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AT45DB081D Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT45DB081D Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 54 page  8 3596L–DFLASH–04/09 AT45DB081D 7. Program and Erase Commands 7.1 Buffer Write Data can be clocked in from the input pin (SI) into either buffer 1 or buffer 2. To load data into the standard DataFlash buffer (264 bytes), a 1-byte opcode, 84H for buffer 1 or 87H for buffer 2, must be clocked into the device, followed by three address bytes comprised of 15 don’t care bits and 9 buffer address bits (BFA8 - BFA0). The 9 buffer address bits specify the first byte in the buffer to be written. To load data into the binary buffers (256 bytes each), a 1-byte opcode 84H for buffer 1 or 87H for buffer 2, must be clocked into the device, followed by three address bytes comprised of 16 don’t care bits and 8 buffer address bits (BFA7 - BFA0). The 8 buffer address bits specify the first byte in the buffer to be written. After the last address byte has been clocked into the device, data can then be clocked in on subsequent clock cycles. If the end of the data buffer is reached, the device will wrap around back to the beginning of the buffer. Data will con- tinue to be loaded into the buffer until a low-to-high transition is detected on the CS pin. 7.2 Buffer to Main Memory Page Program with Built-in Erase Data written into either buffer 1 or buffer 2 can be programmed into the main memory. A 1-byte opcode, 83H for buffer 1 or 86H for buffer 2, must be clocked into the device. For the DataFlash standard page size (264 bytes), the opcode must be followed by three address bytes consist of 3 don’t care bits, 12 page address bits (PA11 - PA0) that specify the page in the main memory to be written and 9 don’t care bits. To perform a buffer to main memory page program with built-in erase for the binary page size (256 bytes), the opcode 83H for buffer 1 or 86H for buffer 2, must be clocked into the device followed by three address bytes consisting of 4 don’t care bits 12 page address bits (A19 - A8) that specify the page in the main memory to be written and 8 don’t care bits. When a low-to-high transition occurs on the CS pin, the part will first erase the selected page in main memory (the erased state is a logic 1) and then program the data stored in the buffer into the specified page in main memory. Both the erase and the programming of the page are internally self-timed and should take place in a maximum time of tEP. During this time, the status register will indicate that the part is busy. 7.3 Buffer to Main Memory Page Program without Built-in Erase A previously-erased page within main memory can be programmed with the contents of either buffer 1 or buffer 2. A 1-byte opcode, 88H for buffer 1 or 89H for buffer 2, must be clocked into the device. For the DataFlash standard page size (264 bytes), the opcode must be followed by three address bytes consist of 3 don’t care bits, 12 page address bits (PA11 - PA0) that specify the page in the main memory to be written and 9 don’t care bits. To perform a buffer to main memory page program without built-in erase for the binary page size (256 bytes), the opcode 88H for buffer 1 or 89H for buffer 2, must be clocked into the device followed by three address bytes consisting of 4 don’t care bits, 12 page address bits (A19 - A8) that specify the page in the main memory to be written and 8 don’t care bits. When a low-to-high transition occurs on the CS pin, the part will program the data stored in the buffer into the specified page in the main mem- ory. It is necessary that the page in main memory that is being programmed has been previously erased using one of the erase commands (Page Erase or Block Erase). The programming of the page is internally self-timed and should take place in a maximum time of tP. During this time, the status register will indicate that the part is busy. |
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