On 29/03/2015, at 9:19 am, Adam Jensen <[email protected]> wrote: > On Sat, 28 Mar 2015 08:47:36 +0100 > tgingold <[email protected]> wrote: > >> I agree. The waveform looks correct. > > Thanks for the sanity check, you're right - ModelSim produces exactly the > same results as GHDL (I installed [Libero IDE][1] on [Scientific Linux][2] on > [VirtualBox][3] on a little [Lubuntu][4] x86 workstation (major PITA) and ran > the simulation).
There's also Nick Gasson's nvc analyzer/simulator, while not as feature rich as ghdl easily adequate for this model. It also gives the same answer: From a hardware design perspective you have a symbol rate for d1/d2 that doesn't match your clock rate. At best it's a phase detector telling us d1 occurs at or before clk and d2 occurs after clk.
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