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AT45DB642D-TU Datasheet(PDF) 22 Page - ATMEL Corporation |
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AT45DB642D-TU Datasheet(HTML) 22 Page - ATMEL Corporation |
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22 / 55 page  22 3542F–DFLASH–09/06 AT45DB642D 11. Additional Commands 11.1 Main Memory Page to Buffer Transfer A page of data can be transferred from the main memory to either buffer 1 or buffer 2. To start the operation for the standard DataFlash page size (1056 bytes), a 1-byte opcode, 53H for buffer 1 and 55H for buffer 2, must be clocked into the device, followed by three address bytes comprised of 13 page address bits (PA12 - PA0), which specify the page in main memory that is to be transferred, and 11 don’t care bits. To perform a main memory page to buffer transfer for the binary page size (1024 bytes), the opcode 53H for buffer 1 or 55H for buffer 2, must be clocked into the device followed by three address bytes consisting of 13 page address bits (A22 - A10) which specify the page in the main memory that is to be transferred, and 10 don’t care bits. The CS pin must be low while toggling the SCK/CLK pin to load the opcode and the address bytes from the input pins (SI or I/O7 - I/O0). The transfer of the page of data from the main memory to the buffer will begin when the CS pin transitions from a low to a high state. Dur- ing the transfer of a page of data (t XFR), the status register can be read or the RDY/BUSY can be monitored to determine whether the transfer has been completed. 11.2 Main Memory Page to Buffer Compare A page of data in main memory can be compared to the data in buffer 1 or buffer 2. To initiate the operation for standard DataFlash page size, a 1-byte opcode, 60H for buffer 1 and 61H for buffer 2, must be clocked into the device, followed by three address bytes consisting of 13 page address bits (PA12 - PA0) that specify the page in the main memory that is to be compared to the buffer, and 11 don’t care bits. To start a main memory page to buffer compare for a binary page size, the opcode 60H for buffer 1 or 61H for buffer 2, must be clocked into the device fol- lowed by three address bytes consisting of 13 page address bits (A22 - A10) that specify the page in the main memory that is to be compared to the buffer, and 10 don’t care bits. The CS pin must be low while toggling the SCK/CLK pin to load the opcode and the address bytes from the input pins (SI or I/O7 - I/O0). On the low-to-high transition of the CS pin, the data bytes in the selected main memory page will be compared with the data bytes in buffer 1 or buffer 2. During this time (t COMP), the status register and the RDY/BUSY pin will indicate that the part is busy. On completion of the compare operation, bit 6 of the status register is updated with the result of the compare. 11.3 Auto Page Rewrite This mode is only needed if multiple bytes within a page or multiple pages of data are modified in a random fashion within a sector. This mode is a combination of two operations: Main Memory Page to Buffer Transfer and Buffer to Main Memory Page Program with Built-in Erase. A page of data is first transferred from the main memory to buffer 1 or buffer 2, and then the same data (from buffer 1 or buffer 2) is programmed back into its original page of main memory. To start the rewrite operation for standard DataFlash page size (1056 bytes), a 1-byte opcode, 58H for buffer 1 or 59H for buffer 2, must be clocked into the device, followed by three address bytes com- prised of 13 page address bits (PA12-PA0) that specify the page in main memory to be rewritten and 11 don’t care bits. To initiate an auto page rewrite for a binary page size (1024 bytes), the opcode 58H for buffer 1 or 59H for buffer 2, must be clocked into the device followed by three address bytes consisting of 13 page address bits (A22 - A10) that specify the page in the main memory that is to be written and 10 don’t care bits. When a low-to-high transition occurs on the CS pin, the part will first transfer data from the page in main memory to a buffer and then pro- gram the data from the buffer back into same page of main memory. The operation is internally self-timed and should take place in a maximum time of t EP. During this time, the status register and the RDY/BUSY pin will indicate that the part is busy. |
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