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M29F800AT70M1T Datasheet(PDF) 10 Page - STMicroelectronics |
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M29F800AT70M1T Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 21 page M29F800AT, M29F800AB 10/21 Figure 3. Data Polling Flowchart READ DQ5 & DQ7 at VALID ADDRESS START READ DQ7 FAIL PASS AI01369 DQ7 = DATA YES NO YES NO DQ5 =1 DQ7 = DATA YES NO Figure 4. Data Toggle Flowchart READ DQ5 & DQ6 START READ DQ6 FAIL PASS AI01370 DQ6 = TOGGLE NO NO YES YES DQ5 =1 NO YES DQ6 = TOGGLE Toggle Bit (DQ6). The Toggle Bit can be used to identify whether the Program/Erase Controller has successfully completed its operation or if it has re- sponded to an Erase Suspend. The Toggle Bit is output on DQ6 when the Status Register is read. During Program and Erase operations the Toggle Bit changes from ’0’ to ’1’ to ’0’, etc., with succes- sive Bus Read operations at any address. After successful completion of the operation the memo- ry returns to Read mode. During Erase Suspend mode the Toggle Bit will output when addressing a cell within a block being erased. The Toggle Bit will stop toggling when the Program/Erase Controller has suspended the Erase operation. Figure 4, Data Toggle Flowchart, gives an exam- ple of how to use the Data Toggle Bit. Error Bit (DQ5). The Error Bit can be used to identify errors detected by the Program/Erase Controller. The Error Bit is set to ’1’ when a Pro- gram, Block Erase or Chip Erase operation fails to write the correct data to the memory. If the Error Bit is set a Read/Reset command must be issued before other commands are issued. The Error bit is output on DQ5 when the Status Register is read. Note that the Program command cannot change a bit set at ’0’ back to ’1’ and attempting to do so will cause an error. One of the Erase Commands must be used to set all the bits in a block or in the whole memory from ’0’ to ’1’. Erase Timer Bit (DQ3). The Erase Timer Bit can be used to identify the start of Program/Erase Controller operation during a Block Erase com- mand. Once the Program/Erase Controller starts erasing the Erase Timer Bit is set to ’1’. Before the Program/Erase Controller starts the Erase Timer Bit is set to ’0’ and additional blocks to be erased may be written to the Command Interface. The Erase Timer Bit is output on DQ3 when the Status Register is read. |
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