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M29W800AT Datasheet(PDF) 9 Page - STMicroelectronics |
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M29W800AT Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 33 page  9/33 M29W800AT, M29W800AB Table 8. Commands Hex Code Command 00h Invalid/Reserved 10h Chip Erase Confirm 20h Reserved 30h Block Erase Resume/Confirm 80h Set-up Erase 90h Read Electronic Signature/ Block Protection Status A0h Program B0h Erase Suspend F0h Read Array/Reset INSTRUCTIONS AND COMMANDS The Command Interface latches commands writ- ten to the memory. Instructions are made up from one or more commands to perform Read Memory Array, Read Electronic Signature, Read Block Pro- tection, Program, Block Erase, Chip Erase, Erase Suspend and Erase Resume. Commands are made of address and data sequences. The in- structions require from 1 to 6 cycles, the first or first three of which are always write operations used to initiate the instruction. They are followed by either further write cycles to confirm the first command or execute the command immediately. Command se- quencing must be followed exactly. Any invalid combination of commands will reset the device to Read Array. The increased number of cycles has been chosen to assure maximum data security. In- structions are initialised by two initial Coded cycles which unlock the Command Interface. In addition, for Erase, instruction confirmation is again preced- ed by the two Coded cycles. Status Register Bits P/E.C. status is indicated during execution by Data Polling on DQ7, detection of Toggle on DQ6 and DQ2, or Error on DQ5 and Erase Timer DQ3 bits. Any read attempt during Program or Erase com- mand execution will automatically output these five Status Register bits. The P/E.C. automatically sets bits DQ2, DQ3, DQ5, DQ6 and DQ7. Other bits (DQ0, DQ1 and DQ4) are reserved for future use and should be masked. See Tables 10 and 11. Data Polling Bit (DQ7). When Programming op- erations are in progress, this bit outputs the com- plement of the bit being programmed on DQ7. During Erase operation, it outputs a ’0’. After com- pletion of the operation, DQ7 will output the bit last programmed or a ’1’ after erasing. Data Polling is valid and only effective during P/E.C. operation, 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 13 for the Data Polling flowchart and Figure 12 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 provid- ed. For a Read Operation in Erase Suspend mode, DQ7 will output ’1’ if the read is attempted on a block being erased and the data value on oth- er blocks. During Program operation in Erase Sus- pend Mode, DQ7 will have the same behavior as in the normal program execution outside of the suspend mode. Toggle Bit (DQ6). When Programming or Eras- ing operations are in progress, successive at- tempts to read DQ6 will output complementary data. DQ6 will toggle following toggling of either G, or E when G is low. The operation is completed when two successive reads yield the same output data. The next read will output the bit last pro- grammed or a ’1’ after erasing. The toggle bit DQ6 is valid only during P/E.C. operations, that is after the fourth W pulse for programming or after the sixth W pulse for Erase. If the blocks selected for erasure are protected, DQ6 will toggle for about 100 µs and then return back to Read. DQ6 will be set to ’1’ if a Read operation is attempted on an Erase Suspend block. When erase is suspended DQ6 will toggle during programming operations in a block different to the block in Erase Suspend. Ei- ther E or G toggling will cause DQ6 to toggle. See Figure 14 for Toggle Bit flowchart and Figure 15 for Toggle Bit waveforms. |
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