Datasheet > A29001UV-90F

A29001UV-90F

更新时间： 2024-02-07 00:19:47

品牌	Logo	应用领域
联笙电子 - AMICC		闪存
页数	文件大小	规格书
36页	454K
描述
128K X 8 Bit CMOS 5.0 Volt-only, Boot Sector Flash Memory

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数据手册

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A29001UV-90F 数据手册

A29001/A290011 Series

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.

START

Sector protection/unprotection must be implemented using

programming 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.

RESET = VID

(Note 1)

Hardware Data Protection

Perform Erase or

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^CCpower-up transitions, or from system

noise. The device is powered up to read array data to

avoid accidentally writing data to the array.

Program Operations

RESET = VIH

Write Pulse "Glitch" Protection

Noise pulses of less than 5ns (typical) on

OE CE

Temporary Sector

Unprotect

do not initiate a write cycle.

Completed (Note 2)

Logical Inhibit

Write cycles are inhibited by holding any one of

=VIL,

= VIH or

= VIH. To initiate a write cycle,

and

Notes:

must be a logical zero while

is a logical one.

1. All protected sectors unprotected.

2. All previously protected sectors are protected once again.

Power-Up Write Inhibit

= VIL and

= VIH during power up, the

device does not accept commands on the rising edge of

. The internal state machine is automatically reset to

Figure 1. Temporary Sector Unprotect Operation

reading array data on the initial power-up.

Temporary Sector Unprotect (N/A A290011)

This feature allows temporary unprotection of previous

protected sectors to change data in-system. The Sector

Unprotect mode is activated by setting the

pin to

RESET

VID. During this mode, formerly protected sectors can be

programmed or erased by selecting the sector addresses.

Once V^IDis removed from the

pin, all the

RESET

previously protected sectors are protected again. Figure 1

shows the algorithm, and the Temporary Sector Unprotect

diagram shows the timing waveforms, for this feature.

(December, 2004, Version 1.3)

AMIC Technology, Corp.

1...5 6 789 10 11...36

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