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AT45DB021B-RC Datasheet(PDF) 6 Page - ATMEL Corporation |
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AT45DB021B-RC Datasheet(HTML) 6 Page - ATMEL Corporation |
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6 / 33 page  6 AT45DB021B 1937F–DFLSH–10/02 place in a maximum time of t EP. During this time, the status register will indicate that the part is busy. BUFFER TO MAIN MEMORY PAGE PROGRAM WITHOUT BUILT-IN ERASE: Aprevi- ously erased page within main memory can be programmed with the contents of either buffer 1 or buffer 2. To start the operation, an 8-bit opcode (88H for buffer 1 or 89H for buffer 2) must be followed by the five reserved bits, 10 address bits (PA9 - PA0) that specify the page in the main memory to be written, and nine additional don’tcare 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 memory. It is necessary that the page in main memory that is being programmed has been previously erased. The programming of the page is internally self-timed and should take place in a maximum time of t P.Dur- ing this time, the status register will indicate that the part is busy. Successive page programming operations without doing a page erase are not recom- mended. In other words, changing bytes within a page from a “1” to a “0” during multiple page programming operations without erasing that page is not recommended. PAGE ERASE: The optional Page Erase command can be used to individually erase any page in the main memory array allowing the Buffer to Main Memory Page Program without Built-in Erase command to be utilized at a later time. To perform a Page Erase, an opcode of 81H must be loaded into the device, followed by five reserved bits, ten address bits (PA9-PA0), and nine don’t care bits. The ten address bits are used to spec- ify which page of the memory array is to be erased. When a low-to-high transition occurs on the CS pin, the part will erase the selected page to 1s. The erase operation is inter- nally self-timed and should take place in a maximum time of t PE. During this time, the status register will indicate that the part is busy. BLOCK ERASE: A block of eight pages can be erased at one time allowing the Buffer to Main Memory Page Program without Built-in Erase command to be utilized to reduce programming times when writing large amounts of data to the device. To perform a Block Erase, an opcode of 50H must be loaded into the device, followed by five reserved bits, seven address bits (PA9 -PA3), and 12 don’t care bits. The seven address bits are used to specify which block of eight pages is to be erased. When a low-to-high transition occurs on the CS pin, the part will erase the selected block of eight pages to 1s. The erase operation is internally self-timed and should take place in a maximum time of t BE. During this time, the status register will indicate that the part is busy. Block Erase Addressing PA9 PA8 PA7 PA6 PA5 PA4 PA3 PA2 PA1 PA0 Block 0000000 X X X 0 0000001 X X X 1 0000010 X X X 2 0000011 X X X 3 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1111100 X X X 124 1111101 X X X 125 1111110 X X X 126 1111111 X X X 127 |
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Similar Description - AT45DB021B-RC |
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