m29dw256g Numonyx, m29dw256g Datasheet - Page 36

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

Table 12.
1.
2.
3.
4.
5.
6.
36/84
Write to Buffer Program
Unlock Bypass Write to Buffer
Program
Write to Buffer Program
Confirm
Buffered Program Abort Reset
X don’t care, PA program address, PD program data, BAd any address in the block, WBL write buffer location. All values in the table are in
hexadecimal.
The maximum number of cycles in the command sequence is 36. N+1 is the number of words to be programmed during the write to buffer
program operation.
Each buffer has the same A23-A5 addresses. A0-A4 are used to select a word within the N+1 word page.
The 6th cycle has to be issued N time. WBL scans the word inside the page.
BAd must be identical to the address loaded during the write to buffer program 3rd and 4th cycles.
The 4th cycle has to be issued N time. WBL scans the word inside the page.
Command
Write to buffer commands
Buffered Program Abort Reset command
A Buffered Program Abort Reset command must be issued to reset the error condition and
return to read mode. One of the erase commands must be used to set all the bits in a block
or in the whole memory from '0' to '1'.
The write to buffer programming sequence can be aborted in the following ways:
The abort condition is indicated by DQ1 = 1, DQ6 = toggle, and DQ5 = 0 (all of which are
status register bits). A Buffered Program Abort and Reset command sequence must be
written to reset the device for the next operation. Note that the full 3-cycle Buffered Program
Abort and Reset command sequence is required when using write to buffer and enhanced
buffered programming features in unlock bypass mode.
See
suggested flowchart on using the Write to Buffer Program command.
Appendix
Load a value that is greater than the page buffer size during the number of locations to
program step in the Write to Buffer Program command.
Write to an address in a block different than the one specified during the write-buffer
load command.
Write an address/data pair to a different write-buffer-page than the one selected by the
starting address during the write buffer data loading stage of the operation.
Write data other than the Confirm command after the specified number of data load
cycles.
Load address/data pairs in an incorrect sequence during the enhanced buffered
program.
D,
Figure 25: Write to buffer program flowchart and
N+5
N+3
1
3
Add
BAd
BAd
555
555
(5)
1st
Data
AA
AA
25
29
Add
2AA
BAd
2AA
2nd
Data
N
55
55
(2)
Bus write operations
Add
BAd
555
PA
(3)
3rd
Data
PD
25
F0
WBL
Add
BAd
(6)
4th
Data
N
PD
(2)
(1)
pseudocode, for a
PA
Add
(3)
5th
Data
PD
WBL
Add
(4)
6th
Data
PD