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參數(shù)資料
| 型號： | L6402ML11RI |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 128 Megabit (4 M x 32-Bit/8 M x 16-Bit) MirrorBit⑩ 3.0 Volt-only Uniform Sector Flash Memory with Versatile I/O⑩ Control |
| 中文描述： | 128兆位（4個M x 32位/八米x 16位），3.0伏的MirrorBit⑩只閃光均勻部門與通用的I / O控制記憶⑩ |
| 文件頁數(shù)： | 31/57頁 |
| 文件大?。?/td> | 433K |
| 代理商： | L6402ML11RI |
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January 23, 2006
Am29LV6402M
29
Chip Erase Command Sequence
Chip erase is a six bus cycle operation. The chip erase
command sequence is initiated by writing two unlock
cycles, followed by a set-up command. Two additional
unlock write cycles are then followed by the chip erase
command, which in turn invokes the Embedded Erase
algorithm. The device does
not
require the system to
preprogram prior to erase. The Embedded Erase algo-
rithm automatically preprograms and verifies the entire
memory for an all zero data pattern prior to electrical
erase. The system is not required to provide any con-
trols or timings during these operations. Tables
10
and
11
show the address and data requirements for the
chip erase command sequence.
When the Embedded Erase algorithm is complete, the
device returns to the read mode and addresses are no
longer latched. The system can determine the status
of the erase operation by using DQ7 and DQ15, DQ6
and DQ14, or DQ2 and DQ10. Refer to the Write Op-
eration Status section for information on these status
bits.
Any commands written during the chip erase operation
are ignored. However, note that a
hardware reset
im-
mediately terminates the erase operation. If that oc-
curs, the chip erase command sequence should be
reinitiated once the device has returned to reading
array data, to ensure data integrity.
Figure 7 illustrates the algorithm for the erase opera-
tion. Refer to the Erase and Program Operations ta-
bles in the AC Characteristics section for parameters,
and Figure 19 section for timing diagrams.
Sector Erase Command Sequence
Sector erase is a six bus cycle operation. The sector
erase command sequence is initiated by writing two
unlock cycles, followed by a set-up command. Two ad-
ditional unlock cycles are written, and are then fol-
lowed by the address of the sector to be erased, and
the sector erase command. Table 11 shows the ad-
dress and data requirements for the sector erase com-
mand sequence.
The device does
not
require the system to preprogram
prior to erase. The Embedded Erase algorithm auto-
matically programs and verifies the entire memory for
an all zero data pattern prior to electrical erase. The
system is not required to provide any controls or tim-
ings during these operations.
After the command sequence is written, a sector erase
time-out of 50 μs occurs. During the time-out period,
additional sector addresses and sector erase com-
mands may be written. Loading the sector erase buffer
may be done in any sequence, and the number of sec-
tors may be from one sector to all sectors. The time
between these additional cycles must be less than 50
μs, otherwise erasure may begin. Any sector erase ad-
dress and command following the exceeded time-out
may or may not be accepted. It is recommended that
processor interrupts be disabled during this time to en-
sure all commands are accepted. The interrupts can
be re-enabled after the last Sector Erase command is
written.
Any command other than Sector Erase or
Erase Suspend during the time-out period resets
the device to the read mode.
The system must re-
write the command sequence and any additional ad-
dresses and commands.
The system can monitor DQ3 and DQ11 to determine
if the sector erase timer has timed out (See the section
on DQ3 and DQ11: Sector Erase Timer.). The time-out
begins from the rising edge of the final WE# pulse in
the command sequence.
When the Embedded Erase algorithm is complete, the
device returns to reading array data and addresses
are no longer latched. Note that while the Embedded
Erase operation is in progress, the system can read
data from the non-erasing sector. The system can de-
termine the status of the erase operation by reading
DQ7 and DQ15, DQ6 and DQ14, or DQ2 and DQ10 in
the erasing sector. Refer to the Write Operation Status
section for information on these status bits.
Once the sector erase operation has begun, only the
Erase Suspend command is valid. All other com-
mands are ignored. However, note that a
hardware
reset
immediately
terminates the erase operation. If
that occurs, the sector erase command sequence
should be reinitiated once the device has returned to
reading array data, to ensure data integrity.
Figure 7 illustrates the algorithm for the erase opera-
tion. Refer to the Erase and Program Operations ta-
bles in the AC Characteristics section for parameters,
and Figure 19 section for timing diagrams.
Erase Suspend/Erase Resume
Commands
The Erase Suspend command, B0h, allows the sys-
tem to interrupt a sector erase operation and then read
data from, or program data to, any sector not selected
for erasure. This command is valid only during the sec-
tor erase operation, including the 50 μs time-out pe-
riod during the sector erase command sequence. The
Erase Suspend command is ignored if written during
the chip erase operation or Embedded Program
algorithm.
When the Erase Suspend command is written during
the sector erase operation, the device requires a typi-
cal of 5 μs (maximum of 20 μs) to suspend the erase
operation. However, when the Erase Suspend com-
mand is written during the sector erase time-out, the
device immediately terminates the time-out period and
suspends the erase operation.
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