Lattice notes

MachXO2/MachXO3

Flash memory

.jed file is the default format generated by Lattice Diamond, so nothing special must be done to generates this file.

File load:

openFPGALoader [-b yourboard] [--flash-sector CFG0] impl1/*.jed

where yourboard may be:

  • machX02EVN

  • machX03EVN

  • machXO3SK

and where --flash-sector CFG0 is needed for the MachXO3D Breakout Board.

.bit may also be used for machXO2

SRAM

To generates .bit file Bitstream file must be checked under Exports Files in Lattice Diamond left panel.

File load:

openFPGALoader [-b yourboard] impl1/*.bit

where yourboard may be:

  • machX02EVN

  • machX03EVN

  • machXO3SK

iCE40

.bin is the default format generated by nextpnr, so nothing special must be done.

Since most ice40 boards uses the same pinout between FTDI and SPI flash a generic ice40_generic board is provided.

For the specific case of the iCE40HXXK-EVB where no onboard programmer is present, please use this:

FTDI

iCE40HXXK-EVB

SI (ADBUS1)

Pin 8

SCK (ADBUS0)

Pin 9

SO (ADBUS2)

Pin 7

CS (ABDUS4)

Pin 10

RST (ADBUS6

Pin 6

DONE (ADBUS7)

Pin 5

Bin file load:

openFPGALoader -b ice40_generic /somewhere/*.bin

Since it’s a direct access to the flash (SPI) the -b option is required.