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MBM29LV652UE-12 查看數據表(PDF) - Fujitsu

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MBM29LV652UE-12 FLASH MEMORY CMOS 64M (4M × 16) BIT Fujitsu
Fujitsu Fujitsu
MBM29LV652UE-12 Datasheet PDF : 58 Pages
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MBM29LV652UE-90/12
DQ3
Sector Erase Timer
After the completion of the initial sector erase command sequence the sector erase time-out will begin. DQ3 will
remain low until the time-out is complete. Data Polling and Toggle Bit are valid after the initial sector erase
command sequence.
If Data Polling or the Toggle Bit I indicates the device has been written with a valid erase command, DQ3 may
be used to determine if the sector erase timer window is still open. If DQ3 is high (“1”) the internally controlled
erase cycle has begun; attempts to write subsequent commands to the device will be ignored until the erase
operation is completed as indicated by Data Polling or Toggle Bit I. If DQ3 is low (“0”), the device will accept
additional sector erase commands. To insure 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 were high on
the second status check, the command may not have been accepted.
See Table 8 : Hardware Sequence Flags.
DQ2
Toggle Bit II
This toggle bit II, along with DQ6, can be used to determine whether the devices are in the Embedded Erase
Algorithm or in Erase Suspend.
Successive reads from the erasing sector will cause DQ2 to toggle during the Embedded Erase Algorithm. If the
devices are in the erase-suspended-read mode, successive reads from the erase-suspended sector will cause
DQ2 to toggle. When the devices are in the erase-suspended-program mode, successive reads from the byte
address of the non-erase suspended sector will indicate a logic “1” at the DQ2 bit.
DQ6 is different from DQ2 in that DQ6 toggles only when the standard program or Erase, or Erase Suspend
Program operation is in progress. The behavior of these two status bits, along with that of DQ7, is summarized
as follows:
For example, DQ2 and DQ6 can be used together to determine if the erase-suspend-read mode is in progress.
(DQ2 toggles while DQ6 does not.) See also Table 9 and Figure 11.
Furthermore, DQ2 can also be used to determine which sector is being erased. When the device is in the erase
mode, DQ2 toggles if this bit is read from an erasing sector.
Table 9 Toggle Bit Status
Mode
DQ7
DQ6
DQ2
Program
DQ7
Toggle
1
Erase
0
Toggle
Toggle *
Erase-Suspend Read
(Erase-Suspended Sector)
1
1
Toggle
Erase-Suspend Program
DQ7
Toggle
1*
*: Successive reads from the erasing or erase-suspend sector will cause DQ2 to toggle. Reading from non-erase
suspend sector address will indicate logic “1” at the DQ2 bit.
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