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iceprog sram programming not consistent with Lattice application notes #316

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iamhuzhe-nia opened this issue May 30, 2023 · 0 comments

iamhuzhe-nia commented May 30, 2023 •

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Just reading iceprog.c code: https://github.com/YosysHQ/icestorm/blob/master/iceprog/iceprog.c#L893

to write to SRAM directly.

According to Lattice notes: https://www.latticesemi.com/-/media/LatticeSemi/Documents/ApplicationNotes/IK/FPGA-TN-02001-3-4-iCE40-Programming-Configuration.ashx?document_id=46502
(page 31, figure 13.2)

there is 8 dummy clocks (while SPI_SS is high) before writing SPI data to ICE40.

That 8 dummy clocks doesn't exist in iceprog.c

Don't know if it affects anything, just to point out the difference

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