S29CD016G SPANSION, S29CD016G Datasheet - Page 27

• Manufacturer Part Number: S29CD016G
• Description: 16 Megabit (512 K x 32-Bit) CMOS 2.5 Volt-only Burst Mode / Dual Boot / Simultaneous Read/Write Flash Memory
• Manufacturer: SPANSION

Sector Protection
November 5, 2004 S29CD016_00_A4
CR15
CR7
RM
BS
1
1
Initial Access Delay Configuration
The frequency configuration informs the device of the number of clocks that must
elapse after ADV# is driven active before data is available. This value is deter-
mined by the input clock frequency.
The device features several levels of sector protection, which can disable both the
program and erase operations in certain sectors or sector groups.
Sector and Sector Groups
The distinction between sectors and sector groups is fundamental to sector pro-
tection. Sector are individual sectors that can be individually sector protected/
unprotected. These are the outermost 4 Kword boot sectors, that is, SA0 to SA7
and SA38 to SA45. See
Sector groups are a collection of three or four adjacent 32 kword sectors. For ex-
ample, sector group SG8 is comprised of sector SA8 to SA10. When any sector in
a sector group is protected/unprotected, every sector in that group is protection/
unprotected. See
Persistent Sector Protection
A command sector protection method that replaces the old 12 V controlled pro-
tection method.
Password Sector Protection
A highly sophisticated protection method that requires a password before
changes to certain sectors or sector groups are permitted.
WP# Hardware Protection
A write protect pin that can prevent program or erase to the two outermost 8
Kbytes sectors in the 75% bank.
All parts default to operate in the Persistent Sector Protection mode. The cus-
tomer must then choose if the Persistent or Password Protection method is most
desirable. There are two one-time programmable non-volatile bits that define
which sector protection method is used. If the customer decides to continue using
the Persistent Sector Protection method, they must set the Persistent Sector
Protection Mode Locking Bit. This permanently sets the part to operate only
using Persistent Sector Protection. If the customer decides to use the password
method, they must set the Password Mode Locking Bit. This permanently sets
the part to operate only using password sector protection.
CR14
ASD
CR6
CC
0
1
A d v a n c e
Table 10. Configuration Register After Device Reset
Reserve
IAD3
CR13
CR5
Table 12 on page 34
0
0
Table 12 on page 34
I n f o r m a t i o n
Reserve
IAD2
CR12
CR4
1
0
S29CD016G
and
Table 13 on page
Reserve
and
IAD1
CR11
CR3
1
0
Table 13 on page
IAD0
CR10
CR2
BL2
36.
1
1
36.
DOC
CR1
BL1
CR9
0
0
CR8
CR0
BL0
WC
0
0
27