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DS1986 Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS1986 Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 27 page DS1986 5 of 27 HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2 1-WIRE BUS OTHER DEVICES 64-BIT LASERED ROM Figure 3 8- Bit CRC Code 48- Bit Serial Number 8- Bit Family Code (0FH) MSB LSB MSB LSB MSB LSB 65536-BITS EPROM The memory map in Figure 4 shows the 65536-bit EPROM section of the DS1986 which is configured as 256 pages of 32 bytes each. The 8-bit scratchpad is an additional register that acts as a buffer when programming the memory. Data is first written to the scratchpad and then verified by reading an 16-bit CRC from the DS1986 that confirms proper receipt of the data and address. If the buffer contents are correct, a programming voltage should be applied and the byte of data will be written into the selected address in memory. This process ensures data integrity when programming the memory. The details for reading and programming the 65536-bit EPROM portion of the DS1986 are given in the Memory Function Commands section. BUS MASTER DS1986 COMMAND AVAILABLE DATA FIELD LEVEL: COMMANDS: AFFECTED: READ ROM 64-BIT ROM MATCH ROM 64-BIT ROM SEARCH ROM 64-BIT ROM SKIP ROM N/A OVERDRIVE SKIP ROM N/A OVERDRIVE MATCH ROM 64-BIT ROM WRITE MEMORY 64K BIT EPROM WRITE STATUS EPROM STATUS BYTES READ MEMORY 64K BIT EPROM READ STATUS EPROM STATUS BYTES EXTENDED READ DATA 64K BIT EPROM 1-WIRE ROM FUNCTION COMMANDS (SEE FIGURE 9) DS1986 - SPECIFIC MEMORY FUNCTION COMMANDS (SEE FIGURE 6) |
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