ORSPI4 datasheet(60/263 Pages) LATTICE

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ORCA ORSPI4 Data Sheet

Figure 21. Write Synchronization Sequence for 32-Bit Mode

Transmit Calendar

Minimum Port Gap

for 32-bit Mode

Port 0

Port 1

Port 2

Port 3

Port 0

Minimum separation between repeating

port numbers in Transmit Calendar = 4 for

32-bit mode to allow time to load Transmit

FIFOs for data bursts of any length

Each port in a minimum separation must

be located in a different bank

Set equal

BURST_VAL

for all ports

32-bit Mode (BURST_VAL = 4 example)

SPI[A,B]_k_CLK_j

Port 0

Port 1

Port 2

Port 3

Port 0

. . .

1 port duration =

BURST_VAL

clock cycles

End last write no later

than 2 clock cycles before

end of port cycle*

Start 1 st write no sooner than 6

clock cycles before beginning of

initial port cycle*

End of data

burst read for

Port 0

. . .

* Rules valid for any value of

BURST_VAL in 32-bit mode

. . .

SPI[A,B]_k_PORT_ID

Range for Transmit FIFO writes

Port 0, write 1

Port 0, write 2

Port 0, write 3

Port 0, write 4

Conditions for writing to transmit FIFO:

1. If BURST_VAL worth of data is ready to be transmitted

and

2. Port status is not SATISFIED

and

3. Within valid time to load portís transmit FIFO as shown above

then

OK to load transmit FIFO with BURST_VAL of data for that port

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