M29W128 View Datasheet(PDF) - Numonyx -> Micron

Part Name

Description

Manufacturer

M29W128

128 Mbit 3V Supply Flash Memory

Numonyx -> Micron 

M29W128FH, M29W128FL

Command interface

5.2.2

5.2.3

5.2.4

Use N Bus Write cycles to load the address and data for each Word/Byte into the Write

Buffer. Addresses must lie within the range from the start address+1 to the start address +

N-1. Optimum performance is obtained when the start address corresponds to a 64 Byte

boundary. If the start address is not aligned to a 64 Byte boundary, the total programming

time is doubled.

All the addresses used in the Write to Buffer and Program operation must lie within the

same page.

To program the content of the Write Buffer, this command must be followed by a Write to

Buffer and Program Confirm command.

If an address is written several times during a Write to Buffer and Program operation, the

address/data counter will be decremented at each data load operation and the data will be

programmed to the last word loaded into the Buffer.

Invalid address combinations or failing to follow the correct sequence of Bus Write cycles

will abort the Write to Buffer and Program.

The Status Register bits DQ1, DQ5, DQ6, DQ7 can be used to monitor the device status

during a Write to Buffer and Program operation.

If is not possible to detect Program operation fails when changing programmed data from ‘0’

to ‘1’, that is when reprogramming data in a portion of memory already programmed. The

resulting data will be the logical OR between the previous value and the current value.

A Write to Buffer and Program Abort and Reset command must be issued to abort the Write

to Buffer and Program operation and reset the device in Read mode.

See Appendix E, Figure 22: Write to Buffer and Program flowchart and Pseudo Code, for a

suggested flowchart on using the Write to Buffer and Program command.

Write to Buffer and Program Confirm command

The Write to Buffer and Program Confirm command is used to confirm a Write to Buffer and

Program command and to program the N+1 Words/Bytes loaded in the Write Buffer by this

command.

Write to Buffer and Program Abort and Reset command

The Write to Buffer and Program Abort and Reset command is used to abort Write to Buffer

and Program command.

Double Word Program command

This is used to write two adjacent Words in x16 mode, simultaneously. The addresses of the

two Words must differ only in A0.

Three bus write cycles are necessary to issue the command:

1. The first bus cycle sets up the command.

2. The second bus cycle latches the Address and the Data of the first Word to be written.

3. The third bus cycle latches the Address and the Data of the second Word to be written

and starts the Program/Erase Controller.

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