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???
05/14/09 12:33
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 		 #165328 - the "classical" timing
Responding to: ???'s previous message
Very generally, the '51 derivatives split to two cathegories:

12-, 6- and 2-clockers (the latter is exclusively the P89LPC9xx family) follow the "classical" timing (instruction-cycle-per-instruction structure).

4- and 1-clockers follow roughly a instruction-cycle-per-instruction-fetch scheme, with a cycle or two added for jumps/calls/rets. MUL and DIV vary wildly.

Methink, in the '51 context, the single-clocker has already established meaning and couldn't really be called a hype. What's real hype is to claim that an (1, 4)-clocker is 12/(1, 4)-times faster than the classics (at the same frequency).

JW


List of 74 messages in thread
TopicAuthorDate
max clk freq            01/01/70 00:00      
   Which            01/01/70 00:00      
   300MHz            01/01/70 00:00      
      .            01/01/70 00:00      
         Does that make it effectively 600MHz, then...?            01/01/70 00:00      
            That are the links I found...            01/01/70 00:00      
               Interesting item, but did you notice ... ?            01/01/70 00:00      
                  300Mips, equivalent to 3.6GHz!            01/01/70 00:00      
                     That's slightly misleading ...            01/01/70 00:00      
                        You sure about your math?            01/01/70 00:00      
                           It's confusing ... typical marketing drivel            01/01/70 00:00      
                              Based on the claims you posted            01/01/70 00:00      
                                 Those aren't my claims!            01/01/70 00:00      
                                    Read comments _before_ (not) answering them            01/01/70 00:00      
                                       Architecture speed            01/01/70 00:00      
                                          That was my take too            01/01/70 00:00      
                                             Of course, it does not depend on CLK frequency!            01/01/70 00:00      
                              I cannot see a confusion            01/01/70 00:00      
                                 Not all one-clocker mfg's make the same claims            01/01/70 00:00      
                                    But...            01/01/70 00:00      
                                 comparison of 12- and less-clockers            01/01/70 00:00      
                                    Very nice!            01/01/70 00:00      
                                    Cool!            01/01/70 00:00      
                                    Good overview            01/01/70 00:00      
               Another link            01/01/70 00:00      
                  Dhrystone?            01/01/70 00:00      
                     Yes ... one could argue that the core is hobbled            01/01/70 00:00      
                        to sell IS useful... ;-)            01/01/70 00:00      
                     Dhrystone            01/01/70 00:00      
                        give data            01/01/70 00:00      
                  I find it useful...            01/01/70 00:00      
                     Nonsense            01/01/70 00:00      
                        Nice attitude...            01/01/70 00:00      
                        One thing that would be useful for FPGA            01/01/70 00:00      
                           Still waiting            01/01/70 00:00      
                              Here it is ... It's simple arithmetic            01/01/70 00:00      
                                 Not at all!            01/01/70 00:00      
                                 You missed the "at the same frequency" part            01/01/70 00:00      
                                    You're right, in a sense ...            01/01/70 00:00      
                                       Still thinking of the DT8051 as 12-clocker            01/01/70 00:00      
                                          Gee ... I can see where I went off the track!            01/01/70 00:00      
                                             You deserve respect for that...            01/01/70 00:00      
                                             Very easy to miss things            01/01/70 00:00      
                                                It is a shame the documentation is so superficial            01/01/70 00:00      
                                             Marketing demagogy            01/01/70 00:00      
                                                baloney            01/01/70 00:00      
                                                   Insignificant?            01/01/70 00:00      
                                                      the "classical" timing            01/01/70 00:00      
                                                         Fair claim            01/01/70 00:00      
                                                Not so fast, there, Pilgrim...            01/01/70 00:00      
                                                   Any alternative?            01/01/70 00:00      
                                                      Possibly ... ???            01/01/70 00:00      
                                                         Still pipelining            01/01/70 00:00      
                                                            It doesn't have to pipeline            01/01/70 00:00      
                                                               What use?            01/01/70 00:00      
                                                                  if critical, lock - if you can            01/01/70 00:00      
                                                                     What question?            01/01/70 00:00      
                                                                        Whatever happened to Amit Mittal ?            01/01/70 00:00      
                                                                           maximum speed of a car            01/01/70 00:00      
                                                                           Pigeon Poster?            01/01/70 00:00      
                                                                        no question, uncernity            01/01/70 00:00      
                                                                  It's not that difficult ...            01/01/70 00:00      
                                                                     Are we talking about the same thing?            01/01/70 00:00      
                                                                        It is a matter of how you choose to view things            01/01/70 00:00      
                                                                           Q still open: any 8051 with only two clock transitions?            01/01/70 00:00      
                                                                              I do not believe bigger is better ...            01/01/70 00:00      
                                                                                 You argue quite much for not caring            01/01/70 00:00      
                                                                                    Without going into too much detail ...            01/01/70 00:00      
                                                                                       Pipeline for concurrency            01/01/70 00:00      
                                                                                          One step at a time            01/01/70 00:00      
                                                                                             Many steps at the same time            01/01/70 00:00      
                                                                              1-clocker without pipelining            01/01/70 00:00      
                                                                                 Interesting link - I just wish it was a bit meatier            01/01/70 00:00      
   what the datasheet for the particular device states            01/01/70 00:00      

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