@oe1cxw http://www.clifford.at/icestorm/io_tile.html … Rereading b/c I didn't learn the first time. Is `fabout` an internal IO tile signal/doesn't map to SB_IO?
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each IO tile has two SB_IOs and some routing resources. fabout is a routing resource driving off-fabric stuff (like PLL ctrl inputs)
Just search for "fabout" on that page for a list of things connected to the fabout pin of various IO tiles.
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Yes, I saw that :). Read about that when I was wondering "how are internal signals routed to global buffers?" earlier.
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