SHA Engine Computes Message *

Authentication Code of Current

Secret, Page Data, and 8 Byte

Partial Secret in Scratchpad

DS2432 Copies a Partial MAC *

to the Secret Register

DS2432 fills Scratchpad with AAh

DS2432 TX “0”

Y

Master

TX Reset ?

N

DS2432 TX “1”

N

Master

TX Reset ?

Y

To Figure 7

3rd Part

*

1-Wire idle high for power

From Figure 7

5th Part

11 of 30

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