ACT-F128K32 Ver la hoja de datos (PDF) - Aeroflex Corporation

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ACT-F128K32

High Speed 4 Megabit FLASH Multichip Module

Aeroflex Corporation 

Figure 12

Sector Unprotect Algorithm

Start

Set VCC = 5.0 V

Protect All Sectors

PLSCNT = 1

Set Up Sector Address

Unprotected Mode

(A12 = A7 = VIH, A6 = VIL)

Set VCC = 5.0 V

Set

OE = CE = A9 = VID

Activate WE Pulse

Time Out 10ms

Set OE = CE = VIL

Remove VID from A9

Set VCC = 4.25 V

Write Autoselect

Command Sequence

Setup Sector Address SA0

Set A1 = 1, A0 = 0

Read Data

From Device

Increment

Sector Address

Notes:

SA0 = Sector Address for initial sector

SA7 = Sector Address for last sector

Please refer to Table 2

Data = 00H

No

?

Yes

No

Sector

Address = SA7

?

Yes

Set VCC = 5.0 V

Write Reset Command

Sector Unprotect

Completed

Write Reset

Command

Increment

PLSCNT

No

PLSCNT = 1000

?

Yes

Device Failure

Aeroflex Circuit Technology

16

SCD1667 REV A 4/28/97 Plainview NY (516) 694-6700

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