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

2nd Part

5Ah

N

Load First

Secret ?

Y

Bus Master TX

TA1 (T7:T0), TA2 (T15:T8)

and E/S Byte

Note: The 8-byte secret

must first be written to

the scratchpad.

To Figure 7

4th Part

Auth. Code

Y

Match ?

N

N

Address of

Y

Secret ?

Y

Write-

Protected ?

N

AA = 1

DS2432 copies Scratch- *

pad Data to Secret

DS2432 TX “0”

Bus Master

RX “1”s

Master

N

TX Reset ?

Y

Y

Master

TX Reset ?

N

DS2432 TX “1”

Master

N

TX Reset ?

Y

To Figure 7

2nd Part

*

1-Wire idle high for power

From Figure 7

4th Part

10 of 30

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