s71pl512nd0 Meet Spansion Inc., s71pl512nd0 Datasheet - Page 26

• Manufacturer Part Number: s71pl512nd0
• Description: Two S29pl256n Devices 32 M X 16-bit Cmos 3.0-volt Only Simultaneous Read/write, Page-mode Flash Memory
• Manufacturer: Meet Spansion Inc.

24
9.4.2 Write Buffer Programming
Write Buffer Programming allows the system to write a maximum of 32 words in one program-
ming operation. This results in a faster effective word programming time than the standard word
programming algorithms. The Write Buffer Programming command sequence is initiated by first
writing two unlock cycles. This is followed by a third write cycle containing the Write Buffer Load
command written at the Sector Address in which programming occurs. At this point, the system
writes the number of word locations minus 1 that is loaded into the page buffer at the Sector Ad-
dress in which programming occurs. This tells the device how many write buffer addresses are
loaded with data and therefore when to expect the Program Buffer to Flash confirm command.
The number of locations to program cannot exceed the size of the write buffer or the operation
aborts. (Number loaded = the number of locations to program minus 1. For example, if the sys-
tem programs 6 address locations, then 05h should be written to the device.)
The system then writes the starting address/data combination. This starting address is the first
address/data pair to be programmed, and selects the write-buffer-page address. All subsequent
address/data pairs must fall within the elected-write-buffer-page.
The write-buffer-page is selected by using the addresses A
The write-buffer-page addresses must be the same for all address/data pairs loaded into the write
buffer. (This means Write Buffer Programming cannot be performed across multiple write-buffer-
page. This also means that Write Buffer Programming cannot be performed across multiple sec-
tors. If the system attempts to load programming data outside of the selected write-buffer-page,
the operation
After writing the Starting Address/Data pair, the system then writes the remaining address/data
pairs into the write buffer.
Note that if a Write Buffer address location is loaded multiple times, the address/ data pair counter
decrements for every data load operation. Also, the last data loaded at a location before the Pro-
gram Buffer to Flash confirm command is programmed into the device. The software takes care
of the ramifications of loading a write-buffer location more than once. The counter decrements
for each data load operation,
fied number of write buffer locations have been loaded, the system must then write the Program
Buffer to Flash command at the Sector Address. Any other address/data write combinations abort
the Write Buffer Programming operation. The device then goes busy. The Data Bar polling tech-
niques should be used while monitoring the last address location loaded into the write buffer. This
eliminates the need to store an address in memory because the system can load the last address
location, issue the program confirm command at the last loaded address location, and then data
bar poll at that same address.
The write-buffer embedded programming operation can be suspended using the standard sus-
pend/resume commands. Upon successful completion of the Write Buffer Programming operation,
the device returns to READ mode.
If the write buffer command sequence is entered incorrectly the device enters write buffer abort.
When an abort occurs the write-to buffer-abort reset command must be issued to return the de-
vice to read mode.
The Write Buffer Programming Sequence is
T Load a value that is greater than the page buffer size during the Number of Locations to Pro-
T Write to an address in a sector different than the one specified during the Write-Buffer-Load
T Write an Address/Data pair to a different write-buffer-page than the one selected by the
T Write data other than the Confirm Command after the specified number of data load cycles.
gram step.
command.
Starting Address during the write buffer data loading stage of the operation.
ABORTS
.)
S29PL-N MirrorBit™ Flash Family
NOT
for each unique write-buffer-address location. Once the speci-
P r e l i m i n a r y
ABORTED
under any of the following conditions:
max
– A5.
S29PL-N_M0_A4 November 23, 2005