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参数资料
| 型号： | S29CD032G0RFFN003 |
| 厂商： | SPANSION LLC |
| 元件分类： | PROM |
| 英文描述： | 1M X 32 FLASH 2.7V PROM, 48 ns, PBGA80 |
| 封装： | 13 X 11 MM, 1 MM PITCH, LEAD FREE, FORTIFIED, BGA-80 |
| 文件页数： | 30/81页 |
| 文件大小： | 1276K |
| 代理商： | S29CD032G0RFFN003 |
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34
S29CD-G Flash Family
S29CD-G_00_B1 March 3, 2009
Data
Sheet
(Pre limin ar y)
Table 13.1 contains all possible combinations of the DYB, PPB, and PPB lock relating to the status of the
sector.
In summary, if the PPB is set, and the PPB lock is set, the sector is protected and the protection can not be
removed until the next power cycle clears the PPB lock. If the PPB is cleared, the sector can be dynamically
locked or unlocked. The DYB then controls whether or not the sector is protected or unprotected.
If the user attempts to program or erase a protected sector, the device ignores the command and returns to
read mode. A program command to a protected sector enables status polling for approximately 1 s before
the device returns to read mode without having modified the contents of the protected sector. An erase
command to a protected sector enables status polling for approximately 50 s after which the device returns
to read mode without having erased the protected sector.
The programming of the DYB, PPB, and PPB lock for a given sector can be verified by writing a DYB/PPB/
PPB lock verify command to the device.
13.2
Persistent Sector Protection Mode Locking Bit
Like the password mode locking bit, a Persistent Sector Protection mode locking bit exists to guarantee that
the device remain in software sector protection. Once set, the Persistent Sector Protection locking bit
prevents programming of the password protection mode locking bit. This guarantees that an unauthorized
user could not place the device in password protection mode.
13.3
Password Protection Mode
The Password Sector Protection Mode method allows an even higher level of security than the Persistent
Sector Protection Mode. There are two main differences between the Persistent Sector Protection and the
Password Sector Protection Mode:
When the device is first powered on, or comes out of a reset cycle, the PPB Lock bit set to the locked
state, rather than cleared to the unlocked state.
The only means to clear the PPB Lock bit is by writing a unique 64-bit Password to the device.
The Password Sector Protection method is otherwise identical to the Persistent Sector Protection method.
A 64-bit password is the only additional tool utilized in this method.
The password is stored in a one-time programmable (OTP) region of the flash memory. Once the Password
Mode Locking Bit is set, the password is permanently set with no means to read, program, or erase it. The
password is used to clear the PPB Lock bit. The Password Unlock command must be written to the flash,
along with a password. The flash device internally compares the given password with the pre-programmed
password. If they match, the PPB Lock bit is cleared, and the PPBs can be altered. If they do not match, the
flash device does nothing. 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.
Table 13.1 Sector Protection Schemes
DYB
PPB
PPB Lock
Sector State
0
Unprotected—PPB and DYB are changeable
0
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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