DS1994 Просмотр технического описания (PDF) - Maxim Integrated

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производитель

DS1994

4Kb Plus Time Memory iButton®

Maxim Integrated 

Figure 6. MEMORY FUNCTIONS FLOWCHART (continued)

DS1994

From Figure 6

C5o5pHy

N

First Part

Scratchpad

?Y

Bus Master TX

TA1 (T7:T0)

Bus Master TX

TA2 (T15:T8)

Bus Master TX

E/S Byte

Auth.

N

Code Match

?

Y

AA = 1

DS1994 TX "1"s

DS1994 Copies

Scratchpad Data

To Memory

DS1994 TX "0"s

N

Bus Master

TX Reset

?

Y

F0H

Y

Read Memory

N?

Bus Master TX

TA1 (T7:T0)

Bus Master TX

TA2 (T15:T8)

DS1994 sets Memory

Address = (T15:T0)

Master RX Data

Byte From

Memory Address

DS1994

Increments

Address Counter

Y

Bus Master

TX Reset

?N

Bus Master N

TX Reset

?

Y

N Memory

Address

= 21Dh ?

Y

Bus Master

RX "1"s

To Figure 6

First Part

11 of 23

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