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FM22L16 Datasheet(PDF) 6 Page - Cypress Semiconductor |
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FM22L16 Datasheet(HTML) 6 Page - Cypress Semiconductor |
6 / 14 page FM22L16 - 256Kx16 FRAM Rev. 3.0 May 2010 Page 6 of 14 reduced by requiring three more write cycles, one that requires an exact inversion of the data byte. A flow chart of the entire write protect operation is shown in Figure 2. The write-protect settings are nonvolatile. The factory default: all blocks are unprotected. Figure 2. Write-Protect State Machine For example, the following sequence write-protects addresses from 18000h to 27FFFh (sectors 3 & 4): Address Data Read 24555h - Read 3AAAAh - Read 02333h - Read 1CCCCh - Read 000FFh - Read 3EF00h - Write 3AAAAh 18h ; bits 3 & 4 = 1 Write 1CCCCh E7h ; complement of 18h Write 0FF00h - ; Data is don’t care Read 00000h - ; return to Normal Operation |
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