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參數(shù)資料
| 型號： | μPD29F008AL-X |
| 廠商： | NEC Corp. |
| 英文描述： | 8 M-Bit CMOS Low Voltage Flash Memory(8M CMOS低壓閃存) |
| 中文描述： | 8 m位的CMOS低電壓快閃記憶體（800萬的CMOS低壓閃存） |
| 文件頁數(shù)： | 24/44頁 |
| 文件大小： | 249K |
| 代理商： | ΜPD29F008AL-X |
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Preliminary Data Sheet
24
μ
PD29F008AL-X
5.2 I/O6 (Toggle Bit)
The toggle bit is a function that uses I/O6 to determine whether automatic program / erase is in progress.
The toggle bit becomes valid from the rise of the last /WE in the program / erase command sequence.
During automatic program / erase, I/O6 is toggled when continuous read is performed from any address. Upon
automatic program / erase completion or suspend, I/O6 stops being toggled and outputs valid data for read.
Continuous read control is performed with the /OE or /CE pins.
If program is performed for addresses inside a protected sector, I/O6 is toggled approximately 2
μ
s, and then the
device is reset to the read mode.
Moreover, if all the sectors selected at the time of automatic erase are protected, I/O6 is toggled approximately 100
μ
s, and then the device is reset to the read mode. If the selected sectors include both protected and unprotected
sectors, only unprotected sectors are erased, and protected sectors are ignored.
In this way, by using I/O6, it is possible to determine whether automatic erase is in progress (or suspended), but to
determine which sector is being erased, I/O2 (toggle bit II) is used. See section
5.3 I/O2 (Toggle Bit II)
.
Figure 5-3. Toggle Bit Timing Chart
Note
I/O6 stops the toggle (indicates automatic program / erase completion).
Figure 5-4. Toggle Bit Flow Chart
Start
Read (I/O0 - I/O7)
An = Don't Care
I/O6 = toggle
No
No
Fail
Yes
No
I/O5 = 1
Read (I/O0 - I/O7)
An = Don't Care
I/O6 =toggle
Pass
Yes
Yes
/CE (Input)
t
OEH
/WE (Input)
/OE(Input)
I/O6 (Input / Output)
t
OES
Toggle
Input data
Toggle
Valid
data out
Stop
toggling
Note
Toggle
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