Subject: Re: [stella] How do I count WSYNC? From: emooney@xxxxxxxxxxxxxxxx (Erik Mooney) Date: Mon, 24 Aug 1998 23:53:57 GMT |
>I guess the question comes down to this: How many cycles do I have >"_between_ WSYNC's"? I think if I just use all 76 cycles, I don't have >anything to worry about, but I also think that if I use 73 cycles then >hit WSYNC like this: > >LF0BB: STA WSYNC ;3 > >... my timing will be off. Anyway, I hope that's the case, because right >now a line that's taking 76 cycles including a sta WSYNC (I'm counting >the WSYNC as three cycles) is acting like it's screwing up! STA WSYNC requires either four or five cycles to work properly. Both numbers have their advocates on this list; I believe it's five. You're correct in that if you just use all 76 cycles, you don't have anything to worry about, but you must make sure it's 76 cycles *every* time - no branching, or fetches across a page boundary. At any rate, you're safe if you use 71 cycles and then do a STA WSYNC. -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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