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| 型號： | MBM29LV080-10 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 8M (1M ×8) Bit Flash Memory(8M (1M ×8)位 單5V 電源電壓閃速存儲器) |
| 中文描述： | 8米（1米× 8）位閃存（8米（1米× 8）位單5V的電源電壓閃速存儲器） |
| 文件頁數(shù)： | 14/44頁 |
| 文件大小： | 420K |
| 代理商： | MBM29LV080-10 |
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14
MBM29LV080
-10/-12/-15
Sector Erase
Sector erase is a six bus cycle operation. There are two “unlock” write cycles. These are followed by writing the
“set-up” command. Two more “unlock” write cycles are then followed by the sector erase command. The sector
address (any address location within the desired sector) is latched on the falling edge of WE, while the command
Data = (30H) is latched on the rising edge of WE. After time-out of 50
μ
s from the rising edge of the last sector
erase command, the sector erase operation will begin.
Multiple sectors may be erased concurrently by writing the six bus cycle operations on Table 6. This sequence is
followed with writes of the Sector Erase command to addresses in other sectors desired to be concurrently erased.
The time between writes must be less than 50
μ
s otherwise that command will not be accepted and erasure will
start. It is recommended that processor interrupts be disabled during this time to guarantee this condition. The
interrupts can be re-enabled after the last Sector Erase command is written. A time-out of 50
μ
s from the rising
edge of the last WE will initiate the execution of the Sector Erase command(s). If another falling edge of the WE
occurs within the 50
μ
s time-out window the timer is reset. (Monitor DQ
3
to determine if the sector erase timer
window is still open, see section DQ
3
, Sector Erase Timer.) Any command other than Sector Erase or Erase Suspend
during this time-out period will reset the device to the read mode, ignoring the previous command string. Resetting
the device once execution has begun will corrupt the data in that sector. In that case, restart the erase on those
sectors and allow them to complete. (Refer to the Write Operation Status section for DQ3, Sector Erase Timer
operation.) Loading the sector erase buffer may be done in any sequence and with any number of sectors (0 to 15).
Sector erase does not require the user to program the device prior to erase. The device automatically programs all
memory locations in the sector(s) to be erased prior to electrical erase. When erasing a sector or sectors the
remaining unselected sectors are not affected. The system is not required to provide any controls or timings during
these operations.
The automatic sector erase begins after the 50
μ
s time out from the rising edge of the WE pulse for the last sector
erase command pulse and terminates when the data on DQ
7
is “1” (See Write Operation Status section.) at which
time the device returns to the read mode. Data polling must be performed at an address within any of the sectors
being erased.
Figure 18 illustrates the Embedded Erase Algorithm using typical command strings and bus operations.
Erase Suspend
The Erase Suspend command allows the user to interrupt a Sector Erase operation and then perform data reads
from or programs to a sector not being erased. This command is applicable ONLY during the Sector Erase operation
which includes the time-out period for sector erase. The Erase Suspend command will be ignored if written during
the Chip Erase operation or Embedded Program Algorithm. Writting the Erase Suspend command during the Sector
Erase time-out results in immediate termination of the time-out period and suspension of the erase operation.
Any other command written during the Erase Suspend mode will be ignored except the Erase Resume command.
Writing the Erase Resume command resumes the erase operation. The addresses are “DON’T CARES” when
writing the Erase Suspend or Erase Resume command.
When the Erase Suspend command is written during the Sector Erase operation, the device will take a maximum
of 20
μ
s to suspend the erase operation. When the device has entered the erase-suspended mode, the RY/BY
output pin and the DQ
7
bit will be at logic “1”, and DQ
6
will stop toggling. The user must use the address of the
erasing sector for reading DQ
6
and DQ
7
to determine if the erase operation has been suspended. Further writes
of the Erase Suspend command are ignored.
When the erase operation has been suspended, the device defaults to the erase-suspend-read mode. Reading
data in this mode is the same as reading from the standard read mode except that the data must be read from
sectors that have not been erase-suspended. Successively reading from the erase-suspended sector while the
device is in the erase-suspend-read mode will cause DQ
2
to toggle. (See the section on DQ
2
.)
After entering the erase-suspend-read mode, the user can program the device by writing the appropriate command
sequence for Byte Program. This program mode is known as the erase-suspend-program mode. Again, program-
ming in this mode is the same as programming in the regular Byte Program mode except that the data must be
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| MBM29LV080A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8M (1M x 8) BIT |
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