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AT45DB081B-CI

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33
16
AT45DB081B
2225F–DFLSH–5/03
Write Operations The following block diagram and waveforms illustrate the various write sequences
available.
Main Memory Page Program through Buffers
Buffer Write
Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)
FLASH MEMORY ARRAY
PAGE (264 BYTES)
BUFFER 2 (264 BYTES)BUFFER 1 (264 BYTES)
I/O INTERFACE
SI
BUFFER 1 TO
MAIN MEMORY
PAGE PROGRAM
MAIN MEMORY
PAGE PROGRAM
THROUGH BUFFER 2
BUFFER 2 TO
MAIN MEMORY
PAGE PROGRAM
MAIN MEMORY PAGE
PROGRAM THROUGH
BUFFER 1
BUFFER 1
WRITE
BUFFER 2
WRITE
SI
CMD n n+1 Last Byte
· Completes writing into selected buffer
· Starts self-timed erase/program operation
CS
rrr, PA11-7 PA6-0, BFA8 BFA7-0
SI
CMD X
X···X, BFA8
BFA7-0
n
n+1
Last Byte
· Completes writing into selected buffer
CS
SI
CMD rrr, PA11-7 PA6-0, X
CS
Starts self-timed erase/program operation
X
Each transition represents
8 bits and 8 clock c
y
cles
n = 1st byte read
n+1 = 2nd byte read
17
AT45DB081B
2225F–DFLSH–5/03
Read Operations The following block diagram and waveforms illustrate the various read sequences
available.
Main Memory Page Read
Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
Buffer Read
FLASH MEMORY ARRAY
PAGE (264 BYTES)
BUFFER 2 (264 BYTES)BUFFER 1 (264 BYTES)
I/O INTERFACE
MAIN MEMORY
PAGE TO
BUFFER 1
MAIN MEMORY
PAGE TO
BUFFER 2
MAIN MEMORY
PAGE READ
BUFFER 1
READ
BUFFER 2
READ
SO
SI
CMD
rrr, PA11-7
PA6-0, BA8
BA7-0 X
XXX
CS
n n+1
SO
SI
CMD
rrr, PA11-7 PA6-0, X X
Starts reading page data into buffer
CS
SO
SI
CMD
X
X···X, BFA8
BFA7-0
CS
n n+1
SO
X
Each transition represents
8 bits and 8 clock c
y
cles
n = 1st byte read
n+1 = 2nd byte read
18
AT45DB081B
2225F–DFLSH–5/03
Detailed Bit-level Read Timing – Inactive Clock Polarity Low
Continuous Array Read (Opcode: 68H)
Main Memory Page Read (Opcode: 52H)
SI
0
1XX
CS
SO
SCK
12 63 64 65 66 67 68
HIGH-IMPEDANCE
D
7
D
6
D
5
D
2
D
1
D
0
D
7
D
6
D
5
DATA OUT
BIT 0
OF
PAGE n+1
BIT 2111
OF
PAGE n
LSB MSB
t
SU
t
V
SI
0
1
0
10
XXX
CS
SO
SCK
12345 60 61 62 63 64 65 66 67
XX
HIGH-IMPEDANCE
D
7
D
6
D
5
DATA OUT
COMMAND OPCODE
MSB
t
SU
t
V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33

AT45DB081B-CI

Mfr. #:
Buy AT45DB081B-CI
Manufacturer:
Microchip Technology / Atmel
Description:
NOR Flash 8M bit
Lifecycle:
New from this manufacturer.
Delivery:
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