ORSPI4 datasheet(63/263 Pages) LATTICE

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ORCA ORSPI4 Data Sheet

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

n-1

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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