參數(shù)資料
型號(hào)： 29LV650
廠商： Fujitsu Limited
英文描述： 64M (4M x 16) BIT
中文描述： 64M號(hào)（4米× 16）位
文件頁數(shù)： 25/57頁
文件大?。?/td> 625K
代理商： 29LV650
MBM29LV650UE/651UE-
90/12
25
DQ
7
Data Polling
The MBM29LV650UE/651UE 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 DQ
7
. Upon completion of the Embedded Program
Algorithm, an attempt to read the device will produce the true data last written to DQ
7
. During the Embedded
Erase Algorithm, an attempt to read the device will produce a “0” at the DQ
7
output. Upon completion of the
Embedded Erase Algorithm an attempt to read the device will produce a “1” at the DQ
7
output. The flowchart
for Data Polling (DQ
7
) is shown in Figure 18.
For programming, the Data Polling is valid after the rising edge of fourth write pulse in the four write pulse
sequence.
For chip erase and sector erase, the Data Polling is valid after the rising edge of the sixth write pulse in the six
write pulse sequence. Data Polling must be performed at sector address within any of the sectors being erased
and not a protected sector. Otherwise, the status may not be valid.
Once the Embedded Algorithm operation is close to being completed, the MBM29LV650UE/651UE data pins
(DQ
7
) may change asynchronously while the output enable (OE) is asserted low. This means that the devices
are driving status information on DQ
7
at one instant of time and then that byte’s valid data at the next instant of
time. Depending on when the system samples the DQ
7
output, it may read the status or valid data. Even if the
device has completed the Embedded Algorithm operation and DQ
7
has a valid data, the data outputs on DQ
0
to DQ
6
may be still invalid. The valid data on DQ
0
to DQ
7
will be read on the successive read attempts.
The Data Polling feature is only active during the Embedded Programming Algorithm, Embedded Erase Algorithm
or sector erase time-out. (See Table 8.)
See Figure 9 for the Data Polling timing specifications and diagram.
DQ
6
Toggle Bit I
The MBM29LV650UE/651UE also feature the “Toggle Bit I” as a method to indicate to the host system that the
Embedded Algorithms are in progress or completed.
During an Embedded Program or Erase Algorithm cycle, successive attempts to read (OE toggling) data from
the devices will result in DQ
6
toggling between one and zero. Once the Embedded Program or Erase Algorithm
cycle is completed, DQ
6
will stop toggling and valid data will be read on the next successive attempts. During
programming, the Toggle Bit I is valid after the rising edge of the fourth write pulse in the four write pulse sequence.
For chip erase and sector erase, the Toggle Bit I is valid after the rising edge of the sixth write pulse in the six
write pulse sequence. The Toggle Bit I is active during the sector time out.
In programming, if the sector being written to is protected, the toggle bit will toggle for about 1
μ
s and then stop
toggling without the data having changed. In erase, the devices will erase all the selected sectors except for the
ones that are protected. If all selected sectors are protected, the chip will toggle the toggle bit for about 400
μ
s
and then drop back into read mode, having changed none of the data.
Either CE or OE toggling will cause the DQ
6
to toggle. In addition, an Erase Suspend/Resume command will
cause the DQ
6
to toggle.
See Figure 10 for the Toggle Bit I timing specifications and diagram.
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