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參數(shù)資料
| 型號： | S29CL032J0JFAM020 |
| 廠商： | SPANSION LLC |
| 元件分類： | PROM |
| 英文描述： | 1M X 32 FLASH 3.3V PROM, 54 ns, PBGA80 |
| 封裝： | 13 X 11 MM, 1 MM PITCH, FORTIFIED, BGA-80 |
| 文件頁數(shù)： | 38/79頁 |
| 文件大?。?/td> | 2994K |
| 代理商： | S29CL032J0JFAM020 |
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March 30, 2009 S29CD-J_CL-J_00_B3
S29CD-J & S29CL-J Flash Family
43
Data
She e t
9.1
Advanced Sector Protection Overview
As shipped from the factory, all devices default to the persistent mode when power is applied, and all sector
groups are unprotected. The device programmer or host system must then choose which sector group
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 group protection method, each sector group can operate in any of the following three
states:
1. Persistently Locked. A sector group is protected and cannot be changed.
2. Dynamically locked. The selected sector groups are protected and can be altered via software
commands.
3. Unlocked. The sector groups 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
corresponding 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 permanently
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 unexpected 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 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.
6. For the command sequence required for programming the lock register bits, refer to Section 20.1,
9.2
Persistent Protection Bits
The Persistent Protection Bits are unique and nonvolatile. A single Persistent Protection Bit is assigned 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 operation.
2. If a PPB requires erasure, all of the sector PPBs must first be programmed prior to PPB erasing. 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.
3. If the PPB Lock Bit is set, the PPB Program or erase command does not execute and times-out
without programming or erasing the PPB.
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