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M29W400BT90N6T Datasheet(PDF) 11 Page - STMicroelectronics |
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M29W400BT90N6T Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 25 page  11/25 M29W400BT, M29W400BB STATUS REGISTER Bus Read operations from any address always read the Status Register during Program and Erase operations. It is also read during Erase Sus- pend when an address within a block being erased is accessed. The bits in the Status Register are summarized in Table 10, Status Register Bits. Data Polling Bit (DQ7). The Data Polling Bit can be used to identify whether the Program/Erase Controller has successfully completed its opera- tion or if it has responded to an Erase Suspend. The Data Polling Bit is output on DQ7 when the Status Register is read. During Program operations the Data Polling Bit outputs the complement of the bit being pro- grammed to DQ7. After successful completion of the Program operation the memory returns to Read mod and Bus Read operations from the ad- dress just programmed output DQ7, not its com- plemente. During Erase operations the Data Polling Bit out- puts ’0’, the complement of the erased state of DQ7. After successful completion of the Erase op- eration the memory returns to Read Mode. In Erase Suspend mode the Data Polling Bit will output a ’1’ during a Bus Read operation within a block being erased. The Data Polling Bit will change from a ’0’ to a ’1’ when the Program/Erase Controller has suspended the Erase operation. Figure 5, Data Polling Flowchart, gives an exam- ple of how to use the Data Polling Bit. A Valid Ad- dress is the address being programmed or an address within the block being erased. 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 6, Data Toggle Flowchart, gives an exam- ple of how to use the Data Toggle Bit. Error Bit (DQ5). TheErrorBit canbeusedto 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 may or may not set DQ5 at ’1’. In both cases, a succes- sive Bus Read operation will show the bit is still ’0’. 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’. Table 10. Status Register Bits Note: Unspecified data bits should be ignored. Operation Address DQ7 DQ6 DQ5 DQ3 DQ2 RB Program Any Address DQ7 Toggle 0 – – 0 Program During Erase Suspend Any Address DQ7 Toggle 0 – – 0 Program Error Any Address DQ7 Toggle 1 – – 0 Chip Erase Any Address 0 Toggle 0 1 Toggle 0 Block Erase before timeout Erasing Block 0 Toggle 0 0 Toggle 0 Non-Erasing Block 0 Toggle 0 0 No Toggle 0 Block Erase Erasing Block 0 Toggle 0 1 Toggle 0 Non-Erasing Block 0 Toggle 0 1 No Toggle 0 Erase Suspend Erasing Block 1 No Toggle 0 – Toggle 1 Non-Erasing Block Data read as normal 1 Erase Error Good Block Address 0 Toggle 1 1 No Toggle 0 Faulty Block Address 0 Toggle 1 1 Toggle 0 |
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