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参数资料
| 型号： | S29WS064N0PBAW011 |
| 厂商： | Spansion Inc. |
| 英文描述： | 256/128/64 MEGABIT CMOS 1.8 VOLT ONLY SIMULTANEOUS READ/WRITE BURST MODE FLASH MEMORY |
| 中文描述： | 256/128/64兆位的CMOS 1.8伏只有同时读/写突发模式闪存 |
| 文件页数： | 49/99页 |
| 文件大小： | 1091K |
| 代理商： | S29WS064N0PBAW011 |
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January 25, 2005 S29WS-N_00_G0
51
Ad vance
Information
8.1
Lock Register
As shipped from the factory, all devices default to the persistent mode when power is applied, and
all sectors are unprotected, unless otherwise chosen through the DYB ordering option (see Or-
dering Information). 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 part permanently in that mode:
Lock Register Persistent Protection Mode Lock Bit (DQ1)
Lock Register Password Protection Mode Lock Bit (DQ2)
Table 8.1. Lock Register
For programming lock register bits refer to Table 12.2.
Notes
1. If the password mode is chosen, the password must be programmed before setting the cor-
responding lock register bit.
2. After the Lock Register Bits Command Set Entry command sequence is written, reads and
writes for Bank 0 are disabled, while reads from other banks are allowed until exiting this
mode.
3. If both lock bits are selected to be programmed (to zeros) at the same time, the operation
aborts.
4. 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.
After selecting a sector protection method, each sector can operate in any of the following three
states:
1.
Constantly locked. The selected sectors are protected and can not be reprogrammed
unless PPB lock bit is cleared via a password, hardware reset, or power cycle.
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.
These states are controlled by the bit types described in Sections 8.2–8.6.
8.2
Persistent Protection Bits
The Persistent Protection Bits are unique and nonvolatile for each sector and have the same en-
durances as the Flash memory. Preprogramming and verification prior to erasure are handled by
the device, and therefore do not require system monitoring.
Notes
1.
Each PPB is individually programmed and all are erased in parallel.
2.
While programming PPB for a sector, array data can be read from any other bank, ex-
cept Bank 0 (used for Data# Polling) and the bank in which sector PPB is being
programmed.
Device
DQ15-05
DQ4
DQ3
DQ2
DQ1
DQ0
S29WS256N
1
Password
Protection
Mode Lock Bit
Persistent
Protection
Mode Lock Bit
Customer
SecSi Sector
Protection Bit
S29WS128N/
S29WS064N
Undefined
DYB Lock Boot Bit
0 = sectors
power up
protected
1 = sectors
power up
unprotected
PPB One-Time
Programmable Bit
0 = All PPB erase
command disabled
1 = All PPB Erase
command enabled
Password
Protection
Mode Lock Bit
Persistent
Protection
Mode Lock Bit
SecSi Sector
Protection Bit
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