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FM21L16 データシート(PDF) 6 Page - Ramtron International Corporation |
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FM21L16 データシート(HTML) 6 Page - Ramtron International Corporation |
6 / 15 page FM21L16 - 128Kx16 FRAM Rev. 2.0 Apr. 2011 Page 6 of 15 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 3. The write-protect settings are nonvolatile. The factory default: all blocks are unprotected. Figure 3. Write-Protect State Machine For example, the following sequence write-protects addresses from 0C000h to 13FFFh (sectors 3 & 4): Address Data Read 12555h - Read 1DAAAh - Read 01333h - Read 0ECCCh - Read 000FFh - Read 1FF00h - Write 1DAAAh 18h ; bits 3 & 4 = 1 Write 0ECCCh E7h ; complement of 18h Write 0FF00h - ; Data is don’t care Read 00000h - ; return to Normal Operation |
同様の部品番号 - FM21L16_11 |
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同様の説明 - FM21L16_11 |
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