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M28W320FCT Datasheet(PDF) 16 Page - Numonyx B.V |
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M28W320FCT Datasheet(HTML) 16 Page - Numonyx B.V |
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16 / 69 page  Command interface M28W320FCT, M28W320FCB 16/69 4 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. An internal Program/Erase Controller handles all timings and verifies the correct execution of the Program and Erase commands. The Program/Erase Controller provides a Status Register whose output may be read at any time during, to monitor the progress of the operation, or the Program/Erase states. See Table 3: Command Codes, for a summary of the commands and see Appendix D, and Table 32, Write State Machine Current/Next, for a summary of the Command Interface. The Command Interface is reset to Read mode when power is first applied, when exiting from Reset or whenever VDD is lower than VLKO. Command sequences must be followed exactly. Any invalid combination of commands will reset the device to Read mode. Refer to Table 4: Commands, in conjunction with the text descriptions below. 4.1 Read Memory Array command The Read command returns the memory to its Read mode. One Bus Write cycle is required to issue the Read Memory Array command and return the memory to Read mode. Subsequent read operations will read the addressed location and output the data. When a device Reset occurs, the memory defaults to Read mode. 4.2 Read Status Register command The Status Register indicates when a program or erase operation is complete and the success or failure of the operation itself. Issue a Read Status Register command to read the Status Register’s contents. Subsequent Bus Read operations read the Status Register at any address, until another command is issued. See Table 11: Status Register Bits, for details on the definitions of the bits. The Read Status Register command may be issued at any time, even during a Program/Erase operation. Any Read attempt during a Program/Erase operation will automatically output the content of the Status Register. |
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