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AT45DB081D-SU-2.5 Datasheet(PDF) 10 Page - Analog Devices |
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AT45DB081D-SU-2.5 Datasheet(HTML) 10 Page - Analog Devices |
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10 / 53 page  10 3596O–DFLASH–1/2013 AT45DB081D 7.6 Sector Erase The Sector Erase command can be used to individually erase any sector in the main memory. There are 16 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 (264-bytes), an opcode of 7CH must be loaded into the device, followed by three address bytes comprised of three don’t care bits, nine page address bits (PA11 - PA3) and 12 don’t care bits. To perform a sector 1-15 erase, the opcode 7CH must be loaded into the device, followed by three address bytes comprised of three don’t care bits, four page address bits (PA11 - PA8) and 17 don’t care bits. To perform sector 0a or sector 0b erase for the binary page size (256-bytes), an opcode of 7CH must be loaded into the device, followed by three address bytes comprised of four don’t care bit and nine page address bits (A19 - A11) and 11 don’t care bits. To perform a sector 1-15 erase, the opcode 7CH must be loaded into the device, followed by three address bytes comprised of four don’t care bit and four page address bits (A19 - A16) and 16 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 tSE. During this time, the status register will indicate that the part is busy. 7.7 Chip Erase 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 tCE. 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 PA11/ A19 PA10/ A18 PA9/ A17 PA8/ A16 PA7/ A15 PA6/ A14 PA5/ A13 PA4/ A12 PA3/ A11 PA2/ A10 PA1/ A9 PA0/ A8 Sector 000000000 X X X 0a 000000001 X X X 0b 0001 XXXXXXXX 1 0010 XXXXXXXX 2 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1100 XXXXXXXX 12 1101 XXXXXXXX 13 1110 XXXXXXXX 14 1111 XXXXXXXX 15 |
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