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M28010-20KA1T Datasheet(PDF) 6 Page - STMicroelectronics |
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M28010-20KA1T Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 23 page M28010 6/23 Figure 5. Software Data Protection Disable Algorithms (with or without Memory Write) Wait for write completion (tQ5HQ5X) Wait for write completion (tQ5HQ5X) AI02226B Write AAh in Address 5555h Write 55h in Address 2AAAh Write 80h in Address 5555h SDP is Disabled Write AAh in Address 5555h Write 55h in Address 2AAAh Write 20h in Address 5555h Page Write Timing SDP is Enabled and Application needs to Disable it Time Out (tWLQ5H) Write AAh in Address 5555h Write 55h in Address 2AAAh Write 80h in Address 5555h DATA has been written and SDP is Disabled Write AAh in Address 5555h Write 55h in Address 2AAAh Write 20h in Address 5555h Page Write Timing SDP is Enabled and Application needs to Write Data Time Out (tWLQ5H) Write data in any addresses within one page Physical Write Instructions can be detected by reading the status of the Data Polling and the Toggle Bit functions on DQ7 and DQ6. Page Write The Page Write mode allows up to 128 bytes to be written on a single page in a single go. This is achieved through a series of successive Write operations, no two of which are separated by more than the tWLQ5H value (as specified in Table 9A to Table 9C). The page write can be initiated during any byte write operation. Following the first Byte Write instruction, the host may send another address and data with a minimum data transfer rate of: 1/tWLQ5H. The internal write cycle can start at any instant after tWLQ5H. Once initiated, the write operation is internally timed, and continues, uninterrupted, until completion. All bytes must be located on the same page address (A16-A7 must be the same for all bytes). Otherwise, the Page Write operation is not executed. The Page Write Abort event is indicated to the application via DQ1 (as described on page 8). As with the single byte Write operation, described above, the DQ5, DQ6 and DQ7 lines can be used to detect the beginning and end of the internally controlled phase of the Page Write cycle. Software Data Protection (SDP) The device offers a software-controlled write- protection mechanism that allows the user to inhibit all write operations to the device, including chip erase. This can be useful for protecting the |
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