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參數(shù)資料
| 型號(hào)： | 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)： | 22/44頁 |
| 文件大小： | 249K |
| 代理商： | ΜPD29F008AL-X |
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Preliminary Data Sheet
22
μ
PD29F008AL-X
5. Hardware Sequence Flags
The status of automatic program / erase operations can be determined from the status of the I/O2, I/O3, I/O5, I/O6,
I/O7, and RY (/BY) pins.
Table 5-1. Hardware Sequence Flag
Status
I/O7
Note1
I/O6
Note2
I/O5
Note3
I/O3
I/O2
Note1
RY (/BY)
Progress
Program
/I/O7
Toggle
0
0
1
0
Erase
0
Toggle
0
1
Toggle
0
Erase suspend
Erase suspended
sector
1
1
0
0
Toggle
1
Non-erase
suspended sector
Data
Data
Data
Data
Data
1
Erase suspend
program
/I/O7
Toggle
0
0
1
0
Exceeding time limits
Program
/I/O7
Toggle
1
0
1
0
Erase
0
Toggle
1
1
N/A
0
Erase suspend
Erase suspend
program
/I/O7
Toggle
1
0
N/A
0
Notes 1.
To read I/O7 or I/O2, a valid address must be input.
2.
To read I/O6, any address can be used.
3.
For I/O5, "1" is output if the automatic program / erase time exceeds the prescribed number of internal
pulses.
5.1 I/O7 (Data Polling)
Data polling is a function to determine whether automatic program / erase is currently being performed by using I/O7.
Data polling is valid from the rise of the last /WE in the program / erase command sequence.
Whether automatic program is currently being executed can be determined by reading from the program destination
addresses. When automatic program is in progress, the complement of the data programmed last is output. Upon
completion of automatic program, the true value of the programmed data, not the complement, is output.
If write is performed to an address inside a protected sector, data polling is valid for approximately 1
μ
s, and then
the device is reset to the read mode.
Whether automatic erase is in progress can be determined by reading from the addresses of the sector being
erased. If erase is in progress, "0" is output to I/O7. When automatic erase is completed or suspended, "1" is output
to I/O7.
During automatic erase, if all the selected sectors are protected, data polling is valid for approximately 100
μ
s. The
device is then 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.
Upon completion of automatic program / erase, after the data output to I/O7 changes from the complement to the
true value, I/O7 changes asynchronously like I/O0 to I/O6 while /OE is maintained at low level.
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