CD016G0PFA Advanced Micro Devices, Inc., CD016G0PFA Datasheet - Page 27

• Manufacturer Part Number: CD016G0PFA
• Description: 16 Megabit(512 K X 32-Bit),CMOS 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/write Flash Memory
• Manufacturer: Advanced Micro Devices, Inc.

Sector Protection
March 22, 2004 S29CD016_00A0
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 will be available. This value is de-
termined 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 Tables 12 and 13.
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 Tables 12 and 13.
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 will be used. If the customer decides to continue
using the Persistent Sector Protection method, they must set the Persistent
Sector Protection Mode Locking Bit. This will permanently set the part to op-
erate only using Persistent Sector Protection. If the customer decides to use the
password method, they must set the Password Mode Locking Bit. This will
permanently set the part to operate only using password sector protection.
Reserve
CR14
CR6
CC
0
1
A d v a n c e
Table 10. Configuration Register After Device Reset
Reserve
IAD3
CR13
CR5
0
0
I n f o r m a t i o n
Reserve
IAD2
CR12
CR4
1
0
S29CD016G
Reserve
IAD1
CR11
CR3
1
0
IAD0
CR10
CR2
BL2
1
1
DOC
CR1
BL1
CR9
0
0
CR8
CR0
BL0
WC
0
0
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