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AT45DB642D-TU Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT45DB642D-TU Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 55 page  11 3542F–DFLASH–09/06 AT45DB642D 7.6 Sector Erase The Sector Erase command can be used to individually erase any sector in the main memory. There are 32 sectors and only one sector can be erased at one time. To perform sector 0a or sector 0b erase for the standard DataFlash page size (1056 bytes), an opcode of 7CH must be loaded into the device, followed by three address bytes comprised of 10 page address bits (PA12 - PA3) and 14 don’t care bits. To perform a sector 1-31 erase, the opcode 7CH must be loaded into the device, followed by three address bytes comprised of 5 page address bits (PA12 - PA8) and 19 don’t care bits. To perform sector 0a or sector 0b erase for the binary page size (1024 bytes), an opcode of 7CH must be loaded into the device, followed by three address bytes comprised of 1 don’t care bit and 10 page address bits (A22 - A13) and 13 don’t care bits. To perform a sector 1-31 erase, the opcode 7CH must be loaded into the device, followed by three address bytes comprised of 1 don’t care bit and 5 page address bits (PA12 - PA8) and 18 don’t care bits. The page address bits are used to specify any valid address location within the sector which is to be erased. When a low-to-high transition occurs on the CS pin, the part will erase the selected sector. The erase operation is internally self-timed and should take place in a maximum time of t SE. During this time, the status register and the RDY/BUSY pin will indicate that the part is busy. 7.7 Chip Erase(1) The entire main memory can be erased at one time by using the Chip Erase command. To execute the Chip Erase command, a 4-byte command sequence C7H, 94H, 80H and 9AH must be clocked into the device. Since the entire memory array is to be erased, no address bytes need to be clocked into the device, and any data clocked in after the opcode will be ignored. After the last bit of the opcode sequence has been clocked in, the CS pin can be deas- serted to start the erase process. The erase operation is internally self-timed and should take place in a time of t CE. During this time, the Status Register will indicate that the device is busy. The Chip Erase command will not affect sectors that are protected or locked down; the contents of those sectors will remain unchanged. Only those sectors that are not protected or locked down will be erased. Table 7-2. Sector Erase Addressing PA12/ A22 PA11/ A21 PA10/ A20 PA9/ A19 PA8/ A18 PA7/ A17 PA6/ A16 PA5/ A15 PA4/ A14 PA3/ A13 PA2/ A12 PA1/ A11 PA0/ A10 Sector 00 00 000 00 0 X X X 0a 00 00 000 00 1 X X X 0b 0 0 0 0 1 XXX XX XXX 1 0 0 0 1 0 XXX XX XXX 2 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1 1 1 0 0 XXX XX XXX 28 1 1 1 0 1 XXX XX XXX 29 1 1 1 1 0 XXX XX XXX 30 1 1 1 1 1 XXX XX XXX 31 |
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