M29F800DB datasheet(19/53 Pages) STMICROELECTRONICS

19 / 53 page

M29F800DT

Command Interface

19/53

4.0.9

Erase Suspend command

The Erase Suspend command may be used to temporarily suspend a Block Erase operation

and return the memory to Read mode. The command requires one Bus Write operation.

The Program/Erase Controller will suspend within the Erase Suspend Latency Time (refer to

Table 6 for value) of the Erase Suspend command being issued. Once the Program/Erase

Controller has stopped the memory will be set to Read mode and the Erase will be

suspended. If the Erase Suspend command is issued during the period when the memory is

waiting for an additional block (before the Program/Erase Controller starts) then the Erase is

suspended immediately and will start immediately when the Erase Resume command is

issued. It is not possible to select any further blocks to erase after the Erase Resume.

During Erase Suspend it is possible to Read and Program cells in blocks that are not being

erased; both Read and Program operations behave as normal on these blocks. If any

attempt is made to program in a protected block or in the suspended block then the Program

command is ignored and the data remains unchanged. The Status Register is not read and

no error condition is given. Reading from blocks that are being erased will output the Status

It is also possible to issue the Auto Select, Read CFI Query and Unlock Bypass commands

during an Erase Suspend. The Read/Reset command must be issued to return the device to

Read Array mode before the Resume command will be accepted.

4.0.10

Erase Resume command

The Erase Resume command must be used to restart the Program/Erase Controller from

Erase Suspend. An erase can be suspended and resumed more than once.

4.0.11

Read CFI Query command

The Read CFI Query Command is used to read data from the Common Flash Interface

(CFI) Memory Area. This command is valid when the device is ready to read the array data

or when the device is in autoselected mode.

One Bus Write cycle is required to issue the Read CFI Query Command. Once the

command is issued subsequent Bus Read operations read from the Common Flash

Interface Memory Area. The Read/Reset command must be issued to return the device to

Read Array mode. See Appendix B, Table 21, Table 22, Table 23, Table 24, Table 25, and

Appendix B: Common Flash Interface (CFI), for details on the information contained in the

Common Flash Interface (CFI) memory area.

4.0.12

Block Protect and Chip Unprotect commands

Each block can be separately protected against accidental Program or Erase. The whole

chip can be unprotected to allow the data inside the blocks to be changed.

Block Protect and Chip Unprotect operations are described in Appendix C.

M29F800DB 数据表(PDF) 19 Page - STMicroelectronics

M29F800DB 数据表(HTML) 19 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

数据表下载