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M28W320EBB10N1 Datasheet(PDF) 11 Page - STMicroelectronics |
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M28W320EBB10N1 Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 45 page  11/45 M28W320EBT, M28W320EBB COMMAND INTERFACE All Bus Write operations to the memory are inter- preted by the Command Interface. Commands consist of one or more sequential Bus Write oper- ations. An internal Program/Erase Controller han- dles all timings and verifies the correct execution of the Program and Erase commands. The Pro- gram/Erase Controller provides a Status Register whose output may be read at any time, to monitor the progress of an operation, or the Program/ Erase states. See Table 3, Command Codes, for a summary of the commands and see Appendix D, Table 29, 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 Re- set or whenever VDD is lower than VLKO. Com- mand sequences must be followed exactly. Any invalid combination of commands will reset the de- vice to Read mode. Refer to Table 4, Commands, in conjunction with the text descriptions below. Read Memory Array command The Read command returns the memory to its Read mode. One Bus Write cycle is required to is- sue the Read Memory Array command and return the memory to Read mode. Subsequent read op- erations will read the addressed location and out- put the data. When a device Reset occurs, the memory defaults to Read mode. 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 8, Status Register Bits, for details on the definitions of the bits. The Read Status Register command may be is- sued at any time, even during a Program/Erase operation. Any Read attempt during a Program/ Erase operation will automatically output the con- tent of the Status Register. Read Electronic Signature Command The Read Electronic Signature command reads the Manufacturer and Device Codes. The Read Electronic Signature command consists of one write cycle, a subsequent read will output the Manufacturer or the Device Code depending on the levels of A0. The Manufacturer Code is out- put when the address line A0 is at VIL, the Device Code is output when A0 is at VIH. Addresses A1- A7 must be kept to VIL, other addresses are ig- nored. The codes are output on DQ0-DQ7 with DQ8-DQ15 at 00h. (see Table 5) Table 3. Command Codes Read CFI Query Command The Read Query Command is used to read data from the Common Flash Interface (CFI) Memory Area, allowing programming equipment or appli- cations to automatically match their interface to the characteristics of the device. One Bus Write cycle is required to issue the Read Query Command. Once the command is issued subsequent Bus Read operations read from the Common Flash Interface Memory Area. See Ap- pendix B, Common Flash Interface, Tables 23, 24, 25, 26, 27 and 28 for details on the information contained in the Common Flash Interface memory area. Block Erase Command The Block Erase command can be used to erase a block. It sets all the bits within the selected block to ’1’. All previous data in the block is lost. If the block is protected then the Erase operation will abort, the data in the block will not be changed and the Status Register will output the error. Two Bus Write cycles are required to issue the command. s The first bus cycle sets up the Erase command. s The second latches the block address in the internal state machine and starts the Program/ Erase Controller. If the second bus cycle is not Write Erase Confirm (D0h), Status Register bits b4 and b5 are set and the command aborts. Hex Code Command 10h Program 20h Erase 30h Double Word Program 40h Program 50h Clear Status Register 55h Reserved 56h Quadruple Word Program 70h Read Status Register 90h Read Electronic Signature 98h Read CFI Query B0h Program/Erase Suspend D0h Program/Erase Resume FFh Read Memory Array |
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