**From:** André Fachat (*afachat_at_gmx.de*)

**Date:** 2007-05-28 14:26:46

**Next message:**Bil Herd: "RE: How to design non-trivial cartridges for c-64?"**Previous message:**Jim Brain: "Re: How to design non-trivial cartridges for c-64?"**In reply to:**Jim Brain: "Re: How to design non-trivial cartridges for c-64?"**Next in thread:**Bil Herd: "RE: How to design non-trivial cartridges for c-64?"**Reply:**Bil Herd: "RE: How to design non-trivial cartridges for c-64?"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ] [ attachment ]

> Bil Herd wrote: > > The area you have to watch is that the data is valid for only a short > > period after Phi goes low, known as the hold time. Holdtimes are as > > short as 10-20 ns (shorter if using Phi2) which means that if you have > > too much logic in line to create the strobe, the data goes away before > > the strobe (took you longer than 10ns to decide to do something). Rule > > of thumb is the strobe has time for only one level of TTL type logic on > > anything trying to capture data. > > > So, for something a bit more time intensive, are there any suggestions? > Delay after Phi2 going Hi to start the work? You can delay the data by feeding it through a buffer (e.g. 74ls245) first. André -- GMX FreeMail: 1 GB Postfach, 5 E-Mail-Adressen, 10 Free SMS. Alle Infos und kostenlose Anmeldung: http://www.gmx.net/de/go/freemail Message was sent through the cbm-hackers mailing list

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