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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
Once it is protected, protection can not be cancelled, so please pay closest attention.
Write Operation Status
Detailed in Table 8 are all the status flags that can be used to check the status of the device for current mode
operation. During sector erase, the part provides the status flags automatically to the I/O ports. The information
on DQ2 is address sensitive. This means that if an address from an erasing sector is consecutively read, then
the DQ2 bit will toggle. However, DQ2 will not toggle if an address from a non-erasing sector is consecutively
read. This allows the user to determine which sectors are erasing and which are not.
Once erase suspend is entered, address sensitivity still applies. If the address of a non-erasing sector (that is,
one available for read) is provided, then stored data can be read from the device. If the address of an erasing
sector (that is, one unavailable for read) is applied, the device will output its status bits.
Table 8 Hardware Sequence Flags
Status
Embedded Program Algorithm
DQ7
DQ7
DQ6
Toggle
DQ5
0
DQ3
0
DQ2
1
Embedded Erase Algorithm
0
Toggle
0
1 Toggle*
In Progress
Erase
Suspended
Mode
Erase Suspend Read
(Erase Suspended Sector)
Erase Suspend Read
(Non-Erase Suspended Sector)
Erase Suspend Program
(Non-Erase Suspended Sector)
1
1
0
Data Data Data
DQ7 Toggle
0
0
Toggle
Data Data
0
1*
Embedded Program Algorithm
DQ7 Toggle
1
Exceeded Embedded Erase Algorithm
0
Toggle
1
Time Limits
Erase
Suspended
Mode
Erase Suspend Program
(Non-Erase Suspended Sector)
DQ7 Toggle
1
0
1
1
N/A
0
N/A
*: 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.
Notes: 1. DQ0 and DQ1 are reserve pins for future use.
2. DQ4 is Fujitsu internal use only.
DQ7
Data Polling
The MBM29LV652UE devices feature Data Polling as a method to indicate to the host that the Embedded
Algorithms are in progress or completed. During the Embedded Program Algorithm an attempt to read the
devices will produce the complement of the data last written to DQ7. Upon completion of the Embedded Program
Algorithm, an attempt to read the device will produce the true data last written to DQ7. During the Embedded
Erase Algorithm, an attempt to read the device will produce a “0” at the DQ7 output. Upon completion of the
Embedded Erase Algorithm an attempt to read the device will produce a “1” at the DQ7 output. The flowchart
for Data Polling (DQ7) is shown in Figure 20.
For programming, the Data Polling is valid after the rising edge of fourth write pulse in the four write pulse
sequence.
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