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參數資料
| 型號： | S29CL032J0RFFI110 |
| 廠商： | SPANSION LLC |
| 元件分類： | PROM |
| 英文描述： | 1M X 32 FLASH 3.3V PROM, 48 ns, PBGA80 |
| 封裝： | 13 X 11 MM, 1 MM PITCH, LEAD FREE, FORTIFIED, BGA-80 |
| 文件頁數： | 39/78頁 |
| 文件大小： | 1825K |
| 代理商： | S29CL032J0RFFI110 |
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42
S29CD-J & S29CL-J Flash Family
S29CD-J_CL-J_00_B1 September27,2006
Prel imi n ary
9.1
Advanced Sector Protection Overview
As shipped from the factory, all devices default to the persistent mode when power is applied,
and all sectors are unprotected. The device programmer or host system must then choose which
sector protection method to use. Programming (setting to "0") any one of the following two one-
time programmable, non-volatile bits locks the device permanently in that mode:
Persistent Protection Mode Lock Bit
Password Protection Mode Lock Bit
After selecting a sector protection method, each sector can operate in any of the following three
states:
1. Persistently Locked. A sector is protected and cannot be changed.
2. Dynamically locked. The selected sectors are protected and can be altered via software
commands.
3. Unlocked. The sectors are unprotected and can be erased and/or programmed.
Notes:
1. If the password mode is chosen, the password must be programmed before setting the cor-
responding lock register bit. The user must be sure that the password is correct when the
Password Mode Locking Bit is set, as there is no means to verify the password afterwards.
2. If both lock bits are selected to be programmed (to zeros) at the same time, the operation
aborts.
3. Once the Password Mode Lock Bit is programmed, the Persistent Mode Lock Bit is perma-
nently disabled, and no changes to the protection scheme are allowed. Similarly, if the
Persistent Mode Lock Bit is programmed, the Password Mode is permanently disabled.
4. It is important that the mode is explicitly selected when the device is first programmed,
rather than relying on the default mode alone. This is so that it is impossible for a system
program or virus to later set the Password Mode Locking Bit, which would cause an unex-
pected shift from the default Persistent Sector Protection Mode into the Password Protection
Mode.
5. 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 modifying the con-
tents 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.
6. For the command sequence required for programming the lock register bits, refer to Com-
9.2
Persistent Protection Bits
The Persistent Protection Bits are unique and nonvolatile. A single Persistent Protection Bit is as-
signed to a maximum for four sectors (see the sector address tables for specific sector protection
groupings). All eight-Kbyte boot-block sectors have individual sector Persistent Protection Bits
(PPBs) for greater flexibility.
Notes:
1. Each PPB is individually programmed and all are erased in parallel. There are no means for
individually erasing a specific PPB and no specific sector address is required for this opera-
tion.
2. If a PPB requires erasure, all of the sector PPBs must first be programmed prior to PPB eras-
ing. It is the responsibility of the user to perform the preprogramming operation. Otherwise,
an already erased sector PPB has the potential of being over-erased. There is no hardware
mechanism to prevent sector PPB over-erasure.
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