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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STPM066S датащи(PDF) 30 Page - STMicroelectronics |
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STPM066S датащи(HTML) 30 Page - STMicroelectronics |
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30 / 67 page  5.1 SPI frame CRC generator The SPI protocol is defined by frames of 32 bits with 5 bits of CRC (Cyclic Redundancy Check) in both input and output directions. The polynomial calculation implemented is: g(x)= x^5 + x^2 + 1 the structure of CRC generator is shown in Figure 19. Structure of CRC generator. Here are the rules: 1. For DI, CNT=DI[21] is ignored when calculating CRC, it means only {DI[31:22],DI[20:5]} is used to calculate CRC. For example, if DI[31:5]=27‘b1000_0010_1011_1111_1111_1111_111, the CRC[4:0]= 5‘b0_0011 2. For DO, DO[21] is ignored when calculating CRC, it means only {DO[31:22],DO[20:5]} is used to calculate CRC. 3. The initial value of CRC generator is 5'b1_1111. 4. MSB (DI[31]) is shift in CRC generator at first. Figure 19. Structure of CRC generator XOR MOSI BIT4 XOR BIT1 BIT0 BIT3 BIT2 GAPG2402160858PS STPM066S SPI frame CRC generator DS12976 - Rev 2 page 30/67 |
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