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M29W400B-100ZA5R Datasheet(PDF) 11 Page - STMicroelectronics |
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M29W400B-100ZA5R Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 34 page DQ Name Logic Level Definition Note 7 Data Polling ’1’ Erase Complete or erase block in Erase Suspend Indicates the P/E.C. status, check during Program or Erase, and on completion before checking bits DQ5 for Program or Erase Success. ’0’ Erase On-going DQ Program Complete or data of non erase block during Erase Suspend DQ Program On-going 6 Toggle Bit ’-1-0-1-0-1-0-1-’ Erase or Program On-going Successive reads output complementary data on DQ6 while Programming or Erase operations are on-going. DQ6 remains at constant level when P/E.C. operations are completed or Erase Suspend is acknowledged. DQ Program Complete ’-1-1-1-1-1-1-1-’ Erase Complete or Erase Suspend on currently addressed block 5 Error Bit ’1’ Program or Erase Error This bit is set to ’1’ in the case of Programming or Erase failure. ’0’ Program or Erase On-going 4 Reserved 3 Erase Time Bit ’1’ Erase Timeout Period Expired P/E.C. Erase operation has started. Only possible command entry is Erase Suspend (ES). ’0’ Erase Timeout Period On-going An additional block to be erased in parallel can be entered to the P/E.C. 2 Toggle Bit ’-1-0-1-0-1-0-1-’ Chip Erase, Erase or Erase Suspend on the currently addressed block. Erase Error due to the currently addressed block (when DQ5 = ’1’). Indicates the erase status and allows to identify the erased block 1 Program on-going, Erase on-going on another block or Erase Complete DQ Erase Suspend read on non Erase Suspend block 1 Reserved 0 Reserved Notes: Logic level ’1’ is High, ’0’ is Low. -0-1-0-0-0-1-1-1-0- represent bit value in successive Read operations. Table 9. Status Register Bits that is after the fourth W pulse for programming or after the sixth W pulse for erase. It must be per- formed at the address being programmed or at an address within the block being erased. If all the blocks selected for erasure are protected, DQ7 will be set to ’0’ for about 100 µs, and then return to the previous addressed memory data value. See Fig- ure 11 for the Data Polling flowchart and Figure 10 for the Data Polling waveforms. DQ7 will also flag the Erase Suspend mode by switching from ’0’ to ’1’ at the start of the Erase Suspend. In order to monitor DQ7 in the Erase Suspend mode an ad- dress within a block being erased must be pro- vided. For a Read Operation in Erase Suspend mode, DQ7 will output ’1’ if the read is attempted on a blockbeing erasedand the data value on other blocks. During Program operation in Erase Sus- pend Mode, DQ7 will have the same behaviour as in the normal program execution outside of the suspend mode. 11/34 M29W400T, M29W400B |
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