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S29AS016J Datasheet(PDF) 21 Page - SPANSION

Part # S29AS016J
Description  16 Megabit (2 M x 8-Bit/1 M x 16-Bit) CMOS 1.8 Volt-Only Boot Sector Flash Memory
PDF  60 Pages
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Manufacturer  SPANSION [SPANSION]
Direct Link  http://www.spansion.com
Logo SPANSION - SPANSION

S29AS016J Datasheet(HTML) 21 Page - SPANSION

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February 1, 2012 S29AS016J_00_11
S29AS016J
21
Data
She e t
7.11
Sector Group Protection/Unprotection
The hardware sector group protection feature disables both program and erase operations in any sector
group (see Table 7.3 on page 19 to Table 7.6 on page 22). 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 group protection/unprotection requires VID on the RESET# pin only, and can be implemented either
in-system or via programming equipment. Figure 7.1 on page 23 shows the algorithms and Figure 18.1
on page 46 shows the timing diagram. This method uses standard microprocessor bus cycle timing. For
sector group unprotect, all unprotected sector groups must first be protected prior to the first sector group
unprotect write cycle.
The device is shipped with all sector groups unprotected. Spansion offers the option of programming and
protecting sector groups at its factory prior to shipping the device through Spansion Programming Service.
Contact a Spansion representative for details.
It is possible to determine whether a sector group is protected or unprotected. See Autoselect Mode
on page 18 for details.
Table 7.5 AS016J Top Boot Device Sector/Sector Group Protection
Sector / Sector Block
A19
A18
A17
A16
A15
A14
A13
A12
Sector / Sector Block Size
SA0-SA3
0
0
0
X
X
X
X
X
256 (4x64) Kbytes
SA4-SA7
0
0
1
X
X
X
X
X
256 (4x64) Kbytes
SA8-SA11
0
1
0
X
X
X
X
X
256 (4x64) Kbytes
SA12-SA15
0
1
1
X
X
X
X
X
256 (4x64) Kbytes
SA16-SA19
1
0
0
X
X
X
X
X
256 (4x64) Kbytes
SA20-SA23
1
0
1
X
X
X
X
X
256 (4x64) Kbytes
SA24-SA27
1
1
0
X
X
X
X
X
256 (4x64) Kbytes
SA28-SA29
1
1
1
0
X
X
X
X
128 (2x64) Kbytes
SA30
1
1110
X
X
X
64 Kbytes
SA31
1
1111000
8 Kbytes
SA32
1
1111001
8 Kbytes
SA33
1
1111010
8 Kbytes
SA34
1
1111011
8 Kbytes
SA35
1
1111100
8 Kbytes
SA36
1
1111101
8 Kbytes
SA37
1
1111110
8 Kbytes
SA38
1
1111111
8 Kbytes



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