AT45DB041B-RI Atmel, AT45DB041B-RI Datasheet - Page 17

• Manufacturer Part Number: AT45DB041B-RI
• Description: IC FLASH 4MBIT 20MHZ 28SOIC
• Manufacturer: Atmel

Specifications of AT45DB041B-RI

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 4M (2048 pages x 264 bytes)
• Speed: 20MHz
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

12. Write Operations
12.1
12.2
12.3
3443D–DFLSH–2/08
Each transition represents
8 bits and 8 clock cycles
Main Memory Page Program through Buffers
Buffer Write
Buffer to Main Memory Page Program (Data from Buffer Programmed into Flash Page)
CS
SI
CS
SI
PAGE PROGRAM
PAGE (256 BYTES)
BUFFER 1 (256 BYTES)
BUFFER 1 TO
BUFFER 1
CMD
The following block diagram and waveforms illustrate the various write sequences available.
WRITE
CMD
CS
SI
r r r r, PA10-7
X
PA6-0, BFA8
CMD
X···X, BFA8
FLASH MEMORY ARRAY
PAGE PROGRAM
THROUGH BUFFER 1
I/O INTERFACE
r r r r, PA10-7
THROUGH BUFFER 2
BFA7-0
BFA7-0
PAGE PROGRAM
SI
Starts self-timed erase/program operation
PA6-0, X
n
n
n+1
BUFFER 2 (256 BYTES)
· Completes writing into selected buffer
X
n+1
· Completes writing into selected buffer
· Starts self-timed erase/program operation
BUFFER 2 TO
PAGE PROGRAM
BUFFER 2
WRITE
Last Byte
Last Byte
AT45DB041B
n = 1st byte read
n+1 = 2nd byte read
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