AM29F004BT-90JI データシートの表示（PDF） - Spansion Inc.

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AM29F004BT-90JI

4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory

Spansion Inc. 

DATA SHEET

Increment

PLSCNT

No

START

PLSCNT = 1

Set OE# = VID.

Write Sector

Unlock sequence

with command 24h

Wait 1 μs

Write 60h to any

address with

A6 = 0, A5 = 1,

A1 = 1, A0 = 0

Set up sector

address

Sector Protect:

Write 60h to sector

address with

A6 = 0, A5 = 1,

A1 = 1, A0 = 0

Wait 150 ± 15 µs

Set OE# = VIH

Verify Sector

Protect: Write 40h

to sector address

with A6 = 0,

A1 = 1, A0 = 0

Set OE# = VIL

Read from

sector address

with A6 = 0,

A1 = 1, A0 = 0

(requires 1 µs

access time)

Reset

PLSCNT = 1

PLSCNT

= 25?

Yes

Device failed

No

Data = 01h?

Yes

Protect another Yes

sector?

No

Set OE# = VID.

Write Sector

Relock sequence.

Set OE# = VIH.

Sector Protect

Algorithm

Sector Protect

complete

Protect all sectors:

The indicated portion

of the sector protect

algorithm must be

performed for all

unprotected sectors

prior to issuing the

first sector

unprotect address

START

PLSCNT = 1

Set OE# = VID.

Write Sector

Unlock sequence

with command 24h

Wait 1 μs

Write 60h to

any address with

A6 = 1, A5 = 1,

A1 = 1, A0 = 0

No

All sectors

protected?

Increment

PLSCNT

No

Yes

Set up first sector

address

Sector Unprotect:

Write 60h to sector

address with

A6 = 1, A5 = 1,

A1 = 1, A0 = 0

Set OE# = VIH

Wait 15 ± 1.5 ms

Verify Sector

Unprotect: Write

40h to sector

address with

A6 = 1, A1 = 1,

A0 = 0

Set OE# = VIL

Read from

sector address

with A6 = 1,

A1 = 1, A0 = 0

(requires 1 µs

access time)

PLSCNT

= 1000?

No

Data = 00h?

Yes

Yes

Device failed

Last sector No

verified?

Yes

Sector Unprotect

Algorithm

Set OE# = VID.

Write Sector

Relock sequence.

Set OE# = VIH.

Set up

next sector

address

Sector Unprotect

complete

Figure 1. In-System Sector Protect/Sector Unprotect Algorithms

May 9, 2006 Am29F004B_00_E4

Am29F004B

11

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