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???
05/18/06 14:44
Modified:
  05/18/06 14:46
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 		 #116507 - no cache, but prefetch
Responding to: ???'s previous message
There is no real code cache, but a prefetch mechanism; plus a so called branch target (or jump) cache, attempting to minimize stalls at jumps. It is the same mechanism as you mention above for other mcu-s, so the '51 here effectively does run straight out of FLASH - the prefetch is effectively the mechanism of "dividing" the wide data bus.

The FLASH is 4 bytes (32 bits) wide.

The details in the "Branch target cache" chapter of the datasheet.

The same is in the faster uPSDs.

Jan Waclawek


List of 35 messages in thread
TopicAuthorDate
8052 overclocking            01/01/70 00:00      
   The absolutely complete answer is            01/01/70 00:00      
      its a definate maybe            01/01/70 00:00      
      Ideas...            01/01/70 00:00      
   Guarantees            01/01/70 00:00      
      i think Jeroen is an amateur            01/01/70 00:00      
   Even PC Overclockers know....            01/01/70 00:00      
      but PC overclockers also know            01/01/70 00:00      
         buying a 40MHz XTAL?            01/01/70 00:00      
         So get a faster one.            01/01/70 00:00      
         no need for overclocking !            01/01/70 00:00      
            more global            01/01/70 00:00      
            how to program            01/01/70 00:00      
               on programming tools, clocks and other            01/01/70 00:00      
               bootloader devices            01/01/70 00:00      
                  don't forget the Dallas devices            01/01/70 00:00      
         that's not quite true ... sadly enough            01/01/70 00:00      
   Entertaiment            01/01/70 00:00      
      Can you post that schematic?            01/01/70 00:00      
      How much performance did you squeeze out            01/01/70 00:00      
   Over-52-ing            01/01/70 00:00      
      yes well critical paths            01/01/70 00:00      
      Flash is a little slow...            01/01/70 00:00      
         well, it "is" possible            01/01/70 00:00      
            wide/interleaved FLASH            01/01/70 00:00      
               caching            01/01/70 00:00      
                  no cache, but prefetch            01/01/70 00:00      
                     the difference            01/01/70 00:00      
                        this is how your childhood is dying            01/01/70 00:00      
                           the 2 meanings            01/01/70 00:00      
   many devices do not need a "programming            01/01/70 00:00      
   Re: 8051 o/clock...            01/01/70 00:00      
      gobbelygook            01/01/70 00:00      
         working like crazy :-)))            01/01/70 00:00      
            I under clocked once...            01/01/70 00:00      

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