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03/07/06 02:02
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 		 #111463 - not so fast there, Erik
Responding to: ???'s previous message
We don't know which signals he was wanting to monitor. I'm in agreement that what he really should have is a 40 GHz sampling o'scope and a GHz sampling LA. However, in the course of learning to "make-do" he might get by with something less.

You're right in that the "classic" ISA-based PC parallel port, which, apparently, he's not allowed to use, won't operate fast enough to support sampling at a reasonable rate.

However, if he uses a PCI-based (motherboard-based) parallel port, in EPP (NOT ECP!) mode, he can take about 8 samples per microsecond if he does his sampling in a loop and long-word-wide. EPP will shuffle the data words into a byte stream, and reassemble them into the long words once they're in the PC. It's just a software problem at that point. That's not wonderfully fast, but will enable one to do things impossible in the ISA version.

RE


List of 77 messages in thread
TopicAuthorDate
Parallel port Logic Analyser            01/01/70 00:00      
   Maybe I can help ...            01/01/70 00:00      
      Details            01/01/70 00:00      
         Well ... YES!            01/01/70 00:00      
            Oops!            01/01/70 00:00      
               another option            01/01/70 00:00      
               ideas            01/01/70 00:00      
               Try a DOS box            01/01/70 00:00      
                  When things are not going on my way..            01/01/70 00:00      
                     well            01/01/70 00:00      
                        Cost?            01/01/70 00:00      
                        cost            01/01/70 00:00      
                           Options            01/01/70 00:00      
                              ok well            01/01/70 00:00      
                              miniLA            01/01/70 00:00      
                                 Sorry!            01/01/70 00:00      
                                    I don't sell            01/01/70 00:00      
                                    If you want something you can build ...            01/01/70 00:00      
                                 MiniLA?            01/01/70 00:00      
                                    Buying, building and Writing..            01/01/70 00:00      
                                       You've got to decide ...            01/01/70 00:00      
                                       great start!            01/01/70 00:00      
                                          AVR!            01/01/70 00:00      
                                             realterm            01/01/70 00:00      
                                          But they're not reall fast enough            01/01/70 00:00      
                                             Cheat!            01/01/70 00:00      
                                                only if it gains you something            01/01/70 00:00      
                                                   to LA or not to LA            01/01/70 00:00      
                                                      I once made one            01/01/70 00:00      
                                                         cost of time... and price of learning...            01/01/70 00:00      
                                                            there is no such thing            01/01/70 00:00      
                                                               1MHz sampling            01/01/70 00:00      
                                                                  it's not that simple            01/01/70 00:00      
                                                                     architecture            01/01/70 00:00      
   Not sure how it compares            01/01/70 00:00      
      not very useful            01/01/70 00:00      
   there is no way in hades that a "paralle            01/01/70 00:00      
      how fast?            01/01/70 00:00      
      not so fast there, Erik            01/01/70 00:00      
         PCI LPT vs. onboard            01/01/70 00:00      
            Seems a mite slow!            01/01/70 00:00      
         yes, but part of the "software" is Windo            01/01/70 00:00      
            You're right, of course,            01/01/70 00:00      
               all good and well            01/01/70 00:00      
                  wotizit            01/01/70 00:00      
                  That's it, exactly!            01/01/70 00:00      
                     Won't work either            01/01/70 00:00      
                        will work            01/01/70 00:00      
                           yes, but not the way you think            01/01/70 00:00      
                              re FIFO use            01/01/70 00:00      
                              USB+FIFO: the simplest way            01/01/70 00:00      
                                 Have you considered this?            01/01/70 00:00      
                                    simplicity            01/01/70 00:00      
                                       yes, but it's not deterministic            01/01/70 00:00      
                                          YES YES YES            01/01/70 00:00      
                                             What do you mean "forget about..."            01/01/70 00:00      
                                                quick'n'dirty            01/01/70 00:00      
                                                   there are countries with low labor cost            01/01/70 00:00      
                                                      labour cost?            01/01/70 00:00      
                                                   Even if it's 768 TB, it's too small            01/01/70 00:00      
                        think about it some more            01/01/70 00:00      
                     10MHz?            01/01/70 00:00      
                        Not the USB, the FIFO!            01/01/70 00:00      
                           USB logic analyzer            01/01/70 00:00      
                              It's just a transfer mechanism            01/01/70 00:00      
            Zigbee timing            01/01/70 00:00      
               if a byte is 32 then a bit is 4 and you            01/01/70 00:00      
               arrrrrrrrrrrrgh and stuff,just use pci            01/01/70 00:00      
                  Yes, well, what did you expect?            01/01/70 00:00      
                     better mousetrap            01/01/70 00:00      
               I must have been more precise            01/01/70 00:00      
                  but WHEN?            01/01/70 00:00      
                     2420 interface details            01/01/70 00:00      
                        Focus on your current needs            01/01/70 00:00      
                           Thank you            01/01/70 00:00      
   reconstructed website            01/01/70 00:00      
   Update            01/01/70 00:00      

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