Datasheet > A29800

A29800

更新时间： 2022-11-29 02:53:02

品牌	Logo	应用领域
联笙电子 - AMICC		闪存
页数	文件大小	规格书
34页	515K
描述
1024K X 8 Bit / 512K X 16 Bit CMOS 5.0 Volt-only, Boot Sector Flash Memory

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A29800 数据手册

A29800 Series

Sector Protection/Unprotection

Temporary Sector Unprotect

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.

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

Sector protection/unprotection must be implemented using

programming equipment. The procedure requires a high

voltage (VID) 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.

programmed or erased by selecting the sector addresses.

Once VID is removed from the

pin, all the previously

RESET

protected sectors are protected again. Figure 1 shows the

algorithm, and the Temporary Sector Unprotect diagram

shows the timing waveforms, for this feature.

Hardware Data Protection

START

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

VCC power-up transitions, or from system noise. The device

is powered up to read array data to avoid accidentally writing

data to the array.

RESET = VID

(Note 1)

Perform Erase or

Program Operations

Write Pulse "Glitch" Protection

Noise pulses of less than 5ns (typical) on

do not initiate a write cycle.

OE CE

Logical Inhibit

Write cycles are inhibited by holding any one of

RESET = VIH

=VIL,

= VIH or

= VIH. To initiate a write cycle,

and

must be a logical zero while

is a logical one.

Temporary Sector

Unprotect

Completed (Note 2)

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

reading array data on the initial power-up.

Notes:

1. All protected sectors unprotected.

2. All previously protected sectors are protected once again.

Figure 1. Temporary Sector Unprotect Operation

PRELIMINARY

(May, 2001, Version 0.0)

AMIC Technology, Inc.

1...6 7 8910 11 12...34

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