程序代碼保護和授權管理解決方案-資料下載頁
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【正文】 e switch ?DS2406 2 I./Os with 1k EPROM ?DS2408 8 I/Os with 1k EEPROM ?DS2409 (Coupler) 2021/11/12 中英文日報導航站 24 ? Master Initiated and Controlled ? 3 Phase Transaction ?Device(s) Reset/Synchronization ?ROM Level Command ?Device Level Command 8BIT ROM CMD ROM ID 8BIT FCMD R/W DATA MASTER RESET PULSE DEVICE(S) PRESENCE PULSE RESET SEQUENCE ROM CMD SEQUENCE FUNCTION SEQUENCE RESET SEQUENCE 附錄 B:1Wire 信令格式 2021/11/12 中英文日報導航站 25 1Wire Signaling: Reset/Presence Waveforms M Reset Pulse 480uS S0…S N 15uST60uS 60uS4T240uS 45uS3T180uS Presence Pulse Recovery Pull Up Master Slave Legend: 2021/11/12 中英文日報導航站 26 1Wire Signaling: R/W Bit Waveforms Write 1 Write 0 Read 1 Read 0 15uS T 60uS M M Slave device(s) sample line M Master samples line at 15uS M S0 … S N overdrive resistor T=0 T=15 T=60 Slave device(s) sample line Pull Up Master Slave Legend: 2021/11/12 中英文日報導航站 27 附錄 C：用戶定制 ROM的格式 8BIT 48BIT CRC FAMILY CODE SERIAL NUMBER 8BIT Custom ID (12bits) UserDefined (816 bits) Unique Serialization (2028 bits) FC (8bits) For custom ROM parts the MSB of this byte will always be set to 1b to provide an custom indication. 20, 24, or 28 bit serial number that will be unique relative to each custom device definition. The bit length depends on the number of bits used by the User Defined Subfield. UserDefined Subfield value: 8, 12, or 16 bits. This is a customer defined static value that can be used to provide an indication of model type, feature set, contract manufacturer identifier, etc. 12bit Customer ID value assigned to the pany to which the Custom ROM device is registered. 2021/11/12 中英文日報導航站 28 附錄 D：方案相關的 1Wire產(chǎn)品介紹 SHA1計算模型
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