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M29F200B Datasheet(PDF) 8 Page - STMicroelectronics |
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M29F200B Datasheet(HTML) 8 Page - STMicroelectronics |
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8 / 33 page  Block Temporary Unprotection. Any previously protected block can be temporarily unprotected in order to change stored data. The temporary unpro- tection mode is activated by bringing RP to VID. During the temporary unprotection mode the pre- viously protected blocks are unprotected. A block can be selected and data can be modified by executing the Erase or Program instruction with the RP signal held at VID. When RP is returned to VIH, all the previously protected blocks are again pro- tected. Block Unprotection. All protected blocks can be unprotected on programming equipment to allow updating of bit contents. All blocks must first be protected before the unprotection operation. Block unprotection is activated when A9, G and E are at VID and A12, A15 at VIH. The Block Unprotection algorithm is shown in Figure 15. Unprotection is initiated by the edge of W falling to VIL. After a delay of 10ms, the unprotection operation will end. Un- protectionverify is achieved by bringing G and E to VIL while A0 is at VIL, A6 and A1 are at VIH and A9 remains at VID. In these conditions, reading the output data will yield 00h if the block defined by the inputs A12-A16 has been succesfully unprotected. Each block must be separatelyverified by giving its address in order to ensure that it has been unpro- tected. 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 addressand data sequences. The instruc- tions require from 1 to 6 cycles,the first or first three of which are always write operationsused to initiate the instruction. They are followed by either further write cycles to confirm the first command or exe- cute 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. Instructions are initialised by two initial Coded cy- cles which unlock the Command Interface. In addi- tion, for Erase, instruction confirmation is again preceded 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 9 and 10. 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 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 valueon 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. 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 Table 7. Commands 8/33 M29F200T, M29F200B |
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