When working with Cyclone 5 I remember having to buffer PLL output clocks before I can feed them to ALTLVDS. There's a cyclonev_pll_lvds_output in cyclonev_atoms.v I can use.
cyclonev_pll_lvds_output# (
.pll_loaden_enable_disable("true"),
.pll_lvdsclk_enable_disable("true"))
cyclonev_pll_lvds_output_inst (
.ccout({load_unbuf, clk_unbuf}),
.loaden(load_buffed),
.lvdsclk(clk_buffed)
);
Cyclone 10GX appears to require this too. After searching a bit there's a cyclone10gx_lvds_clock_tree inside cyclone10gx_atoms.v that looks suspiciously similar to the Cyclone5 version. So I tried this:
cyclone10gx_lvds_clock_tree lvds_clkbuf (
.lvdsfclk_in(clk_unbuf), .loaden_in(load_unbuf),
.lvdsfclk_out(clk_buffed), .loaden_out(load_buffed),
.lvdsfclk_top_out(), .loaden_top_out(),
.lvdsfclk_bot_out(), .loaden_bot_out()
);
However Quartus crashed when compiling. Submitted automated crash report and everything.
But am I on the right track though?
