AT45DB642D-CNU-SL954 ATMEL [ATMEL Corporation], AT45DB642D-CNU-SL954 Datasheet - Page 17

• Manufacturer Part Number: AT45DB642D-CNU-SL954
• Description: 64-megabit 2.7-volt Dual-interface DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 9-3.
9.1.3
Figure 9-4.
3542H–DFLASH–4/08
SI or IO
SO or IO
SI or IO
7
Read Sector Protection Register Command
- IO
7
7
CS
- IO
- IO
Program Sector Protection Register
Read Sector Protection Register
CS
0
0
0
Each transition
represents 8 bits
Each transition
represents 8 bits
The Program Sector Protection Register command utilizes the internal SRAM buffer for process-
ing. Therefore, the contents of the buffer will be altered from its previous state when this
command is issued.
To read the Sector Protection Register, the CS pin must first be asserted. Once the CS pin has
been asserted, an opcode of 32H and a series of dummy bytes (3 dummy bytes if using the
serial interface or 7 dummy bytes if using the 8-bit interface) must be clocked in via the SI or I/O7
or I/O0 pins. After the last bit of the opcode and dummy bytes have been clocked in, any addi-
tional clock pulses on the SCK/CLK pins will result in data for the content of the Sector
Protection Register being output on the SO or I/O7-I/O0 pins. The first byte corresponds to sec-
tor 0 (0a, 0b), the second byte corresponds to sector 1 and the last byte (byte 32) corresponds to
sector 31. Once the last byte of the Sector Protection Register has been clocked out, any addi-
tional clock pulses will result in undefined data being output on the SO or I/O pins. The CS must
be deasserted to terminate the Read Sector Protection Register operation and put the output
into a high-impedance state.
Note:
Command
Program Sector Protection Register
Command
Read Sector Protection Register
Opcode
Byte 1
Opcode
xx = Dummy Byte
Opcode
Byte 2
X
Opcode
Byte 3
Serial Interface = 3 Dummy Bytes
X
Opcode
Byte 4
X
Byte 1
Byte 1
3DH
32H
Data Byte
Data Byte
n
n
Data Byte
Byte 2
Byte 2
2AH
xxH
n + 1
Data Byte
n + 1
8-bit Interface = 7 Dummy Bytes
AT45DB642D
Byte 3
Byte 3
7FH
xxH
Data Byte
n + 31
Data Byte
n + 31
Byte 4
Byte 4
FCH
xxH
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