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X28C64F Datasheet(PDF) 6 Page - Xicor Inc. |
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X28C64F Datasheet(HTML) 6 Page - Xicor Inc. |
6 / 25 page 6 X28C64 HARDWARE DATA PROTECTION The X28C64 provides three hardware features (com- patible with X2864A) that protect nonvolatile data from inadvertent writes. • Noise Protection—A WE pulse typically less than 20ns will not initiate a write cycle. • Default VCC Sense—All write functions are inhibited when VCC is ≤3V typically. • Write Inhibit—Holding either OE LOW, WE HIGH, or CE HIGH will prevent an inadvertent write cycle during power-up and power-down, maintaining data integrity. SOFTWARE DATA PROTECTION The X28C64 offers a software controlled data protection feature. The X28C64 is shipped from Xicor with the software data protection NOT ENABLED; that is, the device will be in the standard operating mode. In this mode data should be protected during power-up/-down operations through the use of external circuits. The host would then have open read and write access of the device once VCC was stable. The X28C64 can be automatically protected during power-up and power-down without the need for external circuits by employing the software data protection fea- ture. The internal software data protection circuit is enabled after the first write operation utilizing the soft- ware algorithm. This circuit is nonvolatile and will remain set for the life of the device unless the reset command is issued. Once the software protection is enabled, the X28C64 is also protected from inadvertent and accidental writes in the powered-on state. That is, the software algorithm must be issued prior to writing additional data to the device. SOFTWARE ALGORITHM Selecting the software data protection mode requires the host system to precede data write operations by a series of three write operations to three specific ad- dresses. Refer to Figure 6 and 7 for the sequence. The three-byte sequence opens the page write window enabling the host to write from one to sixty-four bytes of data*. Once the page load cycle has been completed, the device will automatically be returned to the data protected state. Note: *Once the three-byte sequence is issued it must be followed by a valid byte or page write operation. |
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