Hi all,

We have prototyped our design with icebreaker board. Now we designed a new PCB with just ice40up5k and SPI flash chip. I used this FTDI board to upload my bitstream using radiant programmer.

Everything worked perfectly till here, SPI flash is erased, bit stream upload successful, but FPGA is not booting the code from the SPI flash, CDONE LED is not glowing, no signs of life from FPGA.

I cross checked my schematics with the lattice evalboard schematics and found that I need to cross the MOSI & MISO lines between flash and FPGA. I reworked my PCB cutting the traces and cross soldering them. No luck with that too. I am attaching my schematics, can you please help me find what am I doing wrong please?

 

The schematic is tedious to read, not drawn at all for comprehension, only to create a netlist.
I looked for a few seconds and gave up.

 

The schematic is tedious to read, not drawn at all for comprehension, only to create a netlist.
I looked for a few seconds and gave up.

Oops, I understand everyone has a different way to draw schematics, it's actually a searchable PDF so people can search the net name and find it easily. I kept it in one page to make it easier to read.

 

Since it is a custom board, the problem may happen due to manufacturing error. If you have a multimeter, check the PCB against your schematic. See if there is any broken traces or unwanted short circuit.

 

Since it is a custom board, the problem may happen due to manufacturing error. If you have a multimeter, check the PCB against your schematic. See if there is any broken traces or unwanted short circuit.

Hi I have checked the schematics already, that's how I found about the reversal of MISO and MOSI lines between SPI lines. Remaining connections seems to be fine.

 

Hi I have checked the schematics already, that's how I found about the reversal of MISO and MOSI lines between SPI lines. Remaining connections seems to be fine.

I see. Fix this error first and check if the board behaves as expected. If not, some more issues still persist.

 

I see. Fix this error first and check if the board behaves as expected. If not, some more issues still persist.

huh?? This feels like a very blanket answer, I do know if it doesn't behaves as expected some issue still exist. This comment didn't help at all.