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S29AL008J70BFI020 Datasheet(PDF) 26 Page - SPANSION |
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S29AL008J70BFI020 Datasheet(HTML) 26 Page - SPANSION |
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26 / 54 page  26 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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