Legend
L = Logic Low = VIL, H = Logic High = VIH, VHH = 11.5–12.5V, X = Don’t Care, AIN = Address In, DIN = Data In, DOUT = Data Out
Notes
1. Addresses are AMax:A0 in word mode; AMax:A-1 in byte mode.
2. If WP# = VIL, on the outermost sector remains protected. If WP# = VIH, the outermost sector is unprotected. All sectors are unprotected when shipped from the
factory (The Secured Silicon Sector can be factory protected depending on version ordered.)
3. DIN or DOUT as required by command sequence, data polling, or sector protect algorithm.
7.7.7 Accelerated Program
Accelerated single word programming and write buffer programming operations are enabled through the
WP#/ACC pin. This method is faster than the standard program command sequences.
Note
The accelerated program functions must not be used more than 10 times per sector.
If the system asserts VHH on this input, the device automatically enters the aforementioned Unlock Bypass
mode and uses the higher voltage on the input to reduce the time required for program operations. The
system can then use the Write Buffer Load command sequence provided by the Unlock Bypass mode. Note
that if a “Write-to-Buffer-Abort Reset” is required while in Unlock Bypass mode, the full 3-cycle RESET
command sequence must be used to reset the device. Removing VHH from the ACC input, upon completion
of the embedded program operation, returns the device to normal operation.
􀂄 Sectors must be unlocked prior to raising WP#/ACC to VHH.
􀂄 The WP#/ACC pin must not be at VHH for operations other than accelerated programming, or device
damage may result.
􀂄 The WP#/ACC pin must not be left floating or unconnected; inconsistent behavior of the device may result.
用GOOGLE翻译,认真的看了这一段,经测试.
1>.给(16脚)WP#/ACC加12V,或加VCC3.3V的电压还是没有办法解锁.
2>给(14脚)接地断开,也没有办法解锁.
3>同时执行1>和2>,也是没有办法解锁.
另: 看此文件Unlocking the Secrets of Bypass Mode, 是不是可以通过编程解锁呢? 附件为此文档.
[ 本帖最后由 天涯 于 2008-11-6 14:29 编辑 ] |