参数资料
型号: S29GL032A11BFIR10
厂商: Spansion Inc.
英文描述: 64 MEGABIT 32MEGABIT 3.0 BOLT ONLY PAGE MODE FLASH MEMORY
中文描述: 64兆位32MEGABIT 3.0螺栓只页面模式闪存
文件页数: 33/88页
文件大小: 1425K
代理商: S29GL032A11BFIR10
January 28, 2005 S29GLxxxA_00_A2
S29GLxxxA MirrorBit Flash Family
37
Advance
Information
Figure 2, except that RESET# may be at either VIH or VID. This allows in-sys-
tem protection of the Secured Silicon Sector without raising any device pin to
a high voltage. Note that this method is only applicable to the Secured Silicon
Sector.
Write the three-cycle Enter Secured Silicon Sector Region command se-
quence, and then use the alternate method of sector protection described in
Once the Secured Silicon Sector is programmed, locked and verified, the system
must write the Exit Secured Silicon Sector Region command sequence to return
to reading and writing within the remainder of the array.
Factory Locked: Secured Silicon Sector Programmed and
Protected At the Factory
In devices with an ESN, the Secured Silicon Sector is protected when the device
is shipped from the factory. The Secured Silicon Sector cannot be modified in any
way. An ESN Factory Locked device has an 16-byte random ESN at addresses
000000h–000007h. Please contact your sales representative for details on order-
ing ESN Factory Locked devices.
Customers may opt to have their code programmed by the factory through the
Spansion programming service (Customer Factory Locked). The devices are then
shipped from the factory with the Secured Silicon Sector permanently locked.
Contact your sales representative for details on using the Spansion programming
service.
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. Note that if WP#/ACC is at VIL
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 25 and Table
26 for command 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
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