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ORSPI4 bảng dữ liệu(PDF) 63 Page - Lattice Semiconductor

tên linh kiện ORSPI4
Giải thích chi tiết về linh kiện  Dual SPI4 Interface and High-Speed SERDES FPSC
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ORSPI4 bảng dữ liệu(HTML) 63 Page - Lattice Semiconductor

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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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