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AT45DB642D Datasheet(PDF) 13 Page - ATMEL Corporation

Part # AT45DB642D
Description  64-megabit 2.7-volt Dual-interface DataFlash
PDF  55 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT45DB642D Datasheet(HTML) 13 Page - ATMEL Corporation

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3542F–DFLASH–09/06
AT45DB642D
8.1
Software Sector Protection
8.1.1
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 pins (SI or I/O7-I/O0). After the last bit of the com-
mand sequence has been clocked in, the CS pin must be deasserted after which the sector
protection will be enabled.
Figure 8-1.
Enable Sector Protection
8.1.2
Disable Sector Protection Command
To disable 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 sequence for the Disable Sector Protection command must be clocked in via
the input pins (SI or I/O7-I/O0). 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 disabled. The WP pin
must be in the deasserted state; otherwise, the Disable Sector Protection command will be
ignored.
Figure 8-2.
Disable Sector Protection
Command
Byte 1
Byte 2
Byte 3
Byte 4
Enable Sector Protection
3DH
2AH
7FH
A9H
Opcode
Byte 1
Opcode
Byte 2
Opcode
Byte 3
Opcode
Byte 4
CS
Each transition
represents 8 bits
SI or IO
7 - IO0
Command
Byte 1
Byte 2
Byte 3
Byte 4
Disable Sector Protection
3DH
2AH
7FH
9AH
Opcode
Byte 1
Opcode
Byte 2
Opcode
Byte 3
Opcode
Byte 4
CS
Each transition
represents 8 bits
SI or IO
7 - IO0



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