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參數(shù)資料
| 型號： | S29CD032J1JFAI122 |
| 廠商： | SPANSION LLC |
| 元件分類： | PROM |
| 英文描述： | 1M X 32 FLASH 2.7V PROM, 54 ns, PBGA80 |
| 封裝： | 13 X 11 MM, 1 MM PITCH, FORTIFIED, BGA-80 |
| 文件頁數(shù)： | 42/78頁 |
| 文件大小： | 1825K |
| 代理商： | S29CD032J1JFAI122 |
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September 27, 2006 S29CD-J_CL-J_00_B1
S29CD-J & S29CL-J Flash Family
45
Pr el im i n a r y
4. The DYB Set or Clear commands for the dynamic sectors signify the protected or unprotected
state of the sectors respectively. However, if there is a need to change the status of the per-
sistently locked sectors, a few more steps are required. First, the PPB Lock Bit must be
cleared by either putting the device through a power-cycle, or hardware reset. The PPBs can
then be changed to reflect the desired settings. Setting the PPB Lock Bit once again locks
the PPBs, and the device operates normally again.
9.5
Password Protection Method
The Password Protection Method allows an even higher level of security than the Persistent Sec-
tor Protection Mode by requiring a 64-bit password for unlocking the device PPB Lock Bit. In
addition to this password requirement, after power-up and reset, the PPB Lock Bit is set "1" in
order to maintain the password mode of operation. Successful execution of the Password Unlock
command by entering the entire password clears the PPB Lock Bit, allowing for sector PPBs
modifications.
Notes:
1. There is no special addressing order required for programming the password. Once the pass-
word is written and verified, the Password Mode Locking Bit must be set in order to prevent
access.
2. The Password Program Command is only capable of programming "0"s. Programming a "1"
after a cell is programmed as a "0" results in a time-out with the cell as a "0". (This is an
OTP area).
3. The password is all "1"s when shipped from the factory.
4. When the password is undergoing programming, Simultaneous Read/Write operation is dis-
abled. Read operations to any memory location returns the programming status. Once
programming is complete, the user must issue a Read/Reset command to return the device
to normal operation.
5. All 64-bit password combinations are valid as a password.
6. There is no means to read, program or erase the password is after it is set.
7. The Password Mode Lock Bit, once set, prevents reading the 64-bit password on the data bus
and further password programming.
8. The Password Mode Lock Bit is not erasable.
9. The exact password must be entered in order for the unlocking function to occur.
10. There is a built-in 2-s delay for each password check. This delay is intended to stop any
efforts to run a program that tries all possible combinations in order to crack the password.
9.6
Hardware Data Protection Methods
The device offers several methods of data protection by which intended or accidental erasure of
any sectors can be prevented via hardware means. The following subsections describe these
methods.
Table 9.1 Sector Protection Schemes
DYB
PPB
PPB Lock
Sector State
00
0
Unprotected—PPB and DYB are changeable
00
1
Unprotected—PPB not changeable, DYB is changeable
01
0
Protected—PPB and DYB are changeable
10
0
11
0
01
1
Protected—PPB not changeable, DYB is changeable
10
1
11
1
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