On Thu, Sep 29, 2011 at 10:29 AM, wrote: > > =A0I built a logic analyzer many years ago that used an oscillator that > would increment the address counter > =A0of some dual port cache RAMS. =A0You could capture using one port of t= he > ram chip, and output the data on the > =A0other port. =A0The dual port rams were from Cypress IIRC, and I believ= e > they were 128K x 9. =A0I used the 9th > =A0bit as a trigger capture bit. After the capture, I would then send the > captured data out to the PC for > =A0display. It worked well. =A0 You might try looking at some of these RA= M > chips. =A0Again, IIRC, they would work > =A0up to about 60 Mhz or so. > Microchip has some serial RAMs that do this. Just keep clocking them and they store a bit with each clock. Design here: http://dangerousprototypes.com/docs/Logic_Shrimp_design_overview --=20 Regards, Mark markrages@gmail --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .