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???
01/17/09 23:08
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 		 #161589 - XDATA access vs SFR access
Responding to: ???'s previous message
Christian Meier said:
the KEIL-compiler should use the right instructions and convert our code correctly into assembly code?

Of course - that is its job, isn't it!

But code to access XDATA will always required more instructions than code to access SFRs - because of the added requirement to load the DPTR.

So why would you burden the users of this system with such an overhead with no reason?

List of 30 messages in thread
TopicAuthorDate
[8052] Connect periphery over the XRAM Port            01/01/70 00:00      
   plus            01/01/70 00:00      
   Which Spartan-3E board?            01/01/70 00:00      
      SFR Space            01/01/70 00:00      
         Is that really the case in this instance?            01/01/70 00:00      
            I s'pose            01/01/70 00:00      
               It's a core, intended for FPGA, not a chip.            01/01/70 00:00      
   Thanks            01/01/70 00:00      
      Why go through all the suffering?            01/01/70 00:00      
      XDATA access vs SFR access            01/01/70 00:00      
         Perhaps they're in over their heads            01/01/70 00:00      
            Having fun?            01/01/70 00:00      
               Not exactly ...            01/01/70 00:00      
                  Talk to the OP, not about            01/01/70 00:00      
                     I would bet they've seen the light            01/01/70 00:00      
                        So whatever happened to...            01/01/70 00:00      
                           Ironic, isn't it?            01/01/70 00:00      
                              My point exactly!            01/01/70 00:00      
                                 Perhaps the O/P wasn't prepared            01/01/70 00:00      
                                    Yeah you´re (sometimes) right            01/01/70 00:00      
                                       It's about using what's already there            01/01/70 00:00      
                                          in the end            01/01/70 00:00      
                                             It doesn't always work in that way            01/01/70 00:00      
                                          Running before you can walk            01/01/70 00:00      
                                             Maybe, but first of all, there's no example ...            01/01/70 00:00      
                                                not really            01/01/70 00:00      
                                                   WTF???            01/01/70 00:00      
                                                   Let us not go over the top            01/01/70 00:00      
                                                      Language barrier?            01/01/70 00:00      
                                                         No ... I was agreeing with your comment            01/01/70 00:00      

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