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M29W800DT70N6 Datasheet(PDF) 12 Page - STMicroelectronics |
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M29W800DT70N6 Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 41 page  M29W800DT, M29W800DB 12/41 Table 3. Bus Operations, BYTE = VIH Note: X = VIL or VIH. 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. Failure to observe a valid sequence of Bus Write operations will result in the memory return- ing to Read mode. The long command sequences are imposed to maximize data security. The address used for the commands changes de- pending on whether the memory is in 16-bit or 8- bit mode. See either Table 4, or 5, depending on the configuration that is being used, for a summary of the commands. Read/Reset Command. The Read/Reset com- mand returns the memory to its Read mode where it behaves like a ROM or EPROM, unless other- wise stated. 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, be- tween Bus Write cycles before the start of a pro- gram or erase operation, to return the device to read mode. Once the program or erase operation has started the Read/Reset command is no longer accepted. The Read/Reset command will not abort an Erase operation when issued while in Erase Suspend. Auto Select Command. The Auto Select com- mand is used to read the Manufacturer Code, the Device Code and the Block Protection Status. Three consecutive Bus Write operations are re- quired to issue the Auto Select command. Once the Auto Select command is issued the memory remains in Auto Select mode until a Read/Reset command is issued. Read CFI Query and Read/ Reset commands are accepted in Auto Select mode, all other commands are ignored. From the Auto Select mode the Manufacturer Code can be read using a Bus Read operation with A0 = VIL and A1 = VIL. The other address bits may be set to either VIL or VIH. The Manufacturer Code for STMicroelectronics is 0020h. The Device Code can be read using a Bus Read operation with A0 = VIH and A1 = VIL. The other address bits may be set to either VIL or VIH. The Device Code for the M29W800DT is 22D7h and for the M29W800DB is 225Bh. The Block Protection Status of each block can be read using a Bus Read operation with A0 = VIL, A1 = VIH, and A12-A18 specifying the address of the block. The other address bits may be set to ei- ther VIL or VIH. If the addressed block is protect- ed then 01h is output on Data Inputs/Outputs DQ0-DQ7, otherwise 00h is output. Program Command. The Program command can be used to program a value to one address in the memory array at a time. The command re- quires four Bus Write operations, the final write op- eration latches the address and data in the internal state machine and starts the Program/Erase Con- troller. If the address falls in a protected block then the Program command is ignored, the data remains unchanged. The Status Register is never read and no error condition is given. During the program operation the memory will ig- nore all commands. It is not possible to issue any command to abort or pause the operation. Typical program times are given in Table 6. Bus Read op- erations during the program operation will output the Status Register on the Data Inputs/Outputs. See the section on the Status Register for more details. Operation E G W Address Inputs A0-A18 Data Inputs/Outputs DQ15A–1, DQ14-DQ0 Bus Read VIL VIL VIH Cell Address Data Output Bus Write VIL VIH VIL Command Address Data Input Output Disable X VIH VIH XHi-Z Standby VIH XX X Hi-Z Read Manufacturer Code VIL VIL VIH A0 = VIL, A1 = VIL, A9 = VID, Others VIL or VIH 0020h Read Device Code VIL VIL VIH A0 = VIH, A1 = VIL, A9 = VID, Others VIL or VIH 22D7h (M29W800DT) 225Bh (M29W800DB) |
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