m29dw256g Numonyx, m29dw256g Datasheet - Page 37

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

6.3.2
Enhanced Buffered Program command set
Enhanced Buffered Entry command
Enhanced Buffered Entry command is used in order to allow the execution of the Enhanced
Buffered Program. Once issued the Enhanced Buffered Entry Command, it is possible to
execute Enhanced Buffered Program Command more then one time; there is no need to
repeat it again.
After an Enhanced Buffered Entry Command only the commands belonging to the
Enhanced Buffered Program command set are accepted. Enhanced Buffered Program
command set is listed below:
After these commands any other command is ignored.
In order to be sure that the Entry procedure has successfully completed and the device is
ready to receive one of the commands listed above it is recommended to monitor toggle bit
(DQ6), see
Enhanced Buffered Exit command
The Enhanced Buffered Exit command is used to return the device to read mode; before
this command any other command, except the Enhanced Buffered Program command set,
is ignored. Two bus write operations are required to issue the command.
Enhanced Buffered Program command
The Enhanced Buffered Program command makes use of the device's 256-word write buffer
to speed up programming. 256 words can be loaded into the write buffer. Each write buffer
has the same A23-A8 addresses. The Enhanced Buffered Program command dramatically
reduces system programming time compared to both the standard non-buffered Program
command and the Write to Buffer command.
When issuing an Enhanced Buffered Program command, the VPP/WP pin can be either
held High, VIH, or raised to VPPH (see
endurance cycles
(See
Note that address/data cycles must be loaded in an increasing address order (from
ADD[7:0]=00000000 to ADD[7:0]=11111111) and completely (all 256 words). Invalid address
Enhanced Buffered Program command
Enhanced Buffered Program Abort Reset
Enhanced Buffered Program Exit
Enhanced Buffered Program command is accepted only after Enhanced Buffered Entry
command.
Only one bus write cycle is needed to set up the Enhanced Buffered Program
command. The setup code can be addressed to any location within the targeted block.
The second bus write cycle loads the first address and data to be programmed. There
a total of 256 address and data loading cycles.
Once the 256 words are loaded to the buffer a further bus write is needed to program
the content of the write buffer.
Once Enhanced Buffered Program is completed Enhanced Buffered Exit command is
required to return to read mode.
Table 13: Enhanced buffered program commands
Figure 9: Data toggle
for details on typical enhanced buffered program times in both cases).
flowchart.
Table 15: Program/erase times and program/erase
for more details);
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