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参数资料
| 型号： | S29CL032J0RQAI033 |
| 厂商： | SPANSION LLC |
| 元件分类： | PROM |
| 英文描述： | 1M X 32 FLASH 3.3V PROM, 48 ns, PQFP80 |
| 封装： | PLASTIC, MO-108CB-1, QFP-80 |
| 文件页数： | 42/79页 |
| 文件大小： | 2994K |
| 代理商： | S29CL032J0RQAI033 |
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March 30, 2009 S29CD-J_CL-J_00_B3
S29CD-J & S29CL-J Flash Family
47
Data
She e t
9.6
Hardware Data Protection Methods
The device offers several methods of data protection by which intended or accidental erasure of any sectors
can be prevented via hardware means. The following subsections describe these methods.
9.6.1
WP# Method
The Write Protect feature provides a hardware method of protecting the two outermost sectors of the large
bank.
If the system asserts VIL on the WP# pin, the device disables program and erase functions in the two
“outermost” boot sectors (8-Kbyte sectors) in the large bank. 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
9.6.2
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.
The command register and all internal program/erase circuits are disabled, and the device resets to reading
array data. Subsequent writes are ignored until VCC is greater than VLKO. The system must provide the
proper signals to the control inputs to prevent unintentional writes when VCC is greater than VLKO.
9.6.3
Write Pulse “Glitch Protection”
Noise pulses of less than 5 ns (typical) on OE#, CE# or WE# do not initiate a write cycle.
9.6.4
Power-Up Write Inhibit
If WE# = CE# = RESET# = 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.
9.6.5
VCC and VIO Power-up And Power-down Sequencing
The device imposes no restrictions on VCC and VIO power-up or power-down sequencing. Asserting RESET#
to VIL is required during the entire VCC and VIO power sequence until the respective supplies reach the
operating voltages. Once VCC and VIO attain the operating voltages, deassertion of RESET# to VIH is
permitted. Refer to timing in Section 18.1 on page 55.
9.6.6
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 (VIL) while OE# is a logical one (VIH).
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