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AT45DB642D-TU Datasheet(PDF) 19 Page - ATMEL Corporation |
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AT45DB642D-TU Datasheet(HTML) 19 Page - ATMEL Corporation |
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19 / 55 page  19 3542F–DFLASH–09/06 AT45DB642D 10.1.1 Sector Lockdown Register Sector Lockdown Register is a nonvolatile register that contains 32 bytes of data, as shown below: 10.1.2 Reading the Sector Lockdown Register The Sector Lockdown Register can be read to determine which sectors in the memory array are permanently locked down. To read the Sector Lockdown Register, the CS pin must first be asserted. Once the CS pin has been asserted, an opcode of 35H 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 into the device via the SI or I/O7-O0 pins. After the last bit of the opcode and dummy bytes have been clocked in, the data for the contents of the Sector Lockdown Register will be clocked out on the SO pin or the I/O7-O0 pins. The first byte corresponds to sector 0 (0a, 0b) the second byte corresponds to sector 1 and the las byte (byte 32) corresponds to sector 31. After the last byte of the Sector Lockdown Register has been read, additional pulses on the SCK pin will simply result in undefined data being output on the SO pin. Deasserting the CS pin will terminate the Read Sector Lockdown Register operation and put the SO pin or I/O7-O0 pins into a high-impedance state. Table 10-2 details the values read from the Sector Lockdown Register. Figure 10-2. Read Sector Lockdown Register Sector Number 0 (0a, 0b) 1 to 31 Locked See Below FFH Unlocked 00H Table 10-1. Sector 0 (0a, 0b) 0a 0b Bit 3, 2 Data Value (Page 0-7) (Page 8-255) Bit 7, 6 Bit 5, 4 Bit 1, 0 Sectors 0a, 0b Unlocked 00 00 00 00 00H Sector 0a Locked 11 00 00 00 C0H Sector 0b Locked (Page 8-255) 00 11 00 00 30H Sectors 0a, 0b Locked (Page 0-255) 11 11 00 00 F0H Table 10-2. Sector Lockdown Register Command Byte 1 Byte 2 Byte 3 Byte 4 Read Sector Lockdown Register 35H xxH xxH xxH Note: xx = Dummy Byte Serial Interface = 3 Dummy Bytes 8-bit Interface = 7 Dummy Bytes Opcode X X X Data Byte n Data Byte n + 1 CS Data Byte n + 31 SI or IO 7 - IO0 SO or IO 7 - IO0 Each transition represents 8 bits |
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