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(wàn)的CMOS低壓閃存）
文件頁(yè)數(shù)： 17/44頁(yè)
文件大?。?/td> 249K
代理商： ΜPD29F008AL-X
Preliminary Data Sheet
17
μ
PD29F008AL-X
Figure 4-3. Sector / Chip Erase Timing Chart
Note
SA is the sector address of the sector to be erased. For chip erase, input 555H.
4.7 Erase Suspend / Resume
This command suspends automatic erase. During erase suspend, sectors for which erase is not performed can be
written to.
Suspend can be performed for sector erase (including the timeout period), but it cannot be performed for chip erase
and automatic program. Suspend can be performed for all sectors for which erase is being performed.
Following command sequence write, 20
μ
s are required until automatic erase is suspended.
While automatic erase is suspended, any sector for which erase is not being performed can be read and
programmed.
Whether automatic erase is suspended can be determined with the hardware sequence flags (I/O7, I/O6, I/O2 pins).
See sections
5.1 I/O7 (Data Polling)
,
5.2 I/O6 (Toggle Bit)
, and
5.3 I/O2 (Toggle Bit II)
.
To resume erase after it has been suspended, write the command (30H) again during erase suspend.
4.8 Unlock Bypass
This device provides an unlock bypass mode to shorten the write time.
Normally, 2 unlock cycles are required during program. In contrast, with the unlock bypass mode, it is possible to
perform program without unlock cycles.
In the unlock bypass mode, all commands except unlock bypass program and unlock bypass reset are ignored.
4.8.1 Unlock Bypass Set
This command sets the device to the unlock bypass mode.
4.8.2 Unlock Bypass Program
This command is used to perform program in the unlock bypass mode.
4.8.3 Unlock Bypass Reset
This command is used to quit the unlock bypass mode.
When this command is executed, the device returns to the read mode.
Address (Input)
/CE (Input)
/OE (Input)
/WE (Input)
I/O (Input)
V
CC
t
DS
t
DH
t
CH
t
CS
t
WPH
555H
t
WC
t
AS
t
AH
t
WP
55H
AAH
80H
AAH
55H
(10H for chip erase)
30H
2AAH
555H
555H
2AAH
SA
Note
t
GHWL
t
VCS
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