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FM22LD16-55-BG Scheda tecnica(PDF) 6 Page - Cypress Semiconductor |
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FM22LD16-55-BG Scheda tecnica(HTML) 6 Page - Cypress Semiconductor |
6 / 14 page FM22LD16 - 256Kx16 FRAM Rev. 3.0 Oct. 2012 Page 6 of 14 Normal Memory Operation Read 24555h? Read 3AAAAh? Any other operation Read 02333h? Read 1CCCCh? Read 000FFh? Read 3EF00? Hold Data Byte Write 1CCCC? Data Complement? y n n n n n y y y y y n y Write 3AAAA? y Write 0FF00? y n Read 00000? Enter new write protect settings n Read 1AAAA? Write 1CCCC? y Drive write protect data out Read 00000? n y n Change Write Protect Settings Read Write Protect Settings Sequence Detector 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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