Rainbow-electronics DS2432 Manual de usuario descargar pdf (Pagina 13)

PRELIMINARY DS2432

13 of 30

Memory and SHA Functions Flow Chart (continued) Figure 7

A5h

Read Auth.

Page ?

Bus Master TX

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

Address

< 80h ?

Bus Master

RX “1”s

Master

TX Reset ?

DS2432 sets Memory

Address = (T15:T0)

Master

TX Reset ?

Bus Master RX CRC16

of Command, Address,

Data

and FFh B

DS2432

Increments

Address

Counter

Master

TX Reset ?

Master RX Data Byte

From Memory Address

End

Of Page ?

Master RX

one byte FFh

Master

TX Reset ?

Master

TX Reset ?

DS2432 TX “1”

DS2432 TX “0”

SHA Engine Computes

Message Authentication

Code of Secret, Data of

Selected Page, Device

Registration Number and

3-Byte Challenge

Bus Master RX 160-Bit

Message Auth. Code

Bus Master RX CRC16 of

Message Auth. Code

1-Wire idle high for power

Note: Three bytes of the

scratchpad contents are taken

as a challenge to the DS2432.

The master may specify the

challenge or accept the current

scratchpad contents instead.

From Figure 7

Part

To Figure 7

Part

To Figure 7

Part

From Figure 7

Part

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 29 30

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Rainbow-electronics DS2432 Manual de usuario Pagina 13

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