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AM29LV320MH101REF Datasheet(PDF) 18 Page - SPANSION

Part # AM29LV320MH101REF
Description  32 Megabit (2 M x 16-Bit/4 M x 8-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control
PDF  59 Pages
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Direct Link  http://www.spansion.com
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AM29LV320MH101REF Datasheet(HTML) 18 Page - SPANSION

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Am29LV320MH/L
December 14, 2005
DA TA SH EET
Sector Group Protection and
Unprotection
The hardware sector group protection feature disables
both program and erase operations in any sector
group. In this device, a sector group consists of four
adjacent sectors that are protected or unprotected at
the same time (see Table 4). The hardware sector
group unprotection feature re-enables both program
and erase operations in previously protected sector
groups. Sector group protection/unprotection can be
implemented via two methods.
Sector protection/unprotection requires VID on the RE-
SET# pin only, and can be implemented either in-sys-
tem or via programming equipment. Figure 2 shows
the algorithms and Figure 24 shows the timing dia-
gram. This method uses standard microprocessor bus
cycle timing. For sector group unprotect, all unpro-
tected sector groups must first be protected prior to
the first sector group unprotect write cycle.
The device is shipped with all sector groups unpro-
tected. AMD offers the option of programming and pro-
tecting sector groups at its factory prior to shipping the
device through AMD’s ExpressFlash™ Service. Con-
tact an AMD representative for details.
It is possible to determine whether a sector group is
protected or unprotected. See the Autoselect Mode
section for details.
Table 4.
Sector Group Protection/Unprotection
Address Table
Sector Group
A20–A15
SA0
000000
SA1
000001
SA2
000010
SA3
000011
SA4–SA7
0001xx
SA8–SA11
0010xx
SA12–SA15
0011xx
SA16–SA19
0100xx
SA20–SA23
0101xx
SA24–SA27
0110xx
SA28–SA31
0111xx
SA32–SA35
1000xx
SA36–SA39
1001xx
SA40–SA43
1010xx
SA44–SA47
1011xx
SA48–SA51
1100xx
SA52–SA55
1101xx
SA56–SA59
1110xx
SA60
111100
SA61
111101
SA62
111110
SA63
111111



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