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DS2432 Datasheet(PDF) 11 Page - Dallas Semiconductor |
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DS2432 Datasheet(HTML) 11 Page - Dallas Semiconductor |
11 / 30 page PRELIMINARY DS2432 11 of 30 Memory and SHA Functions Flow Chart (continued) Figure 7 33h Compute Next Secret ? Valid Data Address ? Y N Bus Master TX TA1 (T7:T0), TA2 (T15:T8) Y Bus Master RX “1”s Master TX Reset ? Y N * 1-Wire idle high for power Note: The master must first load the scratchpad with a partial secret of 8 bytes From Figure 7 3 rd Part To Figure 7 3 rd Part From Figure 7 5 th Part To Figure 7 5 th Part N N SHA Engine Computes Message Authentication Code of Current Secret, Page Data, and 8 Byte Partial Secret in Scratchpad DS2432 Copies a Partial MAC to the Secret Register Master TX Reset ? Master TX Reset ? Y N DS2432 TX “1” DS2432 TX “0” N Y DS2432 fills Scratchpad with AAh * * Write- Protected ? Y |
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