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M29DW641F Datasheet(PDF) 25 Page - Numonyx B.V |
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M29DW641F Datasheet(HTML) 25 Page - Numonyx B.V |
25 / 80 page ![]() M29DW641F Command interface 25/80 6 Command interface All Bus Write Operations to the memory are interpreted by the Command Interface. Commands consist of one or more sequential Bus Write Operations. Failure to observe a valid sequence of Bus Write Operations will result in the memory returning to Read mode. The long command sequences are imposed to maximize data security. 6.1 Standard commands See Table 8: Standard commands for a summary of the Standard commands. 6.1.1 Read/Reset command The Read/Reset command returns the memory to Read mode. It also resets the errors in the Status Register. Either one or three Bus Write Operations can be used to issue the Read/Reset command. The Read/Reset command can be issued, between Bus Write cycles before the start of a Program or Erase Operation, to return the device to Read mode. If the Read/Reset command is issued during the time-out of a Block Erase Operation, the memory will take up to 10µs to abort. During the abort period no valid data can be read from the memory. The Read/Reset command will not abort an Erase Operation when issued while in Erase Suspend. 6.1.2 Auto Select command The Auto Select command is used to read the Manufacturer Code, the Device Code, the Protection status of each block (Block Protection status) and the Extended Block Protection indicator. It can be addressed to either Bank. Three consecutive Bus Write Operations are required to issue the Auto Select command. Once the Auto Select command is issued, Bus Read Operations to specific addresses output the Manufacturer Code, the Device Code, the Extended Block Protection indicator and a Block Protection status (see Table 8: Standard commands in relation with Table 4 and Table 5). The memory remains in Auto Select mode until a Read/Reset or CFI Query command is issued. |
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