參數(shù)資料
型號(hào)： S29GL01GP90FAIR12
廠商： Spansion Inc.
英文描述： 3.0 Volt-only Page Mode Flash Memory featuring 90 nm MirrorBit Process Technology
中文描述： 3.0伏只頁面模式閃存具有90納米MirrorBit工藝技術(shù)
文件頁數(shù)： 39/77頁
文件大?。?/td> 2121K
代理商： S29GL01GP90FAIR12
November 8, 2007 S29GL-P_00_A7
S29GL-P MirrorBit
Flash Family
39
D a t a
S h e e t
( P r e l i m i n a r y )
this toggling behavior to be properly observed, the consecutive status bit reads must not be interleaved with
read accesses to other memory sectors. If it is not possible to temporarily prevent reads to other memory
sectors, then it is recommended to use the DQ7 status bit as the alternative method of determining the active
or inactive status of the write operation.
7.8.5
DQ5: Exceeded Timing Limits
DQ5 indicates whether the program or erase time has exceeded a specified internal pulse count limit. Under
these conditions DQ5 produces a “1,” indicating that the program or erase cycle was not successfully
completed. The device does not output a 1 on DQ5 if the system tries to program a 1 to a location that was
previously programmed to 0. Only an erase operation can change a 0 back to a 1. Under this condition, the
device ignores the bit that was incorrectly instructed to be programmed from a 0 to a 1, while any other bits
that were correctly requested to be changed from 1 to 0 are programmed. Attempting to program a 0 to a 1 is
masked during the programming operation. Under valid DQ5 conditions, the system must write the reset
command to return to the read mode (or to the erase-suspend-read mode if a sector was previously in the
erase-suspend-program mode).
7.8.6
DQ3: Sector Erase Timeout State Indicator
After writing a sector erase command sequence, the system may read DQ3 to determine whether or not
erasure has begun. (The sector erase timer does not apply to the chip erase command.) If additional sectors
are selected for erasure, the entire time-out also applies after each additional sector erase command. When
the time-out period is complete, DQ3 switches from a “0” to a “1.” If the time between additional sector erase
commands from the system can be assumed to be less than t
SEA
, then the system need not monitor DQ3.
See
Sector Erase
on page 30
for more details.
After the sector erase command is written, the system should read the status of DQ7 (Data# Polling) or DQ6
(Toggle Bit I) to ensure that the device has accepted the command sequence, and then read DQ3. If DQ3 is
“1,” the Embedded Erase algorithm has begun; all further commands (except Erase Suspend) are ignored
until the erase operation is complete. If DQ3 is “0,” the device accepts additional sector erase commands. To
ensure the command has been accepted, the system software should check the status of DQ3 prior to and
following each sub-sequent sector erase command. If DQ3 is high on the second status check, the last
command might not have been accepted.
Table 7.17
shows the status of DQ3 relative to the other status bits.
7.8.7
DQ1: Write to Buffer Abort
DQ1 indicates whether a Write to Buffer operation was aborted. Under these conditions DQ1 produces a “1”.
The system must issue the “Write to Buffer Abort Reset” command sequence to return the device to reading
array data. See
Write Buffer Programming
on page 26
for more details.
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