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X88064P Datasheet(PDF) 7 Page - Xicor Inc. |
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X88064P Datasheet(HTML) 7 Page - Xicor Inc. |
7 / 15 page X88064 7 DATA PROTECTION The X88064 provides two levels of data protection through software control. There is a global software data protection feature similar to the industry standard for E2PROMs and a new Block Lock Control providing a secondary level of data security. SOFTWARE DATA PROTECTION The X88064 offers a software controlled data protection feature. The X88064 is shipped from Xicor with the soft- ware 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 then has open read and write access of the device once VCC is stable. The X88064 can be automatically protected during power-up/down without the need for external circuits by employing the software data protection feature. The inter- nal software data protection circuit is enabled after the first write operation utilizing the software algorithm. This circuit is nonvolatile and will remain set for the life of the device unless the SDP deactivation command is issued. Once the software protection is enabled, the X88064 is also protected from inadvertent and accidental writes in the powered-up state. That is, the SDP software algo- rithm must be issued prior to writing additional data to the device. Writing with SDP Enabled SEQUENCE TO DEACTIVATE SOFTWARE DATA PROTECTION WRITE AA TO X555 WRITE 55 TO XAAA WRITE A0 TO X555 PERFORM BYTE OR PAGE WRITE OPERATIONS WAIT tWC EXIT ROUTINE X = Address bit (A12) of 7023 FRM F06 the byte being updated. WRITE AA to 555 EXIT ROUTINE WRITE 55 to AAA WRITE A0 to 555 WRITE AA to 555 WRITE 80 to AAA WAIT OF twc |
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