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AT45DB642-TC

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19
AT45DB642
1638F–DFLSH–09/02
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 (1056 BYTES)
BUFFER 2 (1056 BYTES)BUFFER 1 (1056 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
I/O7 - I/O0
SI or I/O7 - I/O0
(INPUT)
CMD n n+1 Last Byte
· Completes writing into selected buffer
· Starts self-timed erase/program operation
CS
PA12-5 PA4-0, BFA10-8
BFA7-0
SI or I/O7 - I/O0
(INPUT)
CMD
X
X···X, BFA10-8
BFA7-0
n
n+1
Last Byte
· Completes writing into selected buffer
CS
SI or I/O7 - I/O0
(INPUT)
CMD
PA12-5
PA4-0, XXX
CS
Starts self-timed erase/program operation
X···X
Each transition
represents 8 bits
n=1stbyteread
n+1 = 2nd byte read
20
AT45DB642
1638F–DFLSH–09/02
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 (1056 BYTES)
BUFFER 2 (1056 BYTES)BUFFER 1 (1056 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
I/O7 - I/O0
SI or I/O7 - I/O0
(INPUT)
CMD
PA12-5
PA4-0, BA10-8
BA7-0 X
X
CS
nn+1
SO or I/O7 - I/O0
(OUTPUT)
SI or I/O7 - I/O0
(INPUT)
CMD
PA12-5 PA4-0, XXX X
Starts reading page data into buffer
CS
SO or I/O7 - I/O0
(OUTPUT)
SI or I/O7 - I/O0
(INPUT)
CMD
X
BFA10-8
BFA7-0
CS
n n+1
SO or I/O7 - I/O0
(OUTPUT)
X
Each transition
represents 8 bits
n=1stbyteread
n+1 = 2nd byte read
21
AT45DB642
1638F–DFLSH–09/02
Detailed Bit-level Read Timing – Inactive Clock Polarity Low
Continuous Array Read (Opcode: 68H)
Burst Array Read with Synchronous Delay (Opcode: 69H)
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 8447
OF
PAGE n
LSB MSB
tSU
tV
SI
0
1XX
CS
SO
SCK
12 63 64 65 66 67
HIGH IMPEDANCE
D
7
D
6
D
1
D
0
D
7
D
6
DATA OUT
BIT 8447
OF
PAGE n
LSB MSB
tSU
tV
32 CLOCKS
BIT 0
OF
PAGE n+1
1
2
31 32 33
Don't Care
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AT45DB642-TC

Mfr. #:
Buy AT45DB642-TC
Manufacturer:
Microchip Technology / Atmel
Description:
NOR Flash 64M bit
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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