S29CD016G SPANSION, S29CD016G Datasheet - Page 29

• 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

November 5, 2004 S29CD016_00_A4
DYB
0
0
0
1
1
the PPB and the DYB related to that sector. For the sectors that have the PPBs
cleared, the DYBs control whether or not the sector is protected or unprotected.
By issuing the DYB Write command sequences, the DYBs are set or cleared, thus
placing each sector in the protected or unprotected state. These are the so-called
Dynamic Locked or Unlocked states. They are called dynamic states because
it is very easy to switch back and forth between the protected and unprotected
conditions. This allows software to easily protect sectors against inadvertent
changes yet does not prevent the easy removal of protection when changes are
needed. The DYBs maybe set or cleared as often as needed.
The PPBs allow for a more static, and difficult to change, level of protection. The
PPBs retain their state across power cycles because they are Non-Volatile. Indi-
vidual PPBs are set with a command but must all be cleared as a group through
a complex sequence of program and erasing commands. The PPBs are limited to
100 erase cycles.
The PPB Lock bit adds an additional level of protection. Once all PPBs are pro-
grammed to the desired settings, the PPB Lock may be set to “1”. Setting the PPB
Lock disables all program and erase commands to the Non-Volatile PPBs. In ef-
fect, the PPB Lock Bit locks the PPBs into their current state. The only way to clear
the PPB Lock is to go through a power cycle. System boot code can determine if
any changes to the PPB are needed e.g. to allow new system code to be down-
loaded. If no changes are needed then the boot code can set the PPB Lock to
disable any further changes to the PPBs during system operation.
The WP# write protect pin adds a final level of hardware protection to the two
outermost 8 Kbytes sectors in the 75% bank. When this pin is low it is not pos-
sible to change the contents of these two sectors.
It is possible to have sectors that are persistently locked, and sectors that are left
in the dynamic state. The sectors in the dynamic state are all unprotected. If
there is a need to protect some of them, a simple DYB Write command sequence
is all that is necessary. The DYB write command for the dynamic sectors switch
the DYBs to signify protected and unprotected, respectively. If there is a need to
change the status of the persistently locked sectors, a few more steps are re-
quired. First, the PPB Lock bit must be disabled by either putting the device
through a power-cycle, or hardware reset. The PPBs can then be changed to re-
flect the desired settings. Setting the PPB lock bit once again locks the PPBs, and
the device operates normally again.
Note: to achieve the best protection, it’s recommended to execute the PPB lock
bit set command early in the boot code, and protect the boot code by holding
WP# = V
PPB
IL
0
0
1
0
1
A d v a n c e
.
Table 11. Sector Protection Schemes (Sheet 1 of 2)
PPB Lock
0
1
0
0
0
I n f o r m a t i o n
S29CD016G
Unprotected—PPB and DYB are changeable
Unprotected—PPB not changeable, DYB is changeable
Protected—PPB and DYB are changeable
Sector State
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