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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： | 55/99页 |
| 文件大小： | 1091K |
| 代理商： | S29WS064N0PBAW011 |
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January 25, 2005 S29WS-N_00_G0
57
Ad vance
Information
8.6
Advanced Sector Protection Software Examples
Table 8.2 contains all possible combinations of the DYB, PPB, and PPB Lock Bit relating to the sta-
tus of the sector. In summary, if the PPB Lock Bit is locked (set to “0”), no changes to the PPBs
are allowed. The PPB Lock Bit can only be unlocked (reset to “1”) through a hardware reset or
power cycle. See also Figure 8.1 for an overview of the Advanced Sector Protection feature.
8.7
Hardware Data Protection Methods
The device offers two main types of data protection at the sector level via hardware control:
When WP# is at VIL, the four outermost sectors are locked (device specific).
When ACC is at VIL, all sectors are locked.
There are additional methods by which intended or accidental erasure of any sectors can be pre-
vented via hardware means. The following subsections describes these methods:
8.7.1.
WP# Method
The Write Protect feature provides a hardware method of protecting the four outermost sectors.
This function is provided by the WP# pin and overrides the previously discussed Sector Protec-
tion/Unprotection method.
If the system asserts VIL on the WP# pin, the device disables program and erase functions in the
“outermost” boot sectors. The outermost boot sectors are the sectors containing both the lower
and upper set of sectors in a dual-boot-configured device.
If the system asserts VIH on the WP# pin, the device reverts to whether the boot sectors were
last set to be protected or unprotected. That is, sector protection or unprotection for these sectors
depends on whether they were last protected or unprotected.
Note that the WP# pin must not be left floating or unconnected as inconsistent behavior of the
device may result.
The WP# pin must be held stable during a command sequence execution
8.7.2 ACC Method
This method is similar to above, except it protects all sectors. Once ACC input is set to VIL, all
program and erase functions are disabled and hence all sectors are protected.
8.7.3 Low VCC Write Inhibit
When VCC is less than VLKO, the device does not accept any write cycles. This protects data during
VCC power-up and power-down.
Table 8.2. Sector Protection Schemes
Unique Device PPB Lock Bit
0 = locked
1 = unlocked
Sector PPB
0 = protected
1 = unprotected
Sector DYB
0 = protected
1 = unprotected
Sector Protection Status
Any Sector
0
x
Protected through PPB
Any Sector
0
x
Protected through PPB
Any Sector
0
1
Unprotected
Any Sector
0
1
0
Protected through DYB
Any Sector
1
0
x
Protected through PPB
Any Sector
1
0
x
Protected through PPB
Any Sector
1
0
Protected through DYB
Any Sector
1
Unprotected
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| S29WS064N0PBAW012 | 制造商:SPANSION 制造商全称:SPANSION 功能描述:256/128/64 Megabit (16/8/4 M x 16-Bit) CMOS 1.8 Volt-only Simultaneous Read/Write, Burst Mode Flash Memory |
| S29WS064N0PBAW013 | 制造商:SPANSION 制造商全称:SPANSION 功能描述:256/128/64 MEGABIT CMOS 1.8 VOLT ONLY SIMULTANEOUS READ/WRITE BURST MODE FLASH MEMORY |
| S29WS064N0PBAW110 | 制造商:SPANSION 制造商全称:SPANSION 功能描述:256/128/64 MEGABIT CMOS 1.8 VOLT ONLY SIMULTANEOUS READ/WRITE BURST MODE FLASH MEMORY |
| S29WS064N0PBAW111 | 制造商:SPANSION 制造商全称:SPANSION 功能描述:256/128/64 MEGABIT CMOS 1.8 VOLT ONLY SIMULTANEOUS READ/WRITE BURST MODE FLASH MEMORY |
| S29WS064N0PBAW112 | 制造商:SPANSION 制造商全称:SPANSION 功能描述:256/128/64 MEGABIT CMOS 1.8 VOLT ONLY SIMULTANEOUS READ/WRITE BURST MODE FLASH MEMORY |
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