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S29AL008J70BFI020 Datasheet(PDF) 26 Page - SPANSION

Part # S29AL008J70BFI020
Description  8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
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Manufacturer  SPANSION [SPANSION]
Direct Link  http://www.spansion.com
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S29AL008J70BFI020 Datasheet(HTML) 26 Page - SPANSION

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S29AL008J
S29AL008J_00_11 April 12, 2012
Da ta
Sh e e t
9.1
Hardware Data Protection
The command sequence requirement of unlock cycles for programming or erasing provides data protection
against inadvertent writes (refer to Table 10.1 on page 32 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.
9.1.1
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. 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.
9.1.2
Write Pulse Glitch Protection
Noise pulses of less than 5 ns (typical) on OE#, CE# or WE# do not initiate a write cycle.
9.1.3
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.
9.1.4
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 reading array data on power-up.
4Fh
9Eh
00XXh
WP# Protection
00 = Uniform Device without WP Protect
01 = Boot Device with TOP and Bottom WP Protect
02 = Bottom Boot Device with WP Protect
03 = Top Boot Device with WP Protect
04 = Uniform Device with Bottom WP Protect
05 = Uniform Device with Top WP Protect
06 = Uniform Device with All Sectors WP Protect
50h
A0h
00XXh
Program Suspend
00 = Not Supported, 01 = Supported
Table 9.4 Primary Vendor-Specific Extended Query (Sheet 2 of 2)
Addresses
(Word Mode)
Addresses
(Byte Mode)
Data
Description


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