AT45DB081D-MU Atmel, AT45DB081D-MU Datasheet - Page 21

• Manufacturer Part Number: AT45DB081D-MU
• Description: IC FLASH 8MBIT 66MHZ 8VDFN
• Manufacturer: Atmel

Specifications of AT45DB081D-MU

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 8M (4096 pages x 264 bytes)
• Speed: 66MHz
• Interface: SPI, RapidS
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-VFQFN, 8-VFQFPN
• Architecture: Sectored
• Interface Type: SPI
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Current: 15 mA
• Mounting Style: SMD/SMT
• Organization: 64 KB x 16
• Density: 8Mb
• Access Time (max): 6ns
• Boot Type: Not Required
• Address Bus: 1b
• Operating Supply Voltage (typ): 3/3.3V
• Operating Temp Range: -40C to 85C
• Package Type: MLF EP
• Program/erase Volt (typ): 2.7 to 3.6V
• Sync/async: Synchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Supply Current: 15mA
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.3
11.4
3596M–DFLASH–5/10
Auto Page Rewrite
Status Register Read
completion of the compare operation, bit six of the status register is updated with the result of
the compare.
This mode is only needed if multiple bytes within a page or multiple pages of data are modified in
a random fashion within a sector. This mode is a combination of two operations: Main Memory
Page to Buffer Transfer and Buffer to Main Memory Page Program with Built-in Erase. A page of
data is first transferred from the main memory to buffer 1 or buffer 2, and then the same data
(from buffer 1 or buffer 2) is programmed back into its original page of main memory. To start the
rewrite operation for the Atmel
58H for buffer 1 or 59H for buffer 2, must be clocked into the device, followed by three address
bytes comprised of three don’t care bits, 12 page address bits (PA11-PA0) that specify the page
in main memory to be rewritten and nine don’t care bits. To initiate an auto page rewrite for a
binary page size (256-bytes), the opcode 58H for buffer 1 or 59H for buffer 2, must be clocked
into the device followed by three address bytes consisting of four don’t care bits, 12 page
address bits (A19 - A8) that specify the page in the main memory that is to be written and eight
don’t care bits. When a low-to-high transition occurs on the CS pin, the part will first transfer data
from the page in main memory to a buffer and then program the data from the buffer back into
same page of main memory. The operation is internally self-timed and should take place in a
maximum time of t
If a sector is programmed or reprogrammed sequentially page by page, then the programming
algorithm shown in
page or several pages are programmed randomly in a sector, then the programming algorithm
shown in
updated/rewritten at least once within every 20,000 cumulative page erase/program operations
in that sector. Please contact Atmel for availability of devices that are specified to exceed the
20K cycle cumulative limit.
The status register can be used to determine the device’s ready/busy status, page size, a Main
Memory Page to Buffer Compare operation result, the Sector Protection status or the device
density. The Status Register can be read at any time, including during an internally self-timed
program or erase operation. To read the status register, the CS pin must be asserted and the
opcode of D7H must be loaded into the device. After the opcode is clocked in, the 1-byte status
register will be clocked out on the output pin (SO), starting with the next clock cycle. The data in
the status register, starting with the MSB (bit 7), will be clocked out on the SO pin during the next
eight clock cycles. After the one byte of the status register has been clocked out, the sequence
will repeat itself (as long as CS remains low and SCK is being toggled). The data in the status
register is constantly updated, so each repeating sequence will output new data.
Ready/busy status is indicated using bit seven of the status register. If bit seven is a one, then
the device is not busy and is ready to accept the next command. If bit seven is a zero, then the
device is in a busy state. Since the data in the status register is constantly updated, the user
must toggle SCK pin to check the ready/busy status. There are several operations that can
cause the device to be in a busy state: Main Memory Page to Buffer Transfer, Main Memory
Page to Buffer Compare, Buffer to Main Memory Page Program, Main Memory Page Program
through Buffer, Page Erase, Block Erase, Sector Erase, Chip Erase and Auto Page Rewrite.
Figure 25-2 (page
EP
Figure 25-1 (page
. During this time, the status register will indicate that the part is busy.
®
46) is recommended. Each page within a sector must be
DataFlash
45) is recommended. Otherwise, if multiple bytes in a
®
standard page size (264-bytes), a 1-byte opcode,
Atmel AT45DB081D
21