参数资料
型号: S75PL127JCDBFWB0
厂商: Spansion Inc.
英文描述: Power supply woltage of 2.7 to 3.1 volt
中文描述: 功率2月7号至三月一日伏的电源woltage
文件页数: 26/183页
文件大小: 4247K
代理商: S75PL127JCDBFWB0
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122
S29GLxxxN MirrorBitTM Flash Family
S29GLxxxN_MCP_A1 December 15, 2004
Advance
Info rmation
Write Protect (WP#)
The Write Protect function provides a hardware method of protecting the first or
last sector group without using VID. Write Protect is one of two functions provided
by the WP#/ACC input.
If the system asserts VIL on the WP#/ACC pin, the device disables program and
erase functions in the first or last sector group independently of whether those
sector groups were protected or unprotected using the method described in“Ad-
when the device is in the standby mode, the maximum input load current is in-
If the system asserts VIH on the WP#/ACC pin, the device reverts to
whether the first or last sector was previously set to be protected or un-
protected using the method described in “Sector Group Protection and
Unprotection”. Note that WP# has an internal pullup; when uncon-
nected, WP# is at VIH.
Hardware Data Protection
The command sequence requirement of unlock cycles for programming or erasing
provides data protection against inadvertent writes (refer to Table 12 for com-
mand definitions). In addition, the following hardware data protection measures
prevent accidental erasure or programming, which might otherwise be caused by
spurious system level signals during VCC power-up and power-down transitions,
or from system noise.
Low VCC Write Inhibit
When VCC is less than VLKO, the device does not accept any write cycles. This pro-
tects data during VCC power-up and power-down. The command register and all
internal program/erase circuits are disabled, and the device resets to the read
mode. Subsequent writes are ignored until VCC is greater than VLKO. The system
must provide the proper signals to the control pins to prevent unintentional writes
when VCC is greater than VLKO.
Write Pulse “Glitch” Protection
Noise pulses of less than 5 ns (typical) on OE#, CE# or WE# do not initiate a write
cycle.
Logical Inhibit
Write cycles are inhibited by holding any one of OE# = VIL, CE# = VIH or WE# =
VIH. To initiate a write cycle, CE# and WE# must be a logical zero while OE# is a
logical one.
Power-Up Write Inhibit
If WE# = CE# = VIL and OE# = VIH during power up, the device does not accept
commands on the rising edge of WE#. The internal state machine is automatically
reset to the read mode on power-up.
Common Flash Memory Interface (CFI)
The Common Flash Interface (CFI) specification outlines device and host system
software interrogation handshake, which allows specific vendor-specified soft-
ware algorithms to be used for entire families of devices. Software support can
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