Rainbow-electronics DS1957 Manual de usuario descargar pdf (Pagina 8)

DS1957

8 of 25

DATA TRANSFER AND CONTROL FUNCTION FLOW CHART Figure 4 (cont’d)

2DH

WRITE I/O

BUFFER

?

N

BUS MASTER TX

LENGTH BYTE

BUS MASTER TX

DATA BYTE

LAST BYTE

?

DS1957 INCREMENTS

BUFFER ADDRESS

BUS MASTER RX

CRC 16 OF COMMAND,

LENGTH BYTE, DATA

CRC CORRECT

?

FROM DATA TRANSFER

AND CONTROL

FUNCTION

Y

Y

N

1)

1)

N

FLOW CHART PART 3

1)

Y

FROM DATA TRANSFER AND

CONTROL FUNCTION

FLOW CHART PART 1

TO DATA TRANSFER AND

CONTROL FUNCTION

FLOW CHART PART 3

TO ROM FUNCTIONS

FLOW CHART

BUS MASTER TX 9DB3H

RELEASE SEQUENCE

COMMAND

UNDERSTOOD

?

BUS MASTER

TX RESET

?

BUS MASTER

RX 0’s

BUS MASTER

RX 1’s

22H

READ I/O

BUFFER

?

N

BUS MASTER TX

LENGTH BYTE

BUS MASTER RX

DATA BYTE

LAST BYTE

?

DS1957 DECREMENTS

BUFFER ADDRESS

BUS MASTER RX

CRC 16 OF COMMAND,

LENGTH BYTE, DATA

CRC CORRECT

?

Y

Y

N

1)

1)

1)

Y

BUS MASTER TX 624CH

RELEASE SEQUENCE

BUS MASTER

RX 0’s

BUS MASTER

RX 1’s

BUS MASTER

TX RESET

?

1)

1)

N

N

Y

Y

1)

1)

1)

1)

N

N

N

2)

2)

2)

Y

Y

Y

FROM DATA TRANSFER

AND CONTROL

FUNCTION

FLOW CHART PART 1

1), 2) SEE PREVIOUS OR NEXT PAGE

N

COMMAND

UNDERSTOOD

?

BUS MASTER

TX RESET

?

BUS MASTER

TX RESET

?

2)

Y

BUS MASTER

RX 1’s

1)

N

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