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参数资料
| 型号： | MBM29DL32TF70TN |
| 厂商： | FUJITSU LTD |
| 元件分类： | PROM |
| 英文描述： | 2M X 16 FLASH 3V PROM, 70 ns, PDSO48 |
| 封装： | PLASTIC, TSOP1-48 |
| 文件页数： | 26/70页 |
| 文件大小： | 862K |
| 代理商： | MBM29DL32TF70TN |
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MBM29DL32TF/BF-70
32
Chip Erase Time
= Sector Erase Time × All sectors + Chip Program Time (Preprogramming)
“2. Embedded EraseTM Algorithm” in sFLOW CHART illustrates the Embedded EraseTM Algorithm using typical
command strings and bus operations.
6.
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 CE or WE whichever
happens later, while the command (Data
= 30h) is latched on the rising edge of CE or WE which happens first.
After time-out of “tTOW” 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 “MBM29DL32TF/BF
Command Definitions Table” in sDEVICE BUS OPERATION. 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 “tTOW” 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 “tTOW” from the rising edge of last CE or WE whichever
happens first will initiate the execution of the Sector Erase command (s) . If another falling edge of CE or WE,
whichever happens first occurs within the “tTOW” time-out window the timer is reset. (Monitor DQ3 to determine
if the sector erase timer window is still open, see “16. DQ3 Sector Erase Timer”.) Resetting the devices once
execution has begun will corrupt the data in the sector. In that case, restart the erase on those sectors and allow
them to complete. (Refer to “12. Write Operation Status” for Sector Erase Timer operation.) Loading the sector
erase buffer may be done in any sequence and with any number of sectors (0 to 38) .
Sector erase does not require the user to program the devices prior to erase. The devices automatically program
all memory locations in the sector (s) to be erased prior to electrical erase (Preprogram function) . 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 system can determine the status of the erase operation by using DQ7 (Data Polling) , DQ6 (Toggle Bit) , or
RY/BY.
The sector erase begins after the “tTOW” time out from the rising edge of CE or WE whichever happens first for
the last sector erase command pulse and terminates when the data on DQ7 is “1” (See “12. Write Operation
Status”.) at which time the devices return to the read mode. Data polling and Toggle Bit must be performed at
an address within any of the sectors being erased.
Multiple Sector Erase Time
= [Sector Erase Time + Sector Program Time (Preprogramming) ] × Number of
Sector Erase
In case of multiple sector erase across bank boundaries, a read from bank (read-while-erase) can not perform.
“2. Embedded EraseTM Algorithm” in sFLOW CHART illustrates the Embedded EraseTM Algorithm using typical
command strings and bus operations.
7.
Erase Suspend/Resume
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. Writing the Erase Suspend command (B0h) during
the Sector Erase time-out results in immediate termination of the time-out period and suspension of the erase
operation.
Writing the Erase Resume command (30h) resumes the erase operation. The bank addresses of sector being
erasing or suspending should be set 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 “tSPD” to suspend the erase operation. When the devices have entered the erase-suspended mode, the
RY/BY output pin will be at High-Z and the DQ7 bit will be at logic “1”, and DQ6 will stop toggling. The user must
use the address of the erasing sector for reading DQ6 and DQ7 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 devices default to the erase-suspend-read mode. Reading
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