DS2407 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2407

Dual Addressable Switch Plus 1K–Bit Memory

Dallas Semiconductor -> Maxim Integrated 

DS2407

MEMORY FUNCTION FLOW CHART Figure 6

MASTER TX MEMORY

FUNCTION COMMAND

F0h

READ

N

MEMORY

?

Y

BUS MASTER TX

TA1 (T7:T0)

BUS MASTER TX

TA2 (T15:T8)

DS2407 SETS MEMORY

ADDRESS = (T15:T0)

BUS MASTER RX

DATA FROM

DATA MEMORY

Y

BUS MASTER

TX RESET

?

DS2407 INCREMENTS

N

ADDRESS COUNTER

N

END

OF DATA

MEMORY

?

Y

Y

BUS MASTER

TX RESET

?

N

BUS MASTER RX

CRC16 OF COMMAND,

ADDRESS, DATA

LEGEND:

Y

BUS MASTER

TX RESET

?

N

BUS MASTER

RX 1’S

A5h

EXTENDED

N

READ MEMORY

?

Y

BUS MASTER TX

TA1 (T7:T0)

BUS MASTER TX

TA2 (T15:T8)

TO FIGURE 6

SECOND PART

DS2407 SETS MEMORY

ADDRESS = (T15:T0)

BUS MASTER RX

REDIR. BYTE

BUS MASTER RX CRC16 OF COMMAND,

ADDRESS, REDIR. BYTE

(1ST PASS)

CRC16 OF REDIR. BYTE (SUBSEQUENT

PASSES)

BUS MASTER

TX RESET

N

CRC

CORRECT

?

Y

BUS MASTER RX

DATA FROM

DATA MEMORY

Y

BUS MASTER

TX RESET

?

N

DS2407 INCREMENTS

ADDRESS COUNTER

END OF

N

PAGE

?

Y

BUS MASTER RX CRC16

OF PRECEDING PAGE OF DATA

BUS MASTER

TX RESET

N

CRC

CORRECT

?

Y

END OF

DATA

MEMORY

?

Y

Y

DS2407 INCREMENTS

ADDRESS COUNTER

N

DECISION MADE

BY THE MASTER

DECISION MADE

BY DS2407

DS2407 TX

PRESENCE PULSE

Y

BUS MASTER

TX RESET

?

N

BUS MASTER

RX 1’S

012099 11/31

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