M29DW128F60NF6F datasheet(28/94 Pages) STMICROELECTRONICS

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Command interface

M29DW128F

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6.1.3

Read CFI Query command

The Read CFI Query Command is used to put the addressed bank in Read CFI Query

mode. Once in Read CFI Query mode Bus Read operations to the same bank will output

data from the Common Flash Interface (CFI) Memory Area. If the read operations are to a

different bank from the one specified in the command then the read operations will output

the contents of the memory array and not the CFI data.

One Bus Write cycle is required to issue the Read CFI Query Command. Care must be

taken to issue the command to one of the banks (A22-A19) along with the address shown in

Table 3 and Table 6. Once the command is issued subsequent Bus Read operations in the

same bank (A22-A19) to the addresses shown in Appendix B: Common Flash Interface

(CFI) (A7-A0), will read from the Common Flash Interface Memory Area.

This command is valid only when the device is in the Read Array or Auto Select mode. To

enter Read CFI query mode from Auto Select mode, the Read CFI Query command must

be issued to the same bank address as the Auto Select command, otherwise the device will

not enter Read CFI Query mode.

The Read/Reset command must be issued to return the device to the previous mode (the

Read Array mode or Auto Select mode). A second Read/Reset command is required to put

the device in Read Array mode from Auto Select mode.

See Appendix B, Table 35, Table 36, Table 37, Table 38, Table 39 and Table 40 for details on

the information contained in the Common Flash Interface (CFI) memory area.

6.1.4

Blank Verify command

The Blank Verify command is used to check if a block is blank or in other words, if it has

been successfully erased and all its bits set to '1'. Three cycles are required to issue a Verify

command:

The command starts with two unlock cycles.

The third bus write cycle sets up the Verify command code along with the address of

the block to be checked.

Bus Read operations during the Blank Verify operation output the Status Register on

Data Inputs/Outputs (see 7: Status Register).

After the Blank Verify command has completed, the memory returns to Read mode, unless

an error has occurred. When an error occurs, the memory continues to output the Status

Read mode.F

6.1.5

Chip Erase command

The Chip Erase command can be used to erase the entire chip. Six Bus Write operations

are required to issue the Chip Erase Command and start the Program/Erase Controller.

If any blocks are protected, then these are ignored and all the other blocks are erased. If all

of the blocks are protected the Chip Erase operation appears to start but will terminate

within about 100µs, leaving the data unchanged. No error condition is given when protected

blocks are ignored.

During the erase operation the memory will ignore all commands, including the Erase

Suspend command. It is not possible to issue any command to abort the operation. Typical

chip erase times are given in Table 18. All Bus Read operations during the Chip Erase

M29DW128F60NF6F Datasheet(PDF) 28 Page - STMicroelectronics

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