AT45DB321C-TU Atmel, AT45DB321C-TU Datasheet - Page 26

• Manufacturer Part Number: AT45DB321C-TU
• Description: IC FLASH 32MBIT 40MHZ 28TSOP
• Manufacturer: Atmel

Specifications of AT45DB321C-TU

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 32M (8192 pages x 528 bytes)
• Speed: 40MHz
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-TSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

14. Write Operations
14.1
14.2
14.3
26
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
CS
SI
AT45DB321C
SI
CS
SI
CMD
CMD
The following block diagram and waveforms illustrate the various write sequences available.
PAGE PROGRAM
MAIN MEMORY
PAGE (528 BYTES)
BUFFER 1 (528 BYTES)
r, PA12-6
BUFFER 1 TO
X
BUFFER 1
WRITE
CMD
PA5-0, BFA9-8
X···X, BFA9-8
r , PA12-6
BFA7-0
BFA7-0
FLASH MEMORY ARRAY
Starts self-timed erase/program operation
MAIN MEMORY PAGE
PROGRAM THROUGH
BUFFER 1
PA5-0, XX
I/O INTERFACE
THROUGH BUFFER 2
n
n
PAGE PROGRAM
MAIN MEMORY
SI
n+1
n+1
· Completes writing into selected buffer
· Completes writing into selected buffer
· Starts self-timed erase/program operation
X
BUFFER 2 (528 BYTES)
n = 1st byte write
n+1 = 2nd byte write
Last Byte
Last Byte
BUFFER 2 TO
MAIN MEMORY
PAGE PROGRAM
BUFFER 2
WRITE
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