M29F200BB データシートの表示（PDF） - Micron Technology

部品番号

コンポーネント説明

メーカー

M29F200BB

2 Mbit 256Kb x8 or 128Kb x16 / Boot Block Single Supply Flash Memory

Micron Technology 

Command interface

M29F200BT, M29F200BB

4.0.8

4.0.9

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

previous data is lost.

Block Erase command

The Block Erase command can be used to erase a list of one or more blocks. 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 about 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. The Status Register

can be read after the sixth Bus Write operation. See the Status Register for details on how

to identify if the Program/Erase Controller has started the Block Erase operation.

If any selected blocks are protected then these are ignored and all the other selected blocks

are erased. If all of the selected blocks are protected the Block 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 Block Erase operation the memory will ignore all commands except the Erase

Suspend and Read/Reset commands. Typical block erase times are given in Table 6. All

Bus Read operations during the Block Erase operation will output the Status Register on the

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

After the Block 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 Register. A Read/Reset command must be issued to reset the error condition and

return to Read mode.

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

previous data in the selected blocks is lost.

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 15µs 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 will not be possible to select

any further blocks for erasure 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. Reading

from blocks that are being erased will output the Status Register. It is also possible to enter

the Auto Select mode: the memory will behave as in the Auto Select mode on all blocks until

a Read/Reset command returns the memory to Erase Suspend mode.

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