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参数资料
| 型号： | A29L400ATM-90F |
| 厂商： | AMIC Technology Corporation |
| 英文描述： | 512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
| 中文描述： | 为512k × 8位/ 256 × 16位的CMOS 3.0伏只，引导扇区闪存 |
| 文件页数： | 10/38页 |
| 文件大小： | 539K |
| 代理商： | A29L400ATM-90F |
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A29L400A Series
PRELIMINARY
(July, 2005, Version 0.0)
9
AMIC Technology, Corp.
Sector Protection/Unprotection
The hardware sector protection feature disables both
program and erase operations in any sector. The hardware
sector unprotection feature re-enables both program and
erase operations in previously protected sectors.
It is possible to determine whether a sector is protected or
unprotected. See “Autoselect Mode” for details.
Sector protection / unprotection can be implemented via two
methods. The primary method requires VID on the
RESET
pin only, and can be implemented either in-system or
via programming equipment. Figure 2 shows the algorithm
and the Sector Protect / Unprotect Timing Diagram illustrates
the timing waveforms for this feature. This method uses
standard microprocessor bus cycle timing. For sector
unprotect, all unprotected sectors must first be protected
prior to the first sector unprotect write cycle. The alternate
method
must
be
implemented
equipment. The procedure requires a high voltage (V
ID
) on
address pin A9 and the control pins.
The device is shipped with all sectors unprotected.
It is possible to determine whether a sector is protected or
unprotected. See "Autoselect Mode" for details.
using
programming
Hardware Data Protection
The requirement of command unlocking sequence for
programming or erasing provides data protection against
inadvertent writes (refer to the Command Definitions table).
In addition, the following hardware data protection measures
prevent accidental erasure or programming, which might
otherwise be caused by spurious system level signals during
V
CC
power-up transitions, or from system noise. The device
is powered up to read array data to avoid accidentally writing
data to the array.
Write Pulse "Glitch" Protection
Noise pulses of less than 5ns (typical) on
OE
,
CE
or
WE
do not initiate a write cycle.
Logical Inhibit
Write cycles are inhibited by holding any one of
OE
=V
IL
,
CE
= V
IH
or
WE
= V
IH
. To initiate a write cycle,
CE
and
WE
must be a logical zero while
OE
is a logical one.
Power-Up Write Inhibit
If
WE
=
CE
= V
IL
and
OE
= V
IH
during power up, the
device does not accept commands on the rising edge of
WE
. The internal state machine is automatically reset to
reading array data on the initial power-up.
Temporary Sector Unprotect
This feature allows temporary unprotection of previous
protected sectors to change data in-system. The Sector
Unprotect mode is activated by setting the
RESET
pin to V
ID
.
During this mode, formerly protected sectors can be
programmed or erased by selecting the sector addresses.
Once V
ID
is removed from the
RESET
pin, all the previously
protected sectors are protected again. Figure 1 shows the
algorithm, and the Temporary Sector Unprotect diagram
shows the timing waveforms, for this feature.
START
RESET = V
ID
(Note 1)
Perform Erase or
Program Operations
RESET = V
IH
Temporary Sector
Unprotect
Completed (Note 2)
Notes:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once again.
Figure 1. Temporary Sector Unprotect Operation
相关PDF资料 |
PDF描述 |
|---|---|
| A29L400ATM-90I | 512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
| A29L400ATM-90IF | 512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
| A29L400ATM-90U | 512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
| A29L400ATV-70 | 512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
| A29L400ATV-70F | 512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A29L400ATM-90I | 制造商:AMICC 制造商全称:AMIC Technology 功能描述:512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
| A29L400ATM-90IF | 制造商:AMICC 制造商全称:AMIC Technology 功能描述:512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
| A29L400ATM-90U | 制造商:AMICC 制造商全称:AMIC Technology 功能描述:512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
| A29L400ATM-90UF | 制造商:AMICC 制造商全称:AMIC Technology 功能描述:512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
| A29L400ATV-70 | 制造商:AMICC 制造商全称:AMIC Technology 功能描述:512K X 8 Bit / 256K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory |
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