M750000007 datasheet(47/129 Pages) SPANSION

47 / 129 page

February 6, 2004

Am75PDL191BHHa/Am75PDL193BHHa

ADV ANCE

I N FO RMAT I O N

Figure 3.

PDL127/9H SecSi Sector Protection Algorithm

The SecSi Sector lock must be used with caution

since, once locked, there is no procedure available for

unlocking the SecSi Sector area and none of the bits

in the SecSi Sector memory space can be modified in

any way.

SecSi Sector Protection Bits

The SecSi Sector Protection Bits prevent program-

ming of the SecSi Sector memory area. Once set, the

SecSi Sector memory area contents are non-modifi-

able.

START

SecSiTM Sector Entry

Write AAh to address 555h

Write 55h to address 2AAh

Write 88h to address 555h

SecSi Sector

Protection Entry

Write AAh to address 555h

Write 55h to address 2AAh

Write 60h to address 555h

PLSCNT = 1

Protect SecSi Sector:

write 68h to sector address

with A7–A0 = 00011010

Time out 256

µs

Read from sector address

with A7–A0 = 00011010

Data = 01h?

Yes

SecSi Sector

Protection Completed

SecSi Sector Exit

Write 555h/AAh

Write 2AAh/55h

Write SA0+555h/90h

Write XXXh/00h

Verify SecSi Sector:

write 48h to sector address

with A7–A0 = 00011010

Increment PLSCNT

PLSCNT = 25?

Device Failed

SecSi Sector Entry

SecSi Sector Protection

SecSi Sector Exit

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