參數(shù)資料
型號(hào)： W78M32V-XBX
英文描述： 8Mx32 Flash 3.3V Page Mode Simultaneous Read/Write Operation Multi-Chip Package
中文描述： 8Mx32閃光3.3V的頁(yè)面模式同步讀/寫(xiě)操作多芯片封裝
文件頁(yè)數(shù)： 19/54頁(yè)
文件大小： 756K
代理商： W78M32V-XBX
19
White Electronic Designs Corporation (602) 437-1520 www.wedc.com
White Electronic Designs
W78M32V-XBX
April 2006
Rev. 3
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
Persistent Protection Bit Lock
The Persistent Protection Bit (PPB) Lock is a volatile bit that
reflects the state of the Password Mode Locking Bit after
power-up reset. If the Password Mode Lock Bit is also set
after a hardware reset (RESET# asserted) or a power-up
reset, the ONLY means for clearing the PPB Lock Bit in
Password Protection Mode is to issue the Password Unlock
command. Successful execution of the Password Unlock
command clears the PPB Lock Bit, allowing for sector PPBs
modifications. Asserting RESET#, taking the device through
a power-on reset, or issuing the PPB Lock Bit Set command
sets the PPB Lock Bit to a “1” when the Password Mode
Lock Bit is not set.
If the Password Mode Locking Bit is not set, including
Persistent Protection Mode, the PPB Lock Bit is cleared
after power-up or hardware reset. The PPB Lock Bit is set
by issuing the PPB Lock Bit Set command. Once set the only
means for clearing the PPB Lock Bit is by issuing a hardware
or power-up reset. The Password Unlock command is
ignored in Persistent Protection Mode.
HIGH VOLTAGE SECTOR PROTECTION
Sector protection and unprotection may also be implemented
using programming equipment. The procedure requires
high voltage (V
ID
) to be placed on the RESET# pin. Refer
to
Figure 2
for details on this procedure. Note that for sector
unprotect, all unprotected sectors must first be protected
prior to the first sector write cycle.
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