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< title > Gowin notes — openFPGALoader: universal utility for programming FPGA latest documentation< / title >
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< section id = "gowin-notes" >
< span id = "gowin" > < / span > < h1 > Gowin notes< a class = "headerlink" href = "#gowin-notes" title = "Link to this heading" > ¶< / a > < / h1 >
< section id = "gowin-gw1n" >
< h2 > GOWIN GW1N< a class = "headerlink" href = "#gowin-gw1n" title = "Link to this heading" > ¶< / a > < / h2 >
< div class = "admonition note" >
< p class = "admonition-title" > Note< / p >
< ul class = "simple" >
< li > < p > Trenz TEC0117< / p > < / li >
< li > < p > Sipeed Tang Nano< / p > < / li >
< li > < p > Sipeed Tang Nano 4K< / p > < / li >
< li > < p > Honeycomb< / p > < / li >
< li > < p > RUNBER< / p > < / li >
< / ul >
< / div >
< p > < code class = "docutils literal notranslate" > < span class = "pre" > .fs< / span > < / code > file is the default format generated by < em > Gowin IDE< / em > , so nothing special must be done to generates this file.< / p >
< p > Since the same file is used for SRAM and Flash a CLI argument is used to specify the destination.< / p >
< section id = "flash-sram" >
< h3 > Flash SRAM< a class = "headerlink" href = "#flash-sram" title = "Link to this heading" > ¶< / a > < / h3 >
< p > with < code class = "docutils literal notranslate" > < span class = "pre" > -m< / span > < / code > :< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > openFPGALoader< span class = "w" > < / span > -m< span class = "w" > < / span > -b< span class = "w" > < / span > BOARD_NAME< span class = "w" > < / span > impl/pnr/*.fs
< / pre > < / div >
< / div >
< p > where < code class = "docutils literal notranslate" > < span class = "pre" > BOARD_NAME< / span > < / code > is:< / p >
< ul class = "simple" >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > tec0117< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > tangnano< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > tangnano1k< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > tangnano4k< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > tangnano9k< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > tangnano20k< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > tangprimer20k< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > runber< / span > < / code > < / p > < / li >
< / ul >
< / section >
< section id = "flash" >
< h3 > Flash< a class = "headerlink" href = "#flash" title = "Link to this heading" > ¶< / a > < / h3 >
< div class = "admonition attention" >
< p class = "admonition-title" > Attention< / p >
< p > Only with Trenz TEC0117 and runber.< / p >
< / div >
< p > with < code class = "docutils literal notranslate" > < span class = "pre" > -f< / span > < / code > , file load:< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > openFPGALoader< span class = "w" > < / span > -f< span class = "w" > < / span > -b< span class = "w" > < / span > BOARD_NAME< span class = "w" > < / span > impl/pnr/*.fs
< / pre > < / div >
< / div >
< p > where < code class = "docutils literal notranslate" > < span class = "pre" > BOARD_NAME< / span > < / code > is:< / p >
< ul class = "simple" >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > tec0117< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > runber< / span > < / code > < / p > < / li >
< / ul >
< p > It’ < code class = "docutils literal notranslate" > < span class = "pre" > --external-flash< / span > < / code > instead of
< code class = "docutils literal notranslate" > < span class = "pre" > -f< / span > < / code > .< / p >
< div class = "admonition note" >
< p class = "admonition-title" > Note< / p >
< p > Gowin’ < strong > JTAGSEL_N< / strong > (pin 08 for < em > GW1N-4K< / em > ) is used as a GPIO.
To recover you have to pull down this pin (before power up) to recover JTAG interface (< em > UG292 - JTAGSELL_N section< / em > ).< / p >
< / div >
< / section >
< section id = "user-flash" >
< h3 > User Flash< a class = "headerlink" href = "#user-flash" title = "Link to this heading" > ¶< / a > < / h3 >
< div class = "admonition attention" >
< p class = "admonition-title" > Attention< / p >
< p > User Flash support is based on reverse engineering of the JTAG protocol. This functionality should be considered
experimental as it hasn’ < / p >
< / div >
< p > Gowin FPGA come with extra flash space that can be read and written from the programmable logic (“User Flash”). This
flash section can also be programmed via the JTAG interface:< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > openFPGALoader< span class = "w" > < / span > --write-flash< span class = "w" > < / span > /path/to/bitstream.fs< span class = "w" > < / span > --user-flash< span class = "w" > < / span > /path/to/flash.bin
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