HY29F400TR45 datasheet(9/40 Pages) HYNIX

Part #	HY29F400TR45

Description	4 Megabit (512Kx8/256Kx16) 5 Volt-only Flash Memory

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Manufacturer	HYNIX [Hynix Semiconductor]

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9 / 40 page

9

Rev. 5.2/May 01

HY29F400

The procedure for sector unprotection is illustrated

in the flow chart in Figure 2, and timing specifica-

tions and waveforms are given at the end of this

document. Note that to unprotect any sector, all

unprotected sectors must first be protected prior

to the first unprotect write cycle.

Sectors can also be temporarily unprotected as

described in the next section.

Temporary Sector Unprotect Operation

This feature allows temporary unprotection of pre-

viously protected sectors to allow changing the

data in-system. Temporary Sector Unprotect

mode is activated by setting the RESET# pin to

V

ID.

While in this mode, formerly protected sec-

tors can be programmed or erased by invoking

the appropriate commands (see Device Com-

mands section). Once V

ID is removed from RE-

SET#, all the previously protected sectors are pro-

tected again. Figure 3 illustrates the algorithm.

START

NOTE: All sectors must be

previously protected.

Set: TRYCNT = 1

Set: A[9] = CE# = OE# = V

ID

Set: RESET# = V

IH

WE# = V

IL

Wait t

WPP2

Set:

A[9] = V

ID

OE# = CE# = V

IL

Read Data

Data = 0x00?

NSEC = 10?

YES

TRYCNT = 1000?

NO

Increment TRYCNT

NO

YES

DEVICE FAILURE

NO

YES

Remove V

ID from A[9]

SECTOR UNPROTECT

COMPLETE

APPLY V

CC

Set Sector Address:

A[17:12] = Sector NSEC

A[0] = A[6] = V

IL

A[1] = V

IH

NSEC = NSEC + 1

Set: NSEC = 0

WE# = V

IH

Figure 2. Sector Unprotect Procedure

START

RESET# = V

ID

(All protected sector groups

become unprotected)

Perform Program or Erase

Operations

RESET# = V

IH

(All previously protected

sector groups return to

protected state)

TEMPORARY SECTOR

UNPROTECT COMPLETE

Figure 3. Temporary Sector Unprotect

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