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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ORSPI4 датащи(PDF) 63 Page - Lattice Semiconductor |
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ORSPI4 датащи(HTML) 63 Page - Lattice Semiconductor |
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63 / 263 page  Lattice Semiconductor ORCA ORSPI4 Data Sheet 63 6. In order to avoid straddling packets during a data burst, it is necessary to track the location of an end-of- packet(EOP) within a data burst to insert a dummy word whenever the EOP does not occur within the final 128-bit (16-byte) word of a data burst. If an EOP does not occur during the final 128-bit word of a data burst, then the user must insert a dummy word with the packet error indicator (SPI[A,B]_k_ERR_j) set to 1 and the end of packet indi- cator (SPI[A,B]_k_EOP_j) set to 0. During the dummy write, all byte enables (SPI[A,B]_k_BE_j) should be set to 1 and input data can be set to anything (don’t care). Examples of the placement of the dummy write in relation to the EOP are shown in Figure 24, Figure 25, and Figure 26. Figure 24. Dummy Write Requirement for MIN_BURST_MODE (128-Bit Mode) DUMMY WRITE If EOP occurs in any write EXCEPT last write for a given BURST_VAL, must include 1 dummy write before terminating writes for the port Dummy Write: SPI[A,B]_TX128_ERR = 1 SPI[A,B]_TX128_EOP = 0 SPI[A,B]_TX128_BE[15:0] = 0xFFFF SPI[A,B]_TX128_DATA = Donít Care BURST_VAL = n 1 2 n-1 n 128-bit EOP OK n-2 n-3 If EOP occurs in last write as defined by the BURST_VAL, then no dummy write is required . . . |
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