AT45DB021D-SH-B Atmel, AT45DB021D-SH-B Datasheet - Page 10

• Manufacturer Part Number: AT45DB021D-SH-B
• Description: IC FLASH 2MBIT 66MHZ 8SOIC
• Manufacturer: Atmel

Specifications of AT45DB021D-SH-B

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 2M (1024 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-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Architecture: Sectored
• Interface Type: SPI Serial
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Current: 15 mA
• Mounting Style: SMD/SMT
• Organization: 32 KB x 8
• Memory Configuration: 1024 Pages X 264 Bytes
• Clock Frequency: 66MHz
• Supply Voltage Range: 2.7V To 3.6V
• Memory Case Style: SOIC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AT45DB021D-SU; AT45DB021D-SU

5.8
6.
6.1
6.1.1
10
Main Memory Page Program Through Buffer
This operation is a combination of the Buffer Write and Buffer to Main Memory Page Program with Built-in Erase
operations. Data is first clocked into the buffer from the input pin (SI) and then programmed into a specified page in
the main memory. To perform a main memory page program through buffer for the Atmel
page size (264-bytes), a 1-byte opcode, 82H, must first be clocked into the device, followed by three address
bytes. The address bytes are comprised of five don’t care bits, 10 page address bits, (PA9 - PA0) that select the
page in the main memory where data is to be written, and nine buffer address bits (BFA8 - BFA0) that select the
first byte in the buffer to be written. To perform a main memory page program through buffer for the binary page
size (256-bytes), the opcode 82H must be clocked into the device followed by three address bytes consisting of six
don’t care bits, 10 page address bits (A17 - A8) that specify the page in the main memory to be written, and eight
buffer address bits (BFA7 - BFA0) that selects the first byte in the buffer to be written. After all address bytes are
clocked in, the part will take data from the input pins and store it in the specified data buffer. If the end of the buffer
is reached, the device will wrap around back to the beginning of the buffer. When there is a low-to-high transition
on the CS pin, the part will first erase the selected page in main memory to all ones and then program the data
stored in the buffer into that memory page. Both the erase and the programming of the page are internally self-
timed and should take place in a maximum time of t
is busy.
Sector Protection
Two protection methods, hardware and software controlled, are provided for protection against inadvertent or
erroneous program and erase cycles. The software controlled method relies on the use of software commands to
enable and disable sector protection while the hardware controlled method employs the use of the Write Protect
(WP) pin. The selection of which sectors that are to be protected or unprotected against program and erase
operations is specified in the nonvolatile Sector Protection Register. The status of whether or not sector protection
has been enabled or disabled by either the software or the hardware controlled methods can be determined by
checking the Status Register.
Software Sector Protection
Enable Sector Protection Command
Sectors specified for protection in the Sector Protection Register can be protected from program and erase
operations by issuing the Enable Sector Protection command. To enable the sector protection using the software
controlled method, the CS pin must first be asserted as it would be with any other command. Once the CS pin has
been asserted, the appropriate 4-byte command sequence must be clocked in via the input pin (SI). After the last
bit of the command sequence has been clocked in, the CS pin must be deasserted after which the sector
protection will be enabled.
Table 6-1.
Figure 6-1.
Command
Enable Sector Protection
CS
Atmel AT45DB021D
SI
Each transition
represents 8 bits
Enable Sector Protection Command
Enable Sector Protection
Opcode
Byte 1
Opcode
Byte 2
Opcode
Byte 3
Byte 1
3DH
Opcode
EP
Byte 4
. During this time, the status register will indicate that the part
Byte 2
2AH
Byte 3
7FH
Byte 4
A9H
®
DataFlash
3638J–DFLASH–5/10
®
standard