P r e l i m i n a r y
data pairs must fall within the selected-write-buffer-page. The system then
writes the remaining address/data pairs into the write buffer. Write buffer loca-
tions may be loaded in any order.
The write-buffer-page address 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 pages.) This also means that Write Buffer Program-
ming cannot be performed across multiple sectors. If the system attempts to load
programming data outside of the selected write-buffer page, the operation will
abort.
Note that if a Write Buffer address location is loaded multiple times, the address/
data pair counter will be decremented for every data load operation. The host
system must therefore account for loading a write-buffer location more than
once. The counter decrements for each data load operation, not for each unique
write-buffer-address location. Note also that if an address location is loaded more
than once into the buffer, the final data loaded for that address will be
programmed.
Once the specified 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 and data combination aborts the Write Buffer Programming oper-
ation. The device then begins programming. Data polling should be used while
monitoring the last address location loaded into the write buffer. DQ7, DQ6, DQ5,
and DQ1 should be monitored to determine the device status during Write Buffer
Programming.
The write-buffer programming operation can be suspended using the standard
program suspend/resume commands. Upon successful completion of the Write
Buffer Programming operation, the device is ready to execute the next command.
The Write Buffer Programming Sequence can be aborted in the following ways:
Load a value that is greater than the page buffer size during the Number of
Locations to Program step.
Write to an address in a sector 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 se-
lected 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.
The abort condition is indicated by DQ1 = 1, DQ7 = DATA# (for the last address
location loaded), DQ6 = toggle, and DQ5=0. A Write-to-Buffer-Abort Reset com-
mand sequence must be written to reset the device for the next operation.
Note that the SecSi Sector, autoselect, and CFI functions are unavailable when a
program operation is in progress.This flash device is capable of handling multiple
write buffer programming operations on the same write buffer address range
without intervening erases. For applications requiring incremental bit program-
ming, a modified programming method is required; please contact your local
Spansion representative. Any bit in a write buffer address range cannot be
programmed from “0” back to a “1.” Attempting to do so may cause the de-
vice to set DQ5=1, of cause the DQ7 and DQ6 status bits to indicate the operation
was successful. However, a succeeding read will show that the data is still “0.”
Only erase operations can convert a “0” to a “1.”
April 30, 2004 S29GLxxxM_00A5
S29GLxxxM MirrorBitTM Flash Family
105
SPANSION [ SPANSION ]
