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AT45DB321D Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT45DB321D Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 55 page  10 3597H–DFLASH–02/07 AT45DB321D [Preliminary] 7.6 Sector Erase The Sector Erase command can be used to individually erase any sector in the main memory. There are 64 sectors and only one sector can be erased at one time. To perform sector 0a or sector 0b erase for the DataFlash standard page size (528 bytes), an opcode of 7CH must be loaded into the device, followed by three address bytes comprised of 1 don’t care bit, 10 page address bits (PA12 - PA3) and 13 don’t care bits. To perform a sector 1-63 erase, the opcode 7CH must be loaded into the device, followed by three address bytes comprised of 1 don’t care bit, 4 page address bits (PA12 - PA9) and 19 don’t care bits. To perform sector 0a or sector 0b erase for the binary page size (512 bytes), an opcode of 7CH must be loaded into the device, followed by three address bytes comprised of 2 don’t care bit and 10 page address bits (A21 - A12) and 12 don’t care bits. To perform a sector 1-63 erase, the opcode 7CH must be loaded into the device, followed by three address bytes comprised of 2 don’t care bits and 4 page address bits (A21 - A18) and 18 don’t care bits. The page address bits are used to spec- ify 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/ A21 PA11/ A20 PA10/ A19 PA9/ A18 PA8/ A17 PA7/ A16 PA6/ A15 PA5/ A14 PA4/ A13 PA3/ A12 PA2/ A11 PA1/ A10 PA0/ A9 Sector 00 00000 000 X X X 0a 00 00000 001 X X X 0b 00 0001 XXXX XXX 1 00 0010 XXXX XXX 2 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 11 1100 XXXX XXX 60 11 1101 XXXX XXX 61 11 1110 XXXX XXX 62 11 1111 XXXX XXX 63 |
Similar Part No. - AT45DB321D_07 |
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Similar Description - AT45DB321D_07 |
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