**From:** Jim Brain (*brain_at_jbrain.com*)

**Date:** 2007-05-28 04:08:19

**Next message:**Bil Herd: "RE: How to design non-trivial cartridges for c-64?"**Previous message:**Pasi Ojala: "Re: How to design non-trivial cartridges for c-64?"**In reply to:**Bil Herd: "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?"**Reply:**André Fachat: "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? Message was sent through the cbm-hackers mailing list

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