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參數(shù)資料
| 型號： | AM29LV640MT |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit⑩ 3.0 Volt-only Boot Sector Flash Memory |
| 中文描述： | 64兆位（4個M x 16位/八米× 8位）的MirrorBit⑩3.0伏，只引導扇區(qū)閃存 |
| 文件頁數(shù)： | 43/66頁 |
| 文件大小： | 836K |
| 代理商： | AM29LV640MT |
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February1,2007 26190C8
Am29LV640MT/B
41
D A T A S H E E T
other system tasks. In this case, the system must start
at the beginning of the algorithm when it returns to de-
termine the status of the operation (top of
Figure 9
).
DQ5: Exceeded Timing Limits
DQ5 indicates whether the program, erase, or
write-to-buffer 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 suc-
cessfully completed.
The device might 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 halts the operation, and when the timing limit
has been exceeded, DQ5 produces a “1.”
In all these cases, the system must write the reset
command to return the device to the reading the array
(or to erase-suspend-read if the device was previously
in the erase-suspend-program mode).
DQ3: Sector Erase Timer
After writing a sector erase command sequence, the
system can 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 com-
mand. When the time-out period is complete, DQ3
switches from a “0” to a “1.” If the time between addi-
tional sector erase commands from the system can be
assumed to be less than 50 μs, the system need not
monitor DQ3. See also
Sector Erase Command Se-
quence on page 33
.
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 fur-
ther 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 subsequent sector erase command. If
DQ3 is high on the second status check, the last com-
mand might not have been accepted.
Table 14
shows the status of DQ3 relative to the other
status bits.
DQ1: Write-to-Buffer Abort
DQ1 indicates whether a Write-to-Buffer operation
was aborted. Under these conditions DQ1 produces a
“1”.
The
system
Write-to-Buffer-Abort-Reset command sequence to re-
turn the device to reading array data. See
Write Buffer
Programming on page 29
for more details.
must
issue
the
Table 14.
Write Operation Status
Notes:
1. DQ5 switches to ‘1’ when an Embedded Program, Embedded Erase, or Write-to-Buffer operation has exceeded the
maximum timing limits. See
DQ5: Exceeded Timing Limits
for more information.
2. DQ7 and DQ2 require a valid address when reading status information. Refer to the appropriate subsection for further details.
3. The Data# Polling algorithm should be used to monitor the last loaded write-buffer address location.
4. DQ1 switches to ‘1’ when the device has aborted the write-to-buffer operation.
Status
DQ7
(Note 2)
DQ7#
0
DQ6
Toggle
Toggle
DQ5
(Note 1)
0
0
DQ3
N/A
1
DQ2
(Note 2)
No toggle
Toggle
DQ1
0
N/A
RY/BY#
0
0
Standard
Mode
Embedded Program Algorithm
Embedded Erase Algorithm
Program-Suspended
Sector
Non-Program
Suspended Sector
Erase-Suspended
Sector
Non-Erase Suspended
Sector
Erase-Suspend-Program
(Embedded Program)
Busy
(Note 3)
Abort
(Note 4)
Program
Suspend
Mode
Program-
Suspend
Read
Invalid (not allowed)
1
Data
1
Erase
Suspend
Mode
Erase-
Suspend
Read
1
No toggle
0
N/A
Toggle
N/A
1
Data
1
DQ7#
Toggle
0
N/A
N/A
N/A
0
Write-to-
Buffer
DQ7#
DQ7#
Toggle
Toggle
0
0
N/A
N/A
N/A
N/A
0
1
0
0
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