參數(shù)資料
型號(hào)： S29GL128N11FFIVH2
廠商： SPANSION LLC
元件分類： PROM
英文描述： 16M X 16 FLASH 3V PROM, 110 ns, PBGA64
封裝： 10 X 13 MM, 1 MM PITCH, LEAD FREE, FBGA-64
文件頁數(shù)： 32/74頁
文件大?。?/td> 1593K
代理商： S29GL128N11FFIVH2
36
S29GL-N
S29GL-N_01_A0 May 1, 2006
Da ta
Sh e e t
10.5.1
Unlock Bypass Command Sequence
The unlock bypass feature allows the system to program words to the device faster than using the standard
program command sequence. The unlock bypass command sequence is initiated by first writing two unlock
cycles. This is followed by a third write cycle containing the unlock bypass command, 20h. The device then
enters the unlock bypass mode. A two-cycle unlock bypass program command sequence is all that is
required to program in this mode. The first cycle in this sequence contains the unlock bypass program
command, A0h; the second cycle contains the program address and data. Additional data is programmed in
the same manner. This mode dispenses with the initial two unlock cycles required in the standard program
command sequence, resulting in faster total programming time. Table 11.1 on page 46 and Table 11.3
on page 48 show the requirements for the command sequence.
During the unlock bypass mode, only the Unlock Bypass Program and Unlock Bypass Reset commands are
valid. To exit the unlock bypass mode, the system must issue the two-cycle unlock bypass reset command
10.5.2
Write Buffer Programming
Write Buffer Programming allows the system write to a maximum of 16 words/32 bytes in one programming
operation. This results in faster effective programming time than the standard 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. The fourth cycle writes the sector address and the number of word locations, minus
one, to be programmed. For example, if the system programs six unique address locations, then 05h should
be written to the device. This tells the device how many write buffer addresses are loaded with data and
therefore when to expect the Program Buffer to Flash command. The number of locations to program cannot
exceed the size of the write buffer or the operation aborts.
The fifth cycle writes the first address location and data to be programmed. The write-buffer-page is selected
by address bits AMAX–A4. All subsequent address/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 locations 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 Programming cannot be performed across multiple sectors. If the system attempts to load
programming data outside of the selected write-buffer page, the operation aborts.)
Note that if a Write Buffer address location is loaded multiple times, the address/data pair counter is
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 is 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 operation. 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 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.
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