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参数资料
| 型号： | MBM29LV651UE-90TN |
| 厂商： | SPANSION LLC |
| 元件分类： | PROM |
| 英文描述： | 4M X 16 FLASH 3V PROM, 90 ns, PDSO48 |
| 封装： | PLASTIC, TSOP1-48 |
| 文件页数： | 16/57页 |
| 文件大小： | 640K |
| 代理商： | MBM29LV651UE-90TN |
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MBM29LV650UE90/651UE90
22
Multiple sectors may be erased concurrently by writing the six bus cycle operations on “MBM29LV650UE/651UE
Command Definitions Table” in s DEVICE 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 section “DQ3”, Sector Erase Timer.) Any command other than
Sector Erase or Erase Suspend during this time-out period will reset the devices to the read mode, ignoring the
previous command string. 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 “Write Operation Status”
section for Sector Erase Timer operation.) Loading the sector erase buffer may be done in any sequence and
with any number of sectors (0 to 127).
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), and DQ6 (Toggle Bit).
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 “Write Operation Status”
section.) 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
The Embedded EraseTM Algorithm using typical command strings and bus operations are illustrated
“(2) Embedded EraseTM Algorithm” in s FLOW CHART.
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. The Erase Suspend command will be ignored if
written during the Chip Erase operation or Embedded Program Algorithm. Writting 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 addresses are “Don’t Care” when
writting 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 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
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 DQ2 to toggle. (See the section on “DQ2”.)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MBM29LV651UE90TR | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:64M (4M x 16) BIT |
| MBM29LV652UE | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:64M (4M X 16) BIT |
| MBM29LV652UE-12 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:64M (4M X 16) BIT |
| MBM29LV652UE-90 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:64M (4M X 16) BIT |
| MBM29LV652UE90PBT | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:64M (4M X 16) BIT |
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