Echoes from the past...


Em 03/11/2016 13:02, Justin Richards escreveu:
> I am new to GALS (and PALS) and just recently successfully flashed my fir=
st
> GAL16V8A using PALASM to compile and an old EEPROM burner.
>
> I am using it to trigger a data bus read for a given set of addresses.  I
> hacked the equations by looking at examples which seems to work well.
>
> Now I am struggling to implement a flip flop which I think should be a
> trivial task.
>
> The output (Z) is required to toggle every time there is an address match=
..
> i.e. every time X has a positive going edge.
>
> So far I have this
>
> /X =3D /WE * /CS * J*/I*/H*/G*F*/E*/D*C*/B*A + ;Addr 225 [8A25]
> /WE * /CS * J*/I*/H*/G*F*/E*/D*C*/B*/A +;Addr 224 [8A24]
> /WE * /CS * J*/I*/H*/G*F*/E*/D*/C*B*A  +;Addr 223 [8A23]
> /WE * /CS * J*/I*/H*/G*F*/E*/D*/C*B*/A  +;Addr 222 [8A22]
> /WE * /CS * J*/I*/H*/G*F*/E*/D*/C*/B*A +;Addr 221 [8A21]
> /WE * /CS * J*/I*/H*/G*F*/E*/D*/C*/B*/A ;Addr 220 [8A20]
>
> y =3D /X;
>
> which works well but the following fails to compile.
>
> Z =3D /Z;
> Z.clkf =3D X;
>
> Hoping someone may be familiar and set me straight.
>
> Justin


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