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???
01/17/09 05:38
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 		 #161575 - It's a core, intended for FPGA, not a chip.
Responding to: ???'s previous message
Andy Neil said:
At least with SFR space, you don't have the overhead of loading the DPTR...

Richard Erlacher said:
Further, some instructions can be executed concurrently or even out of order, if you're inclined to fiddle with the logic.


Sounds a bit advanced given the reason for the original post:

Christian Meier said:
we don´t know how to push the signal "ext_ram_en" to "1". (Signal in 8052.vhd)


It would take just about as much fiddling to put the CAN controller in external memory space, given that it's going to be in FPGA either way, as it would to put it in SFR space.

How much fiddling they do depends on their level of industry. If they just want to "get by" they'll modify the core as little as possible. If they want a really good grade, well, they'll do more.

I simply pointed out that they don't have to figure out how to make external memory space work, and, since the SFR space is already enabled ... well ... you get the idea.

RE


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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