Rainbow-electronics DS2431 Instrukcja Użytkownika Pobierz pdf (Strona 9)

DS2431: 1024-Bit, 1-Wire EEPROM

9 of 23

Figure 7-1. Memory Function Flow Chart

0Fh

Write Scratch-

pad ?

Bus Master TX

TA1

(

T7:T0

),

TA2

(

T15:T8

)

Y

N

To Figure 7

2

nd

Part

From Figure 7

2

nd

Part

Bus Master TX Memory

Function Command

To ROM Functions

Flow Chart

(

Fi

g

ure 9

)

From ROM Functions

Flow Chart

(

Fi

g

ure 9

)

Applies only if the

memory area is not

protected.

If

write-protected

, then

the DS2431 copies the

data byte from the tar-

get address into the SP.

If in

EPROM mode

,

then the DS2431 loads

the bitwise logical AND

of the transmitted byte

and the data byte from

the targeted address

into the SP.

Master

TX Reset ?

Master TX Data Byte

To Scratch

p

ad

DS2431 sets

Sets PF = 1

Clears AA = 0

Sets E2:E0 = T2:T0

DS2431

Increments

E2:E0

Master

TX Reset ?

Y

DS2431 TX CRC16

of Command, Address,

Data Bytes as they were

sent by the bus master

N

Y

PF = 0

N

Y

E2:E0

= 7 ?

Bus Master

RX “1”s

N

N

Y

T2:T0

= 0 ?

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