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DS2407 Datasheet(PDF) 12 Page - Dallas Semiconductor

Part # DS2407
Description  Dual Addressable Switch Plus 1K.Bit Memory
PDF  31 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS2407 Datasheet(HTML) 12 Page - Dallas Semiconductor

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 12 / 31 page
background image
0Fh
WRITE
MEMORY
?
N
BUS MASTER TX
TA1 (T7:T0)
BUS MASTER TX
TA2 (T15:T8)
BUS MASTER RX CRC16
OF COMMAND, ADDRESS,
DATA (1ST PASS)
CRC16 OF ADDRESS, DATA
(SUBSEQUENT PASSES)
CRC
CORRECT
?
Y
BUS MASTER TX
DATA BYTE (D7:D0)
BUS MASTER TX
PROGRAM PULSE
BUS MASTER RX
BYTE FROM EPROM
END OF
DATA MEMORY
?
DS2407 INCREMENTS
ADDRESS COUNTER
DS2407 LOADS NEW
ADDRESS INTO CRC
GENERATOR
55h
WRITE
STATUS
?
BUS MASTER TX
TA1 (T7:T0)
BUS MASTER TX
TA2 (T15:T8)
CRC
CORRECT
?
BUS MASTER TX
DATA BYTE (D7:D0)
BUS MASTER TX
PROGRAM PULSE
BUS MASTER RX
BYTE FROM EPROM
BUS MASTER
TX RESET
N
Y
Y
N
N
Y
N
Y
Y
EPROM BYTE
CORRECT
?
ADDRESS
<7
?
DS2407 INCREMENTS
ADDRESS COUNTER
DS2407 LOADS NEW
ADDRESS INTO CRC
GENERATOR
Y
EPROM BYTE
CORRECT
?
BUS MASTER RX CRC16
OF COMMAND, ADDRESS,
DATA (1ST PASS)
CRC16 OF ADDRESS, DATA
(SUBSEQUENT PASSES)
N
DS2407 COPIES
SCRATCHPAD
TO STATUS EPROM
DS2407 COPIES
SCRATCHPAD
TO DATA EPROM
Y
BUS MASTER TX
8 READ TIME SLOTS
OR PROGRAM PULSE
DS2407 COPIES
SCRATCHPAD TO
VOLATILE STATUS
BUS MASTER RX BYTE
FROM VOLATILE
STATUS
DS2407 TX
PRESENCE PULSE
N
N
LEGEND:
DECISION MADE
BY THE MASTER
DECISION MADE
BY DS2407
TO FIGURE 6
SECOND PART
FROM FIGURE 6
FIRST PART
DS2407
012099 12/31
MEMORY FUNCTION FLOW CHART Figure 6 (cont’d)



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