M29DW128F datasheet(28/93 Pages) STMICROELECTRONICS

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6 Command Interface

M29DW128F

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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

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 operation will output

the Status Register on the Data Inputs/Outputs. See the section on the Status Register for

more details.

After the Chip Erase operation has completed the memory will return to the Read mode, unless

an error has occurred. When an error occurs the memory will continue to output the Status

Read mode.

The Chip Erase Command sets all of the bits in unprotected blocks of the memory to ’1’. All

previous data is lost.

6.1.5

Block Erase command

The Block Erase command can be used to erase a list of one or more blocks in one or more

Banks. It sets all of the bits in the unprotected selected blocks to ’1’. All previous data in the

selected blocks is lost.

Six Bus Write operations are required to select the first block in the list. Each additional block in

the list can be selected by repeating the sixth Bus Write operation using the address of the

additional block. The Block Erase operation starts the Program/Erase Controller after a time-

out period of 50µs after the last Bus Write operation. Once the Program/Erase Controller starts

it is not possible to select any more blocks. Each additional block must therefore be selected

within 50µs of the last block. The 50µs timer restarts when an additional block is selected. After

the sixth Bus Write operation a Bus Read operation within the same Bank will output the Status

Controller has started the Block Erase operation.

M29DW128F Datasheet(PDF) 28 Page - STMicroelectronics

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