Octorber 18, 2004 S29GLxxxM_00_B3
S29GLxxxM MirrorBitTM Flash Family
81
Da tash 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 on page 28). 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 RESET# pin only, and can be implemented either in-system or
timing diagram. This method uses standard microprocessor bus cycle timing. For sector group unprotect, all un-
protected 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 protect-
ing 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 the
“Autoselect Mode” onNote: All sector groups are 256 Kbytes in size.
Table 19. S29GL032M (Model R0) Sector Group Protection/Unprotection Address Table
Sector Group
A22–A18
SA0–SA3
00000
SA4–SA7
00001
SA8–SA11
00010
SA12–SA15
00011
SA16–SA19
00100
SA20–SA23
00101
SA24–SA27
00110
SA28–SA31
00111
SA32–SA35
01000
SA36–SA39
01001
SA40–SA43
01010
SA44–SA47
01011
SA48–SA51
01100
SA52–SA55
01101
SA56–SA59
01110
SA60–SA63
01111
Table 20. S29GL032M (Models R1, R2) Sector Group Protection/Unprotection Address Table (Sheet 1 of 2)
Sector Group
A20–A15
SA0
000000
SA1
000001
SA2
000010
SA3
000011
SA4–SA7
0001xx
SA8–SA11
0010xx
SA12–SA15
0011xx