m29dw256g Numonyx, m29dw256g Datasheet - Page 38

• Manufacturer Part Number: m29dw256g
• Description: 256-mbit X16, Multiple Bank, Page, Dual Boot 3 V Supply Flash Memory
• Manufacturer: Numonyx

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combinations or failing to follow the correct sequence of bus write cycles will abort the
enhanced buffered program.
The status register bits DQ1, DQ5, DQ6, and DQ7 can be used to monitor the device status
during an enhanced buffered program operation.
An external supply (12 V) can be used to improve programming efficiency.
It is 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 and the current value.
See
a suggested flowchart on using the Enhanced Buffered Program command.
Enhanced Buffered Program Abort Reset command
After an enhanced buffered program abort the memory does not accept any other
command; in order to reset the device from the abort must be issued an Enhanced Buffered
Program Abort Reset. After the Enhanced Buffered Program Abort Reset command the
memory waits for one of the Enhanced Buffered Program command set.
The enhanced buffered programming sequence can be aborted in the following ways:
Table 13.
The abort condition is indicated by DQ1 = 1, DQ6 = toggle, and DQ5 = 0 (all of which are
status register bits).
Enter Enhanced
Buffered Program
Command Set
Enhanced Buffered
Program
Exit Enhanced
Buffered Program
Command Set
Enhanced Buffered
Program Abort Reset
Appendix D
Command
Write to an address in a block different than the one specified during the buffer load.
Write an address/data pair to a different buffer-page than the one selected by the
starting address during the buffer data loading stage of the operation
Write data other than the Confirm command after the 256 data load cycles.
Load address/data pairs in an incorrect sequence during the enhanced buffered
program.
Load a number of data that is less or greater than 256 during the program step.
Enhanced buffered program commands
and
258 BAd
3
2
3
Figure 26: Enhanced buffered program flowchart and
Add
555
555
X
1st
Data
AA
AA
33
90
Add Data Add Data
2AA
BAd
2AA
(00)
X
2nd
Data
55
00
55
BAd
(01)
555
555
3rd
Data
38
F0
Bus write operations
Add
...
...
Data
...
Add
BAd
(FE)
256th
Data
Data
Add
BAd
(FF)
257th
pseudocode, for
Data
Data
Add
BAd
(00)
258th
Data
29