S29AS008J datasheet(16/56 Pages) CYPRESS

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Document Number: 002-00870 Rev.*K

Page 16 of 56

S29AS008J

Figure 7.1 In-System Sector Group Protect/Unprotect Algorithms

Note

1. If WP# = VIL, the top or bottom two address sectors remains protected for boot sector devices

Sector Group Protect:

Write 60h to sector

address with

A6 = 0,

A3 = A2 = 0,

A1 = 1, A0 = 0

Set up sector

address

Wait 100 µs

Verify Sector Group

Protect: Write 40h

to sector address

with A6 = 0,

A3 = A2 = 0,

A1 = 1, A0 = 0

Read from

sector address

with A6 = 0,

A3 = A2 = 0,

A1 = 1, A0 = 0

START

PLSCNT = 1

RESET# = VID

Wait 1

μs

First Write

Cycle = 60h?

Data = 01h?

Remove VID

from RESET#

Write reset

command

Sector Group

Protect complete

Yes

PLSCNT

= 25?

Yes

Device failed

Increment

PLSCNT

Temporary Sector

Group Unprotect Mode

Sector Group Unprotect:

Write 60h to sector

address with

A6 = 1, A1 = 1,

A0 = 0

Set up first sector

group address

Wait 10 ms

Verify Sector Group

Unprotect: Write

40h to sector

address with

A6 = 1, A1 = 1,

A0 = 0

Read from

sector address

with A6 = 1,

A3 = A2 = 0,

A1 = 1, A0 = 0

START

PLSCNT = 1

RESET# = VID

Wait 1

μs

Data = 00h?

Last sector

group verified?

Remove VID

from RESET#

Write reset

command

Sector Group

Unprotect complete

Yes

PLSCNT

= 1000?

Yes

Device failed

Increment

PLSCNT

Temporary Sector Group

Unprotect Mode

All sectors

protected?

Yes

Set up

next sector

address

Yes

Sector Group

Protect Algorithm

Sector Group

Unprotect Algorithm

First Write

Cycle = 60h?

Protect another

sector?

Reset

PLSCNT = 1

Protect all sectors:

The indicated portion

of the sector group

protect algorithm

must be performed

for all unprotected

sector group prior

to issuing the first

sector group

unprotect address

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