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CAT28C256N-15T Datasheet(PDF) 10 Page - Catalyst Semiconductor |
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CAT28C256N-15T Datasheet(HTML) 10 Page - Catalyst Semiconductor |
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10 / 12 page  CAT28C256 10 Doc. No. 1004, Rev. D To activate the software data protection, the device must be sent three write commands to specific addresses with specific data (Figure 9). This sequence of commands (along with subsequent writes) must adhere to the page write timing specifications (Figure 11). Once this is done, all subsequent byte or page writes to the device must be preceded by this same set of write commands. The data protection mechanism is activated until a deactivate sequence is issued regardless of power on/off transi- tions. This gives the user added inadvertent write pro- tection on power-up in addition to the hardware protec- tion provided. To allow the user the ability to program the device with an EEPROM programmer (or for testing purposes) there is a software command sequence for deactivating the data protection. The six step algorithm (Figure 10) will reset the internal protection circuitry, and the device will return to standard operating mode (Figure 12 provides reset timing). After the sixth byte of this reset sequence has been issued, standard byte or page writing can commence. Figure 11. Software Data Protection Timing CE WE tWP AA 5555 55 2AAA A0 5555 DATA ADDRESS tBLC tWC BYTE OR PAGE WRITES ENABLED Figure 12. Resetting Software Data Protection Timing CE WE AA 5555 55 2AAA DATA ADDRESS tWC 80 5555 AA 5555 55 2AAA 20 5555 SDP RESET DEVICE UNPROTECTED |
Número de pieza similar - CAT28C256N-15T |
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Descripción similar - CAT28C256N-15T |
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