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DS25LV02: Low-Voltage 1024-Bit EPROM
Figure 8. Operational Flow Chart (Continued)
MEMORY
COMMANDS 3
0Fh
WRITE
MEMORY
NO
55h
WRITE
STATUS
NO
?
YES
BUS MASTER Tx
TA1 (T7:T0)
BUS MASTER Tx
TA2 (T15:T8)
BUS MASTER Tx
DATA BYTE (D7:D0)
BUS MASTER Rx 8-BIT CRC OF
COMMAND, ADDRESS, AND DATA
(1 st PASS)
CRC OF ADDRESS AND DATA
(SUBSEQUENT PASSES)
?
YES
BUS MASTER Tx
TA1 (T7:T0)
BUS MASTER Tx
TA2 (T15:T8)
BUS MASTER Tx
DATA BYTE (D7:D0)
BUS MASTER Rx CRC16 OF
COMMAND, ADDRESS, AND DATA
(1 st PASS)
CRC16 OF ADDRESS AND DATA
(SUBSEQUENT PASSES)
NO
CRC
CORRECT
?
NO
CRC
CORRECT
?
BUS MASTER
TX RESET
YES
BUS MASTER Tx
PROGRAM PULSE
DS25LV02 COPIES
NO
SCRATCHPAD TO DATA EPROM
BUS MASTER Rx BYTE
FROM EPROM
YES
BUS MASTER Tx
PROGRAM PULSE
DS25LV02 COPIES SCRATCHPAD
NO
TO STATUS EPROM
BUS MASTER Rx BYTE
FROM EPROM
NO
YES
EPROM BYTE
= CORRECT
?
YES
END OF
DATA
MEMORY
NO
YES
EPROM BYTE
= CORRECT
?
YES
END OF
STATUS
MEMORY
?
NO
DS25LV02 INCREMENTS
ADDRESS COUNTER
?
NO
DS25LV02 INCREMENTS
ADDRESS COUNTER
BUS MASTER
TX RESET
DS25LV02 LOADS LSB OF
NEW ADDRESS INTO CRC
GENERATOR
BUS MASTER
TX RESET
DS25LV02 LOADS LSB OF
NEW ADDRESS INTO CRC
GENERATOR
DS25LV02 Tx
PRESENCE PULSE
GO TO START
17 of 17
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